Fastening fittings, fastening structure for steel members, and fastening method for steel members

Abstract

To provide a binding fitting capable of shortening a construction time, reducing noise in construction, and sufficiently securing binding force.SOLUTION: A binding fitting 1 for binding together steel members in which through holes 92 are formed, has: a penetrating portion 2 capable of penetrating through holes 92-1 and 92-2 formed in adjacent steel members 9-1 and 9-2; and a first locking portion 3 having a head 30 capable of being screwed to one end side of the penetrating portion 2, and an enlarged diameter portion 31 disposed between the head 30 and the steel member 9-2 and having a diameter larger than that of the through hole 92. The penetrating portion 2 has: a threaded portion 29 to which the head 30 is screwed on one end side; and a second locking portion 22 extending orthogonally to the threaded portion 29. The second locking portion 22 has: a first extending portion 23 connected from the threaded portion 29; and a second extending portion 24 bent and extending from the first extending portion 23 in an in-plane direction orthogonal to an extending direction of the threaded portion 29.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a fastening fitting, a fastening structure for steel members, and a fastening method for steel members. [Background technology]

[0002] Structures are constructed by connecting steel members such as liner plates and corrugated steel plates to each other. For example, multiple liner plates are connected to each other to be used as retaining walls when constructing caisson piles, drainage wells, underwater cofferdams, bridge piers, etc. For example, multiple corrugated steel plates are connected to each other to be used as waterways.

[0003] Steel members such as liner plates are connected to adjacent steel members in sequence to form a cylindrical or U-shaped structure. Typically, when connecting these steel members, adjacent steel members are bolted together. However, in the case of bolted connections, the bolts are inserted into the corrugated steel plate and then nuts are screwed onto them. This poses the problem of time-consuming installation, as it takes time to screw the nuts onto the bolts.

[0004] Conventionally, the techniques disclosed in Patent Documents 1 and 2 have been proposed with the aim of simplifying the work of connecting liner plates together.

[0005] The liner plate fastening fittings disclosed in Patent Document 1 are characterized by comprising an insertion portion that is inserted into the holes of each of the contacting flanges of the upper and lower liner plates, and a clamping portion that clamps the two contacting flanges.

[0006] The temporary fastening device for liner plates disclosed in Patent Document 2 consists of an insertion portion that is inserted into the holes in both flanges of the upper and lower liner plates that are in contact, a clamping portion with slits spaced apart to allow the two flanges to be inserted, and a connecting portion that connects the insertion portion and the clamping portion, and is characterized by being bent in a ``U'' shape from the connecting portion to the clamping portion. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Utility Model Application Publication No. 3-69093 [Patent Document 2] Japanese Utility Model Application Publication No. 2-125095 Summary of the Invention [Problem to be solved by the invention]

[0008] However, in the technologies disclosed in Patent Documents 1 and 2, when clamping the flanges in the clamping portion or removing them from the liner plate, it is necessary to strike them with a dedicated tool or a striking means such as a hammer. This poses the problem of generating noise. Also, in the technologies disclosed in Patent Documents 1 and 2, the flanges are simply clamped together and fixed, so the force used to fix the flanges together is relatively weak.

[0009] The present invention was devised in consideration of the above-mentioned problems, and its object is to provide a fastening fitting, a fastening structure for steel members, and a fastening method for steel members that can shorten construction time, reduce noise during construction, and ensure sufficient fastening force. [Means for solving the problem]

[0010] The fastening fitting according to the present invention is a fastening fitting for fastening together steel members having through holes formed therein, and comprises a through portion that can pass through each of the through holes formed in adjacent steel members, a head that can be screwed onto one end of the through portion, and a first locking portion that has an enlarged diameter portion that is arranged between the head and the steel member and is formed to have a diameter larger than that of the through hole, the through portion having a threaded portion at one end into which the head is screwed, and a second locking portion that extends perpendicular to the threaded portion, the first locking portion and the second locking portion sandwiching the adjacent steel members together for fastening, the second locking portion having a first extension portion connected to the threaded portion and a second extension portion that bends and extends from the first extension portion in an in-plane direction perpendicular to the extension direction of the threaded portion, the first extension portion and the second extension portion being The direction of extension of the screw portion is the normal line. It is characterized in that it extends within the same plane, and in the extension direction of the second extension portion, the length of the second extension portion from a plane passing through the axis of the screw portion is less than the length from the axis of the screw portion to the periphery of the enlarged diameter portion.

[0011] The fastening structure for steel members according to the present invention is a fastening structure for steel members fastening together steel members having through holes formed therein, and comprises a first steel member having a first through hole formed therein, a second steel member adjacent to the first steel member having a second through hole formed therein, and fastening fittings for fastening together the first steel member and the second steel member, the fastening fittings comprising a through portion that passes through the first through hole and the second through hole, a head portion provided on one end side of the through portion, and a fastening member that is disposed between the head portion and the first steel member and is spaced apart from the first through hole. The through portion has a threaded portion at one end into which the head is screwed, and a second locking portion extending perpendicular to the threaded portion, and the first locking portion and the second locking portion sandwich and fasten the adjacent first steel member and second steel member together, and the second locking portion has a first extension portion connected to the threaded portion, and a second extension portion that bends and extends from the first extension portion in an in-plane direction perpendicular to the extension direction of the threaded portion, and the first extension portion and the second extension portion are The direction of extension of the screw portion is the normal line.It is characterized in that it extends within the same plane, and in the extension direction of the second extension portion, the length of the second extension portion from a plane passing through the axis of the screw portion is less than the length from the axis of the screw portion to the periphery of the enlarged diameter portion.

[0012] The method for fastening steel members according to the present invention is a method for fastening steel members having through holes formed therein, and comprises a through portion that passes through a first through hole formed in a first steel member and a second through hole formed in a second steel member adjacent to the first steel member, a first locking portion having a head that can be screwed onto one end of the through portion and an expanded portion formed with a diameter larger than that of the first through hole, the through portion having a threaded portion at one end into which the head is screwed, and a second locking portion that extends perpendicular to the threaded portion, the second locking portion having a first extension portion connected to the threaded portion and an expanded portion extending in the direction of the extension of the threaded portion a penetration step in which the head is threadedly engaged with the threaded portion in advance using a fastening fitting having a second extension portion that bends and extends from the first extension portion in an in-plane direction perpendicular to the direction perpendicular to the screw direction, and the second locking portion is passed through the first through hole and the second through hole from the other end side of the through hole, thereby arranging the first steel member and the second steel member between the first locking portion and the second locking portion; and a fastening step in which the head is further threadedly engaged with the threaded portion, thereby sandwiching and fastening the first steel member and the second steel member between the first locking portion and the second locking portion, The direction of extension of the screw portion is the normal line. It is characterized in that it extends within the same plane, and in the extension direction of the second extension portion, the length of the second extension portion from a plane passing through the axis of the screw portion is less than the length from the axis of the screw portion to the periphery of the enlarged diameter portion. [Effects of the Invention]

[0013] According to the present invention, it is possible to shorten the construction time, reduce noise during construction, and ensure sufficient fastening force. [Brief explanation of the drawings]

[0014] [Figure 1]FIG. 1 is a perspective view showing a first example of a fastened structure of steel members according to the first embodiment. [Figure 2] FIG. 2(a) is a front view showing a first example of the fastened structure of steel members according to the first embodiment, and FIG. 2(b) is a side view thereof. [Figure 3] FIG. 3(a) is a side view showing a first example of the fastening fitting according to the first embodiment, and FIG. 3(b) is a plan view thereof. [Figure 4] FIG. 4(a) is a front view showing a state before the penetration portion is penetrated from the other end side in the penetration step of the method for fastening steel members, and FIG. 4(b) is a side view thereof. [Figure 5] Figure 5(a) is a front view showing the state before the liner plate is clamped and fastened between the first and second locking portions in the fastening method, and Figure 5(b) is a front view showing the state after the liner plate has been clamped and fastened between the first and second locking portions in the fastening method. [Figure 6] FIG. 6(a) is a front view showing a second example of the fastening fitting according to the first embodiment, and FIG. 6(b) is a side view thereof. [Figure 7] FIG. 7(a) is a front view showing a second example of the fastened structure of steel members according to the first embodiment, and FIG. 7(b) is a side view thereof. [Figure 8] FIG. 8 is a perspective view showing an example of a fastened structure of steel members according to the second embodiment. [Figure 9] FIG. 9(a) is a front view showing an example of a fastened structure of steel members according to the second embodiment, and FIG. 9(b) is a side view thereof. [Figure 10] FIG. 10(a) is a front view showing a state before the penetration portion is penetrated from the other end side in the penetration step of the method for fastening steel members, and FIG. 10(b) is a side view thereof. [Figure 11] Figure 11(a) is a front view showing the state before the steel members are clamped and fastened by the first locking portion and the second locking portion in the fastening method, and Figure 11(b) is a front view showing the state after the steel members have been clamped and fastened by the first locking portion and the second locking portion in the fastening method. [Figure 12]FIG. 12 is a front view showing a state in which the axis of the threaded portion is tilted during fastening. [Figure 13] Figure 13(a) is a front view showing the state before the liner plate is clamped and fastened between the first and second locking portions in the fastening method for the first example of the third embodiment, and Figure 13(b) is a front view showing the state after the liner plate has been clamped and fastened between the first and second locking portions in the fastening method for the first example of the third embodiment. [Figure 14] Figure 14(a) is a front view showing the state before the liner plate is clamped and fastened between the first and second locking portions in the fastening method for the second example of the third embodiment, and Figure 14(b) is a front view showing the state after the liner plate has been clamped and fastened between the first and second locking portions in the fastening method for the second example of the third embodiment. [Figure 15] Figure 15(a) is a front view showing the state before the liner plate is clamped and fastened between the first and second locking portions in the fastening method for the first example of the fourth embodiment, and Figure 15(b) is a front view showing the state after the liner plate has been clamped and fastened between the first and second locking portions in the fastening method for the first example of the fourth embodiment. [Figure 16] Figure 16(a) is a front view showing the state before the liner plate is clamped and fastened between the first and second locking portions in the fastening method for the second example of the fourth embodiment, and Figure 16(b) is a front view showing the state after the liner plate has been clamped and fastened between the first and second locking portions in the fastening method for the second example of the fourth embodiment. [Figure 17] FIG. 17 is a perspective view showing an example of a fastened structure of steel members according to the fifth embodiment. [Figure 18] FIG. 18(a) is a side view showing an example of a fastened structure of steel members according to the fifth embodiment, and FIG. 18(b) is a bottom view thereof. [Figure 19] FIG. 19 is a side view showing a state before the penetration portion is penetrated from the other end side in the penetration step in the method for fastening steel members. [Figure 20]Figure 20(a) is a side view showing the state before the steel members are clamped and fastened by the first locking portion and the second locking portion in the fastening method, and Figure 20(b) is a side view showing the state after the steel members have been clamped and fastened by the first locking portion and the second locking portion in the fastening method. DETAILED DESCRIPTION OF THE INVENTION

[0015] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments for carrying out a fastening fitting, a fastening structure for steel members, and a fastening method for steel members to which the present invention is applied will be described in detail with reference to the drawings.

[0016] (First embodiment) Fig. 1 is a perspective view showing a first example of a fastening structure 100 for steel members according to the first embodiment. Fig. 2(a) is a front view showing the first example of the fastening structure 100 for steel members according to the first embodiment, and Fig. 2(b) is a side view thereof. Fig. 3(a) is a side view showing the first example of the fastening fitting 1 according to the first embodiment, and Fig. 3(b) is a plan view thereof.

[0017] In the steel member fastening structure 100, liner plates 9 are used as the steel members. The steel member fastening structure 100 fastens together liner plates 9 each having a flange 91 formed with a through hole 92.

[0018] The liner plate 9 is constructed in a cylindrical shape by being fastened to other adjacent liner plates 9. The cylindrical liner plates 9 are installed inside shafts or on the ground, and are used as retaining walls when constructing deep foundation piles, drainage wells, underwater cofferdams, bridge piers, etc.

[0019] The liner plate 9 has a corrugated steel plate formed into a corrugated shape in the vertical direction, and flanges 91 at the upper end, lower end and both side ends of the corrugated steel plate. The flanges 91 have through holes 92 formed therein.

[0020] When the flanges 91 at the upper and lower ends of the corrugated steel plate of the liner plate 9 are circumferential flanges and the flanges 91 at both ends of the corrugated steel plate are axial flanges, the fastening structure 100 for steel members may be one in which the circumferential flanges are fastened to each other to fasten adjacent liner plates in the vertical direction. Also, the fastening structure 100 for steel members may be one in which the axial flanges are fastened to each other to fasten adjacent liner plates in the laterally direction.

[0021] The fastening structure 100 for steel members comprises a first liner plate 9-1, a second liner plate 9-2, and a fastening fitting 1.

[0022] The first liner plate 9-1 has a first flange 91-1 in which a first through-hole 92-1 is formed. The second liner plate 9-2 is adjacent to the first liner plate 9-1 and has a second flange 91-2 in which a second through-hole 92-2 is formed.

[0023] The fastening fitting 1 is for fastening the first liner plate 9-1 and the second liner plate 9-2 together. The fastening fitting 1 includes a penetration portion 2 and a first locking portion 3.

[0024] A rod-like member made of steel or the like and formed into a cylindrical shape or the like is used for the through-hole 2. The through-hole 2 passes through a first through-hole 92-1 and a second through-hole 92-2. The through-hole 2 has a first locking portion 3 screwed onto one end 2a side.

[0025] The through portion 2 is formed by bending a rod-shaped member at least multiple times. The through portion 2 has a threaded portion 29 on one end 2a side into which the first locking portion 3 is threaded, and a second locking portion 22 extending perpendicular to the threaded portion 29. The threaded portion 29 has a cylindrical outer surface on which a thread or a screw groove into which the first locking portion 3 can be threaded is formed. The through portion 2 may be formed, for example, by bending. The through portion 2 may be formed by forging, casting, or the like. The through portion 2 may be formed by joining three rod-shaped members by welding or the like. Here, "orthogonal" does not mean strictly 90°, but includes a manufacturing error of, for example, about ±3°.

[0026] The through portion 2 has a curved corner that connects the threaded portion 29 and the second locking portion 22, and the threaded portion 29 and the second locking portion 22 are arranged perpendicular to each other. An imaginary plane that runs along the threaded portion 29 and the second locking portion 22 is referred to as a first curved plane L1. An imaginary plane that runs along a first extension portion 23 and a second extension portion 24, which will be described later, is referred to as a second curved plane L2.

[0027] The through portion 2 has a second locking portion 22 on the other end 2b side of the through portion 2. The second locking portion 22 is formed parallel to the second flange 91-2. The second locking portion 22 is formed, for example, in a cylindrical shape, but may also be formed in a prismatic shape such as a square prism or a hexagonal prism.

[0028] The second locking portion 22 extends perpendicular to the threaded portion 29 and is formed in an L-shape. The second locking portion 22 has a first extension portion 23 connected to the threaded portion 29 and a second extension portion 24 bent from the first extension portion 23 in an in-plane direction perpendicular to the extension direction of the threaded portion 29. The second locking portion 22 may be formed by bending a rod-shaped member into an L-shape along the second curved plane L2, so that the first extension portion 23 and the second extension portion 24 are formed. One end of the first extension portion 23 is connected to the threaded portion 29 and extends perpendicular to the threaded portion 29. The other end of the first extension portion 23 is connected to the second extension portion 24. The second extension portion 24 is formed to be longer than the radius of the second through hole 92-2. The second extension portion 24 is preferably perpendicular to the first extension portion 23, but does not have to be perpendicular as long as it is bent.

[0029] The first locking portion 3 is provided by being screwed into the threaded portion 29 on one end 2a side of the through portion 2. The first locking portion 3 is formed to have a larger diameter than the first through hole 92-1 and the second through hole 92-2. The first locking portion 3 is preferably formed with at least two sides parallel to each other, and is formed in the shape of a rectangular pillar such as a hexagonal pillar.

[0030] The first locking portion 3 and the second locking portion 22 sandwich the first flange 91-1 and the second flange 91-2 and fasten them together. The first locking portion 3 abuts against the first flange 91-1, and the second locking portion 22 abuts against the second flange 91-2. Alternatively, the first locking portion 3 may abut against the second flange 91-2, and the second locking portion 22 may abut against the first flange 91-1.

[0031] The first locking portion 3 is, for example, a flanged nut, and has a head portion 30 as a nut and an enlarged diameter portion 31 as a flange formed with a larger diameter than the head portion 30. That is, the first locking portion 3 has the head portion 30 and the enlarged diameter portion 31 integrated together. Since the first locking portion 3 can be threaded onto the threaded portion 29, the distance H1 between the first locking portion 3 and the second locking portion 22 can be adjusted as needed. The enlarged diameter portion 31 is a flange portion attached to the lower part of the nut and serves the same function as a washer. Instead of a flanged nut, the first locking portion 3 may be one in which the head portion 30 as a nut and the enlarged diameter portion 31 as a washer are integrated by welding or the like. Note that the first locking portion 3 may be configured so that the head portion 30 and the enlarged diameter portion 31 are separable.

[0032] Next, a method for fastening steel members will be described. The method for connecting steel members fastens liner plates 9 having through holes 92 formed in flanges 91 together, and fastening fittings 1 are used. The method for fastening steel members includes a penetration step and a fastening step. In the method for fastening steel members, the first through hole 92-1 and the second through hole 92-2 are aligned opposite each other in advance.

[0033] FIG. 4(a) is a front view showing the state before the penetration portion 2 is penetrated from the other end 2b side in the penetration step of the method for fastening steel members, and FIG. 4(b) is a side view thereof.

[0034] In the penetration process, the first locking portion 3 is screwed into one end 2a of the penetration portion 2 in advance so that the distance H1 from the first locking portion 3 to the second locking portion 22 is greater than the sum of the thickness t1 of the first flange 91-1 and the thickness t2 of the second flange 91-2.

[0035] Then, in the passing step, the passing portion 2 is passed through the first through hole 92-1 and the second through hole 92-2 from the other end 2b side. At this time, in the passing step, the passing portion 2 is passed through so that the first curved surface L falls within the range of the width of the flange 91.

[0036] 5(a) is a front view showing the state before fastening by sandwiching the liner plate between the first locking portion 3 and the second locking portion 22 in the fastening method. Then, in the penetration step, the liner plate is rotated in a direction along the first curved surface L, so that the penetration portion 2 penetrates the first through hole 92-1 and the second through hole 92-2, and the first flange 91-1 and the second flange 91-2 are disposed between the first locking portion 3 and the second locking portion 22.

[0037] At this time, since the distance H1 from the first locking portion 3 to the second locking portion 22 is greater than the sum of the thickness t1 of the first flange 91-1 and the thickness t2 of the second flange 91-2, during the penetration process, the first locking portion 3 is locked to the first flange 91-1, and the second locking portion 22 is separated from the second flange 91-2.

[0038] Furthermore, when the difference Δh between the distance H1 from the first locking portion 3 to the second locking portion 22 and the sum of the thickness t1 of the first flange 91-1 and the thickness t2 of the second flange 91-2 is taken as the height h1 of the first locking portion 3, it is preferable that the difference Δh is smaller than the height h1 of the first locking portion 3.

[0039] 5(b) is a front view showing the state after the liner plate has been clamped and fastened between the first locking portion 3 and the second locking portion 22 in the fastening method. In the fastening process, the first locking portion 3 is screwed into the threaded portion 29 formed on one end 2a of the penetration portion 2. As a result, as shown in FIG. 5(b), the second locking portion 22, which has been separated from the second flange 91-2, approaches the second flange 91-2, and the distance H1 from the first locking portion 3 to the second locking portion 22 gradually decreases, so that the first flange 91-1 and the second flange 91-2 are clamped and fastened between the first locking portion 3 and the second locking portion 22. At this time, the first extension portion 23 and the second extension portion 24 come into contact with the second flange 91-2.

[0040] In the fastening step, when threading the first locking portion 3 onto the threaded portion 29, the first locking portion 3 may be clamped with a predetermined clamping means such as a wrench, and the threaded portion 29 may be rotated with an impact wrench or the like relative to the clamped first locking portion 3, thereby threading the head 30 of the first locking portion 3 onto the threaded portion 29. Furthermore, in the fastening step, when threading the head 30 of the first locking portion 3 onto the threaded portion 29, the through portion 2 may be held with a splint or the like, and the head 30 of the first locking portion 3 may be rotated relative to the threaded portion 29, thereby threading the first locking portion 3 onto the threaded portion 29. By clamping at least one of the first locking portion 3 and the through portion 2 in this manner, co-rotation of the first locking portion 3 and the threaded portion 29 can be prevented.

[0041] Furthermore, in the fastening process, when rotating the head 30 of the first locking portion 3 relative to the threaded portion 29, it is preferable to abut the other end 2b of the penetrating portion 2 against the second liner plate 9-2, and then rotate the first locking portion 3 relative to the threaded portion 29. This prevents the other end 2b abutting against the steel member from rotating. This makes it possible to prevent the first locking portion 3 and the threaded portion 29 from rotating together.

[0042] In this manner, in the fastening step, the first liner plate 9-1 and the second liner plate 9-2 are sandwiched between the first locking portion 3 and the second locking portion 22 and fastened together.

[0043] This completes the method for fastening the liner plates.

[0044] In the method for fastening liner plates, a plurality of fastening fittings 1 may be used, and the penetration step may be carried out sequentially for each fastening fitting 1, and then the fastening step may be carried out all at once for each fastening fitting 1 that has completed the penetration step. Also, in the method for fastening liner plates, a plurality of fastening fittings 1 may be used, and the penetration step and fastening step may be carried out repeatedly for each fastening fitting 1.

[0045] According to this embodiment, the head 30 of the first locking portion 3 is screwed into the threaded portion 29 formed on one end 2a of the through portion 2. This allows the first locking portion 3 and the second locking portion 22 to sandwich and fasten the first flange 91-1 and the second flange 91-2 together regardless of the thickness of the first flange 91-1 and the second flange 91-2. This allows for increased versatility.

[0046] Furthermore, according to this embodiment, the head 30 of the first locking portion 3 is screwed into the threaded portion 29 formed on one end 2a of the through portion 2. This allows the first locking portion 3 and the second locking portion 22 to be more firmly fastened together by sandwiching the first flange 91-1 and the second flange 91-2 between them. This makes it possible to ensure sufficient fastening force.

[0047] Furthermore, according to this embodiment, it is possible to eliminate the need for a dedicated jig or hammer or other striking means, which was previously required when clamping a clamping portion such as a metal fitting into a flange or removing it from a liner plate, thereby reducing noise during construction.

[0048] Here, if an external force acts on the fastened liner plates, causing deformation that spreads them apart, a fastener having only the first extension portion 23 may fall off the steel members, potentially causing brittle fracture at the ultimate load. In this regard, according to this embodiment, the second locking portion 22 has the first extension portion 23 connected to the threaded portion 29 and the second extension portion 24 that bends and extends from the first extension portion 23 in an in-plane direction perpendicular to the extension direction of the threaded portion 29. This allows the second extension portion 24 to remain locked to the liner plate, preventing the fastener 1 from falling off, even if an external force acts on the fastened liner plates, causing deformation that spreads them apart. This makes it possible to prevent brittle fracture at the ultimate load.

[0049] Furthermore, according to this embodiment, in the penetration step, the head 30 of the first locking portion 3 is threaded onto the threaded portion 29 in advance, and in the fastening step, the head 30 of the first locking portion 3 is further threaded onto the threaded portion 29, thereby clamping and fastening the first flange 91-1 and the second flange 91-2 between the first locking portion 3 and the second locking portion 22. This eliminates the need to screw nuts onto the bolts from scratch, which was necessary when joining liner plates together with conventional bolts. This makes it possible to shorten the construction time.

[0050] According to this embodiment, in the fastening step, the head 30 of the first locking portion 3 is further screwed onto the threaded portion 29, thereby sandwiching and fastening the first flange 91-1 and the second flange 91-2 between the first locking portion 3 and the second locking portion 22. This allows the first locking portion 3 and the second locking portion 22 to sandwich and fasten the first flange 91-1 and the second flange 91-2 regardless of the thickness of the first flange 91-1 and the second flange 91-2. This allows for increased versatility.

[0051] According to this embodiment, the second locking portion 22 can pass through the first through-hole 92-1 and the second through-hole 92-2. As a result, when the first liner plate 9-1 and the second liner plate 9-2 are fastened together, the fastening fitting 1 can be contained within the width of the flange 91 without protruding into the space formed inside the flange 91. This ensures the required design diameter for multiple liner plates 9 fastened together in a cylindrical shape, enabling construction costs to be reduced.

[0052] Furthermore, according to this embodiment, the difference Δh is smaller than the height h1 of the first locking portion 3. As a result, the distance required for the first locking portion 3 and the second locking portion 22 to sandwich and fasten the first flange 91-1 and the second flange 91-2 can be made smaller than the height h1 of the first locking portion 3. This makes it easier to sandwich and fasten the first flange 91-1 and the second flange 91-2 between the first locking portion 3 and the second locking portion 22, thereby enabling a reduction in installation time.

[0053] Furthermore, according to this embodiment, a plurality of fastening fittings 1 are used, and after the penetration process is performed on each fastening fitting 1, the fastening process is performed on each fastening fitting 1. This makes it possible to reduce the time required for changeover when fastening the fastening fittings 1 with an impact wrench or the like when fastening steel members using a plurality of fastening fittings 1. This makes it possible to significantly reduce construction time.

[0054] FIG. 6(a) is a front view showing a second example of the fastening fitting 1 according to the first embodiment, and FIG. 6(b) is a side view thereof.

[0055] In this fastening fitting 1, the corner of the through portion 2 connecting the threaded portion 29 and the second locking portion 22 is formed at a right angle, and the threaded portion 29 and the second locking portion 22 are arranged perpendicular to each other. Even in this case, the above-mentioned effects can be achieved.

[0056] FIG. 7(a) is a front view showing a second example of the fastened structure 100 for steel members according to the first embodiment, and FIG. 7(b) is a side view thereof.

[0057] The liner plate fastening structure 100 according to this example includes a first liner plate 9-1, a second liner plate 9-2, a fastening fitting 1, and a reinforcing ring 7.

[0058] The reinforcing ring 7 is provided between the first liner plate 9-1 and the second liner plate, and serves to reinforce the tightly joined liner plates. The reinforcing ring 7 is made of, for example, an H-shaped steel.

[0059] The reinforcing ring 7 has a reinforcing web 71 disposed between the first flange 91-1 and the second flange 91-2, and a pair of reinforcing flanges 72 provided at both ends of the reinforcing web 71. The reinforcing flanges 72 are disposed inside the inner end 91a of the flange 91.

[0060] As described above, according to this embodiment, the second locking portion 22 can pass through the first through-hole 92-1 and the second through-hole 92-2. This allows the fastening fitting 1 to be contained within the width of the flange 91 without protruding into the space formed inside the flange 91 when the first liner plate 9-1 and the second liner plate 9-2 are fastened together.

[0061] Therefore, a reinforcing ring 7 having a reinforcing flange 72 can be used on the inside of the liner plate 9 without being obstructed by the fastening fitting 1, and the fastened liner plate can be reinforced using the reinforcing ring 7.

[0062] (Second embodiment) Fig. 8 is a perspective view showing an example of a fastened structure 100 for steel members according to the second embodiment. Fig. 9(a) is a front view showing an example of the fastened structure 100 for steel members according to the second embodiment, and Fig. 9(b) is a side view thereof.

[0063] In the fastened structure 100 for steel members, corrugated steel plates 90 are used as the steel members. The fastened structure 100 for steel members fastens together corrugated steel plates 90 each having a through hole 92 formed at the end thereof.

[0064] The corrugated steel plate 90 is fastened to other adjacent corrugated steel plates 90 to form a U-shaped cross section or the like. The U-shaped corrugated steel plate 90 is placed on the ground or the like and used as a waterway or the like.

[0065] The corrugated steel sheet 90 is formed into a wave shape in which peaks 94 and valleys 95 are repeatedly formed, and through holes 92 are formed at the ends of the peaks 94. A plurality of corrugated steel sheets 90 are overlapped at their ends and fastened together with fastening fittings 1. Note that, in the second embodiment, a form in which the through holes 92 are formed in the peaks 94 will be described, but the through holes 92 may also be formed in the valleys 95 and fastened together with the fastening fittings 1.

[0066] The fastening structure 100 for steel members comprises a first corrugated steel plate 90-1, a second corrugated steel plate 90-2, and a fastening fitting 1.

[0067] Next, a method for fastening steel members will be described. The method for connecting steel members fastens corrugated steel plates 90 having through holes 92 formed therein, and fastening fittings 1 are used. The method for fastening steel members comprises a penetration step and a fastening step. In the method for fastening steel members, the first through hole 92-1 and the second through hole 92-2 are previously aligned opposite each other.

[0068] FIG. 10(a) is a front view showing the state before the penetration portion 2 is penetrated from the other end 2b side in the penetration step of the method for fastening steel members, and FIG. 10(b) is a side view thereof.

[0069] In the penetration process, the head 30 of the first engagement portion 3 is screwed into one end 2a of the penetration portion 2 in advance so that the distance H1 from the first engagement portion 3 to the second engagement portion 22 is greater than the sum of the thickness t1 of the first corrugated steel plate 90-1 and the thickness t2 of the second corrugated steel plate 90-2.

[0070] Then, in the penetration step, the penetration portion 2 is passed through the first through hole 92-1 and the second through hole 92-2 from the other end 2b side.

[0071] 11(a) is a front view showing the state before fastening by sandwiching between the first locking portion 3 and the second locking portion 22 in the fastening method for steel members. Then, in the passing step, the steel members are rotated in a direction along the first curved surface L, and the passing portion 2 is passed through the first through hole 92-1 and the second through hole 92-2, and the first corrugated steel plate 90-1 and the second corrugated steel plate 90-2 are arranged between the first locking portion 3 and the second locking portion 22.

[0072] At this time, since the distance H1 from the first locking portion 3 to the second locking portion 22 is greater than the sum of the thickness t1 of the first flange 91-1 and the thickness t2 of the second flange 91-2, during the penetration process, the first locking portion 3 is locked to the first corrugated steel plate 90-1, and the second locking portion 22 is separated from the second corrugated steel plate 90-2.

[0073] Furthermore, when the difference Δh between the distance H1 from the first engagement portion 3 to the second engagement portion 22 and the sum of the thickness t1 of the first corrugated steel plate 90-1 and the thickness t2 of the second corrugated steel plate 90-2 is taken as the height h1 of the first engagement portion 3, it is preferable that the difference Δh is smaller than the height h1 of the first engagement portion 3.

[0074] 11(b) is a front view showing the state after the steel members have been clamped and fastened by the first locking portion 3 and the second locking portion 22 in the fastening method. In the fastening process, the head 30 of the first locking portion 3 is screwed into the threaded portion 29 formed on one end 2a of the penetration portion 2. As a result, as shown in FIG. 11(b), the second locking portion 22, which has been separated from the second corrugated steel plate 90-2, approaches the second corrugated steel plate 90-2, and the distance H1 from the first locking portion 3 to the second locking portion 22 gradually decreases, so that the first corrugated steel plate 90-1 and the second corrugated steel plate 90-2 are clamped and fastened by the first locking portion 3 and the second locking portion 22.

[0075] In this manner, in the fastening step, the first corrugated steel plate 90-1 and the second corrugated steel plate 90-2 are sandwiched between the first locking portion 3 and the second locking portion 22 and fastened together.

[0076] According to this embodiment, the first locking portion 3 is screwed into a threaded portion 29 formed on one end 2a of the through portion 2. This allows the first locking portion 3 and the second locking portion 22 to sandwich and fasten the first corrugated steel plate 90-1 and the second corrugated steel plate 90-2 together, regardless of the thickness of the first corrugated steel plate 90-1 and the second corrugated steel plate 90-2. This makes it possible to increase versatility.

[0077] Furthermore, according to this embodiment, the first locking portion 3 is screwed into the threaded portion 29 formed on one end 2a of the through portion 2. This allows the first locking portion 3 and the second locking portion 22 to sandwich the first corrugated steel plate 90-1 and the second corrugated steel plate 90-2 and fasten them together more firmly. This makes it possible to ensure sufficient fastening force.

[0078] Furthermore, according to this embodiment, it is possible to eliminate the need for a dedicated jig or hammer or other striking means, which was previously required when clamping a clamping portion such as a metal fitting into a flange or removing it from a liner plate, thereby reducing noise during construction.

[0079] According to this embodiment, the second locking portion 22 has a first extension portion 23 connected to the threaded portion 29, and a second extension portion 24 that bends and extends from the first extension portion 23 in an in-plane direction perpendicular to the extension direction of the threaded portion 29. This allows the second extension portion 24 to maintain its locking state with the corrugated steel plates, preventing the fastening device 1 from falling off, even when an external force is applied and deformation occurs that causes the corrugated steel plates to open up. This makes it possible to prevent brittle fracture at the ultimate load.

[0080] Furthermore, according to this embodiment, in the penetration step, the first locking portion 3 is threaded onto the threaded portion 29 in advance, and in the fastening step, the first locking portion 3 is further threaded onto the threaded portion 29, thereby sandwiching and fastening the first corrugated steel plate 90-1 and the second corrugated steel plate 90-2 between the first locking portion 3 and the second locking portion 22. This eliminates the need to screw nuts onto bolts from scratch, which was necessary when joining corrugated steel plates together with conventional bolts. This makes it possible to shorten the construction time.

[0081] According to this embodiment, in the fastening step, the first locking portion 3 is further screwed onto the threaded portion 29, thereby sandwiching and fastening the first corrugated steel sheet 90-1 and the second corrugated steel sheet 90-2 between the first locking portion 3 and the second locking portion 22. This allows the first locking portion 3 and the second locking portion 22 to sandwich and fasten the first corrugated steel sheet 90-1 and the second corrugated steel sheet 90-2 regardless of the thickness of the first corrugated steel sheet 90-1 and the second corrugated steel sheet 90-2. This makes it possible to increase versatility.

[0082] Furthermore, according to this embodiment, the difference Δh is smaller than the height h1 of the first locking portion 3. As a result, the distance required for the first locking portion 3 and the second locking portion 22 to sandwich and fasten the first corrugated steel plate 90-1 and the second corrugated steel plate 90-2 can be made smaller than the height h1 of the first locking portion 3. This makes it easier to sandwich and fasten the first corrugated steel plate 90-1 and the second corrugated steel plate 90-2 between the first locking portion 3 and the second locking portion 22, thereby enabling a reduction in installation time.

[0083] Furthermore, according to this embodiment, the second through hole 92-2 is formed in the ridge portion 94 of the steel member. This allows the other end 2b of the through portion 2 to abut against the steel member, and then the first locking portion 3 can be rotated relative to the threaded portion 29. Therefore, the other end 2b abutting against the steel member cannot rotate, and co-rotation of the first locking portion 3 and the threaded portion 29 can be prevented.

[0084] According to this embodiment, the head 30 and the enlarged diameter portion 31 are integrated. This allows a longer distance from the axis C of the threaded portion 29 than when the head 30 and the enlarged diameter portion 31 are separated. This makes it possible to prevent the axis C of the threaded portion 29 from tilting, and to prevent a decrease in the degree of fixation between the first corrugated steel sheet 90-1 and the second corrugated steel sheet 90-2.

[0085] (Third embodiment) FIG. 12 is a front view showing a state in which the axis C of the threaded portion 29 is tilted during fastening. In the fastened state shown in FIG. 5(b), the second locking portion 22 is parallel to the second flange 91-2, enabling the first flange 91-1 and the second flange 91-2 to be firmly fastened together. However, if the fastening is further increased from the state shown in FIG. 5(b), the through-hole 2 may attempt to be pulled out excessively, causing the axis C of the threaded portion 29 to tilt, as shown in FIG. 13. This may undesirably reduce the degree of fastening between the first flange 91-1 and the second flange 91-2. When transitioning from the state shown in FIG. 5(b) to the state shown in FIG. 13, the contact point A1 between the second through-hole 92-2 and the orthogonal portion of the second locking portion 22 shown in FIG. 5(b) moves toward the other end 2b in FIG. 13 (contact point A1 → A1'). If this movement can be suppressed, the axis C of the threaded portion 29 will not tilt. In the following third and fourth embodiments, examples showing countermeasures will be described.

[0086] Fig. 13(a) is a front view showing a state before clamping and fastening by the first locking portion and the second locking portion in the method for fastening liner plates according to the first example of the third embodiment, Fig. 13(b) is a front view showing a state after clamping and fastening by the first locking portion and the second locking portion in the method for fastening liner plates according to the first example of the third embodiment, Fig. 14(a) is a front view showing a state before clamping and fastening by the first locking portion and the second locking portion in the method for fastening liner plates according to the second example of the third embodiment, and Fig. 14(b) is a front view showing a state after clamping and fastening by the first locking portion and the second locking portion in the method for fastening liner plates according to the second example of the third embodiment.

[0087] In the fastening fitting 1 according to the third embodiment, the second locking portion 22 has a first protrusion 25 that comes into contact with the second flange 91-2. The first protrusion 25 is preferably provided in a position close to the second through-hole 92-2 of the second flange 91-2.

[0088] 13, the first protrusion 25 is formed by thread cutting such as thread cutting. In this case, the through portion 2 may be, for example, a fully threaded bolt bent into an L shape.

[0089] 14, the penetrating portion 2 is formed by bending a straight rod-shaped member into an L-shape, and the first protrusion 25 is a protrusion formed on the inside of the bend by bending the rod-shaped member into an L-shape. The first protrusion 25 may be formed by attaching a protruding object such as a steel piece to the second engaging portion 22.

[0090] In the method for fastening steel members according to the third embodiment, in the penetration process, as shown in Figures 13(a) and 14(a), the member is rotated in a direction along the first curved surface L to pass the corner portion 28 of the penetration portion 2 through the first through hole 92-1 and the second through hole 92-2, and the first flange 91-1 and the second flange 91-2 are positioned between the first engaging portion 3 and the second engaging portion 22.

[0091] At this time, since the distance H1 from the first locking portion 3 to the second locking portion 22 is greater than the sum of the thickness t1 of the first flange 91-1 and the thickness t2 of the second flange 91-2, during the penetration process, the first locking portion 3 is locked to the first flange 91-1, and the first protrusion portion 25 of the second locking portion 22 is separated from the second flange 91-2.

[0092] Next, in the fastening step, the first locking portion 3 is screwed onto the threaded portion 29 formed on one end 2a of the through portion 2. As a result, as shown in FIGS. 13(b) and 14(b), the first protrusion 25 of the second locking portion 22, which has been separated from the second flange 91-2, approaches the second flange 91-2, and the distance H1 from the first locking portion 3 to the second locking portion 22 gradually decreases, so that the first flange 91-1 and the second flange 91-2 are sandwiched and fastened between the first locking portion 3 and the first protrusion 25 of the second locking portion 22. At this time, the first protrusion 25 can be forced to bite into the second flange 91-2.

[0093] According to this embodiment, the second locking portion 22 has a first protrusion 25 on a surface that comes into contact with the second flange 91-2. This allows the first protrusion 25 to bite into the second flange 91-2 when the first flange 91-1 and the second flange 91-2 are sandwiched and fastened between the first locking portion 3 and the first protrusion 25 of the second locking portion 22. This prevents the second locking portion 22 from shifting relative to the second flange 91-2. As a result, tilting of the axis C of the threaded portion 29 is prevented, and the first flange 91-1 and the second flange 91-2 can be firmly fixed together.

[0094] If the fastening fitting 1 is pulled out due to excessive fastening, the corners of the second through-holes 92-2 of the second flange 91-2 will receive the greatest contact force from the through-holes 2. In this regard, according to the present embodiment, the first protrusions 25 are provided in a position closest to the second through-holes 92-2 of the second flange 91-2. This effectively prevents the second locking portions 22 from shifting relative to the second flange 91-2. This prevents the axis C of the threaded portion 29 from tilting, further firmly fixing the first flange 91-1 and the second flange 91-2 together.

[0095] (Fourth embodiment) Fig. 15(a) is a front view showing a state before clamping and fastening by the first locking portion and the second locking portion in the method for fastening liner plates according to the first example of the fourth embodiment, Fig. 15(b) is a front view showing a state after clamping and fastening by the first locking portion and the second locking portion in the method for fastening liner plates according to the first example of the fourth embodiment, Fig. 16(a) is a front view showing a state before clamping and fastening by the first locking portion and the second locking portion in the method for fastening liner plates according to the second example of the fourth embodiment, and Fig. 16(b) is a front view showing a state after clamping and fastening by the first locking portion and the second locking portion in the method for fastening liner plates according to the second example of the fourth embodiment.

[0096] In the fastening fitting 1 according to the fourth embodiment, the second flange 91-2 has a second protrusion 96 that comes into contact with the second locking portion 22. The second protrusion 96 is preferably provided in a position close to the second through-hole 92-2 of the second flange 91-2.

[0097] As shown in FIG. 15, the second protrusion 96 is a protrusion formed on the circumferential edge of the second through-hole 92-2, and is formed by burring.

[0098] As shown in FIG. 16, the second protrusion 96 may be an annular body attached to the second flange 91-2 by welding or the like.

[0099] In the method for fastening steel members according to the fourth embodiment, in the penetration process, as shown in Figures 15(a) and 16(a), the member is rotated in a direction along the first curved surface L to pass the corner portion 28 of the penetration portion 2 through the first through hole 92-1 and the second through hole 92-2, and the first flange 91-1 and the second flange 91-2 are positioned between the first engaging portion 3 and the second engaging portion 22.

[0100] At this time, since the distance H1 from the first locking portion 3 to the second locking portion 22 is greater than the sum of the thickness t1 of the first flange 91-1 and the thickness t2 of the second flange 91-2, during the penetration process, the first locking portion 3 is locked to the first flange 91-1, and the second locking portion 22 is separated from the second flange 91-2.

[0101] Next, in the fastening step, the first locking portion 3 is screwed onto the threaded portion 29 formed on one end 2a of the through portion 2. As a result, as shown in FIGS. 15(b) and 16(b), the second locking portion 22, which has been separated from the second flange 91-2, approaches the second flange 91-2, and the distance H1 from the first locking portion 3 to the second locking portion 22 gradually decreases, so that the first flange 91-1 and the second protrusion 96 formed on the second flange 91-2 are sandwiched and fastened between the first locking portion 3 and the second locking portion 22. At this time, the second protrusion 96 can be forced to bite into the second locking portion 22.

[0102] According to this embodiment, the second corrugated steel plate 90-2 has a second protrusion 96 that comes into contact with the second locking portion 22. This allows the second protrusion 96 to bite into the second locking portion 22 when the first flange 91-1 and the second flange 91-2 are clamped and fastened between the first locking portion 3 and the second locking portion 22. This prevents the second locking portion 22 from shifting relative to the second flange 91-2 if the fastener 1 is pulled out due to excessive fastening, etc. As a result, tilting of the axis C of the threaded portion 29 is prevented, and the first flange 91-1 and the second flange 91-2 can be firmly fixed together.

[0103] If the fastening fitting 1 is pulled out due to excessive fastening or the like, the area near the corner of the second through-hole 92-2 of the second flange 91-2 will receive the greatest contact force from the through-hole 2. In this regard, according to the present embodiment, the second protrusion 96 is provided in a position closest to the second through-hole 92-2 of the second flange 91-2. This effectively prevents the second locking portion 22 from shifting relative to the second flange 91-2. This prevents the axis C of the threaded portion 29 from tilting, thereby more firmly fixing the first flange 91-1 and the second flange 91-2 together.

[0104] (Fifth embodiment) Next, a description will be given of a fastened structure 100 for steel members according to a fifth embodiment. Fig. 17 is a perspective view showing an example of the fastened structure 100 for steel members according to the fifth embodiment. Fig. 18(a) is a side view showing an example of the fastened structure 100 for steel members according to the fifth embodiment, and Fig. 18(b) is a bottom view thereof.

[0105] In this embodiment, a steel plate 8-1 is used as the first steel member, and a cylindrical support 8-2 is used as the second steel member. The fastening structure 100 for steel members fastens the steel plate 8-1 and the support 8-2 together.

[0106] The steel plate 8-1 is fastened to the adjacent support post 8-2. The steel plate 8-1 is bent so that the portion that contacts the support post 8-2 is curved. A second through-hole 82-2 is formed in the steel plate 8-1 at the portion that contacts the support post 8-2. Holes are formed on both ends of the steel plate 8-1, and connecting fittings are used through these holes to which fence panels for a protective fence or the like (not shown) can be connected.

[0107] The support 8-2 is formed in a cylindrical shape with a circular cross section or the like, and its lower end is fixed to the ground. The support 8-2 has a second through-hole 82-2 formed in its side wall, but no through-hole is formed in a position opposite the second through-hole 82-2.

[0108] The fastening structure 100 for steel members comprises a steel plate 8-1, a support 8-2, and a fastening fitting 1.

[0109] Next, a method for fastening steel members will be described. The method for connecting steel members fastens a steel plate 8-1 having a first through hole 82-1 formed therein to a support 8-2 having a second through hole 82-2 formed therein, and uses a fastening fitting 1. The method for fastening steel members comprises a penetration step and a fastening step. In the method for fastening steel members, the first through hole 82-1 and the second through hole 82-2 are previously aligned to face each other.

[0110] FIG. 19 is a side view showing a state before the penetration portion 2 is penetrated from the other end 2b side in the penetration step in the method for fastening steel members.

[0111] In the penetration process, the head 30 of the first engagement portion 3 is screwed into one end 2a of the penetration portion 2 in advance so that the distance H1 from the first engagement portion 3 to the second engagement portion 22 is greater than the sum of the thickness t1 of the steel plate 8-1 and the thickness t2 of the support 8-2.

[0112] Then, in the penetration step, the penetration portion 2 is passed through the first through hole 82-1 and the second through hole 82-2 from the other end 2b side.

[0113] 20(a) is a side view showing the state before fastening by sandwiching between the first locking portion 3 and the second locking portion 22 in the fastening method for steel members. Then, in the penetration step, the steel member is rotated in a direction along the first curved surface L, and the corner portion 28 of the penetration portion 2 is passed through the first through hole 82-1 and the second through hole 82-2, and the steel plate 8-1 and the support 8-2 are positioned between the first locking portion 3 and the second locking portion 22.

[0114] At this time, the distance H1 from the first locking portion 3 to the second locking portion 22 is greater than the sum of the thickness t1 of the steel plate 8-1 and the thickness t2 of the support pillar 8-2.

[0115] Furthermore, when the difference Δh between the distance H1 from the first engagement portion 3 to the second engagement portion 22 and the sum of the thickness t1 of the steel plate 8-1 and the thickness t2 of the support 8-2 is taken as the height h1 of the first engagement portion 3, it is preferable that the difference Δh is smaller than the height h1 of the first engagement portion 3.

[0116] Fig. 20(b) is a side view showing the state after the steel members have been clamped and fastened between the first locking portion 3 and the second locking portion 22 in the fastening method. In the fastening process, the head 30 of the first locking portion 3 is screwed into the threaded portion 29 formed on one end 2a of the penetration portion 2. As a result, as shown in Fig. 21(b), the distance H1 from the first locking portion 3 to the second locking portion 22 gradually decreases, and the steel plate 8-1 and the support 8-2 are clamped and fastened between the first locking portion 3 and the second locking portion 22.

[0117] In this manner, in the fastening step, the steel plate 8-1 and the support post 8-2 are sandwiched between the first fastening portion 3 and the second fastening portion 22 and fastened together.

[0118] According to this embodiment, the first locking portion 3 is screwed into a threaded portion 29 formed on one end 2a of the through portion 2. This allows the first locking portion 3 and the second locking portion 22 to sandwich and fasten the steel plate 8-1 and the support 8-2 together, regardless of the thickness of the steel plate 8-1 and the support 8-2. This makes it possible to increase versatility.

[0119] Furthermore, according to this embodiment, the first locking portion 3 is screwed into the threaded portion 29 formed on one end 2a of the through portion 2. This allows the first locking portion 3 and the second locking portion 22 to sandwich the steel plate 8-1 and the support 8-2 and fasten them together more firmly. This makes it possible to ensure sufficient fastening force.

[0120] According to this embodiment, the second locking portion 22 has a first extension portion 23 connected to the threaded portion 29, and a second extension portion 24 that bends and extends from the first extension portion 23 in an in-plane direction perpendicular to the extension direction of the threaded portion 29. This allows the second extension portion 24 to remain locked to the steel members, preventing the fastening device 1 from falling off, even when an external force is applied and deformation occurs that causes the steel members to open up.

[0121] Furthermore, according to this embodiment, in the penetration step, the first locking portion 3 is screwed onto the threaded portion 29 in advance, and in the fastening step, the first locking portion 3 is further screwed onto the threaded portion 29, thereby clamping and fastening the steel plate 8-1 and the support 8-2 between the first locking portion 3 and the second locking portion 22. This eliminates the need to screw nuts onto the bolts from scratch, which was necessary when joining a steel plate and a support with conventional bolts. This makes it possible to shorten the construction time.

[0122] Furthermore, according to this embodiment, the steel plate 8-1 and the support pillar 8-2 are fastened by being sandwiched between the first locking portion 3 and the second locking portion 22. Therefore, it is sufficient to form the second through-hole 82-2 in the cylindrical side wall of the support pillar 8-2; there is no need to form a through-hole in the position opposite the second through-hole 82-2. This eliminates the need for a through-bolt that penetrates the support pillar, which was previously required to fasten steel plates. This allows the construction work to be completed in a shorter time.

[0123] According to this embodiment, in the fastening step, the first locking portion 3 is further screwed onto the threaded portion 29, thereby sandwiching and fastening the steel plate 8-1 and the support pillar 8-2 between the first locking portion 3 and the second locking portion 22. This allows the first locking portion 3 and the second locking portion 22 to sandwich and fasten the steel plate 8-1 and the support pillar 8-2 regardless of the thickness of the steel plate 8-1 and the support pillar 8-2. This makes it possible to increase versatility.

[0124] Furthermore, according to this embodiment, the difference Δh is smaller than the height h1 of the first locking portion 3. As a result, the distance required for the first locking portion 3 and the second locking portion 22 to sandwich and fasten the steel plate 8-1 and the pillar 8-2 can be made smaller than the height h1 of the first locking portion 3. This makes it easier to sandwich and fasten the steel plate 8-1 and the pillar 8-2 between the first locking portion 3 and the second locking portion 22, thereby enabling a reduction in construction time.

[0125] Furthermore, according to this embodiment, the second through-hole 82-2 is formed in the cylindrical support 8-2. This allows the other end 2b of the through-hole 2 to abut against the inner surface of the support 8-2, and then the first locking portion 3 can be rotated relative to the threaded portion 29. As a result, the other end 2b abutting against the curved inner surface of the support 8-2 cannot rotate, and co-rotation of the first locking portion 3 and the threaded portion 29 can be prevented.

[0126] According to this embodiment, the head 30 and the expanded diameter portion 31 are integrated. This allows the distance from the axis C of the threaded portion 29 to be longer than when the head 30 and the expanded diameter portion 31 are separated. This makes it possible to prevent the axis C of the threaded portion 29 from tilting, and to prevent a decrease in the degree of fixation between the steel plate 8-1 and the support 8-2.

[0127] Although several embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. Furthermore, these embodiments can be implemented in various combinations as appropriate. Furthermore, the present invention can be implemented in various novel forms in addition to the several embodiments described above. Therefore, various omissions, substitutions, and modifications are possible in each of the several embodiments described above without departing from the spirit of the present invention. Such novel forms and modifications are included within the scope and spirit of the present invention, as well as within the scope of the inventions described in the claims and equivalents of the inventions described in the claims. [Explanation of symbols]

[0128] 100: Steel member fastening structure 1: Fastening hardware 2: Penetration 2a: One end 2b: Other end 22: Second locking portion 23: 1st extension part 24:Second stretching section 25: 1st protrusion 28: Corner 29: Threaded part 3: First locking part 30:Head 31: Expanded diameter part 7: Reinforcement ring 71: Reinforcement web 72: Reinforcement flange 8-1: Steel plate 82-1: First through hole 8-2: Strut 82-2: Second through hole 9: Liner plate 9-1: First liner plate 9-2: Second liner plate 91: Flange 91-1: First flange 91-2: Second flange 91a: Inner end 90: Corrugated steel plate 90-1: First corrugated steel plate 90-2: Second corrugated steel plate 92:Through hole 92-1: First through hole 92-2: Second through hole 94: Yamabe 95: Valley 96:Second protrusion

Claims

1. A fastening fitting for fastening steel members having through holes therein, a through-hole that can be inserted into each of the through-holes formed in the adjacent steel members; a first engaging portion having a head portion that can be screwed onto one end side of the through-hole, and an expanded diameter portion that is disposed between the head portion and the steel member and has a diameter larger than that of the through-hole, The through portion is a threaded portion on one end side into which the head is screwed; a second engaging portion extending perpendicular to the threaded portion, the first engaging portion and the second engaging portion sandwich and fasten the adjacent steel members together, the second engaging portion has a first extending portion connected to the threaded portion and a second extending portion bent and extending from the first extending portion in an in-plane direction perpendicular to the extending direction of the threaded portion, the first extension portion and the second extension portion extend in the same plane having a normal line in the extension direction of the thread portion, In the extension direction of the second extension portion, the length of the second extension portion from a plane passing through the axis of the threaded portion is equal to or less than the length from the axis of the threaded portion to the periphery of the enlarged diameter portion. A fastening fitting characterized by the above.

2. A fastening structure for steel members that fastens steel members having through holes therein, a first steel member in which a first through hole is formed; A second steel member adjacent to the first steel member, in which a second through hole is formed; a fastening fitting for fastening the first steel member and the second steel member, The fastening fitting is a through portion that passes through the first through hole and the second through hole; a first engaging portion having a head portion provided on one end side of the through portion, and an expanded diameter portion disposed between the head portion and the first steel member and formed to have a diameter larger than that of the first through hole; The through portion is a threaded portion on one end side into which the head is screwed; a second engaging portion extending perpendicular to the threaded portion, the first engaging portion and the second engaging portion sandwich and fasten the adjacent first steel member and the adjacent second steel member, the second engaging portion has a first extending portion connected to the threaded portion and a second extending portion bent and extending from the first extending portion in an in-plane direction perpendicular to the extending direction of the threaded portion, the first extension portion and the second extension portion extend in the same plane having a normal line in the extension direction of the thread portion, In the extension direction of the second extension portion, the length of the second extension portion from a plane passing through the axis of the threaded portion is equal to or less than the length from the axis of the threaded portion to the periphery of the enlarged diameter portion. A tightly connected structure of steel members characterized by the above.

3. The first steel member and the second steel member are liner plates having flanges in which the through holes are formed.

3. The steel member fastening structure according to claim 2, wherein:

4. The first steel member and the second steel member are corrugated steel plates.

3. The steel member fastening structure according to claim 2, wherein:

5. the first steel member is a steel plate, The second steel member is a column formed in a cylindrical shape.

3. The steel member fastening structure according to claim 2, wherein:

6. A method for fastening steel members having through holes, comprising: a through-hole formed in a first steel member and a second through-hole formed in a second steel member adjacent to the first steel member; a first engaging portion having a head portion that can be screwed onto one end side of the through-hole and an expanded diameter portion that is formed to have a diameter larger than that of the first through hole, The through portion is a threaded portion on one end side into which the head is screwed; a second engaging portion extending perpendicular to the threaded portion, The second engaging portion has a first extending portion connected to the threaded portion and a second extending portion that is bent and extends from the first extending portion in an in-plane direction perpendicular to the extending direction of the threaded portion, a penetration step in which the head is screwed onto the screw portion in advance, the second engaging portion is penetrated from the other end side of the penetration portion into the first through hole and the second through hole, and the first steel member and the second steel member are disposed between the first engaging portion and the second engaging portion; a fastening step of fastening the first steel member and the second steel member by further screwing the head portion into the threaded portion, and clamping the first steel member and the second steel member between the first engaging portion and the second engaging portion, the first extension portion and the second extension portion extend in the same plane having a normal line in the extension direction of the thread portion, In the extension direction of the second extension portion, the length of the second extension portion from a plane passing through the axis of the threaded portion is equal to or less than the length from the axis of the threaded portion to the periphery of the enlarged diameter portion. A method for fastening steel members, characterized by the above.

7. Using a plurality of the fastening fittings, the piercing step is performed for each of the fastening fittings, and then the fastening step is performed for each of the fastening fittings.

7. The method for fastening steel members according to claim 6, wherein:

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