Fastening fittings, fastening structures for steel members, and fastening methods for steel members

Abstract

The present invention provides fastening hardware that enables shortening of construction time, reduces noise during construction, and ensures sufficient fastening strength. [Solution] The fastening according to this embodiment is for fastening steel members having through holes 92, and comprises a first locking part 3 having a through part 2 that can pass through the respective through holes 92-1 and 92-2 formed in adjacent steel members 9-1 and 9-2, a head 30 that can be screwed onto one end of the through part 2, and an enlarged diameter part 31 that is positioned between the head 30 and the steel member 9-2 and is formed to be larger in diameter than the through hole 92, the through part 2 having a threaded part 29 into which the head 30 is screwed onto one end, and a second locking part 22 that extends perpendicular to the threaded part 29, the first locking part 3 and the second locking part 22 fasten adjacent steel members 9-1 and 9-2 by sandwiching them, and the head 30 and the enlarged diameter part 31 of the first locking part 3 are integrated.

Description

Technical Field

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

Background Art

[0002] Steel members such as liner plates and corrugated steel plates are connected to each other to construct a structure. For example, a plurality of liner plates are connected to each other and used as soil retaining when constructing deep foundation piles, sump wells, underwater temporary cutoffs, bridge piers, etc. For example, a plurality of corrugated steel plates are connected to each other and used as a water channel.

[0003] Steel members such as liner plates are sequentially connected to adjacent steel members and constructed in a cylindrical or U-shaped form. Usually, when connecting such steel members, adjacent steel members are bolted together. However, in the case of bolt connection, the bolt is passed through the corrugated steel plate and then the nut is screwed on. Therefore, it takes time to screw the nut onto the bolt, and there is a problem that the construction takes time.

[0004] Conventionally, for the purpose of easily performing the work of connecting liner plates to each other, the disclosed techniques of Patent Documents 1 and 2 have been proposed.

[0005] The fastening fitting for the liner plate disclosed in Patent Document 1 is characterized by comprising an insertion portion inserted into holes of respective flanges where upper and lower liner plates are in contact, and a clamping portion for clamping the two flanges in contact.

[0006] The temporary fixing tool for the liner plate disclosed in Patent Document 2 comprises an insertion portion inserted into holes of both flanges where upper and lower liner plates are in contact, a clamping portion provided with a slit having an interval into which the two flanges can be inserted, and a connecting portion connecting the insertion portion and the clamping portion, and is characterized in that it is folded in a "く" shape from the connecting portion to the clamping portion.

Prior Art Documents

Patent Documents

[0007] [Patent Document 1] Japanese Utility Model Publication No. 3-69093 [Patent Document 2] Japanese Utility Model Publication No. 2-125095 [Overview of the Initiative] [Problems that the invention aims to solve]

[0008] Incidentally, in the technologies disclosed in Patent Documents 1 and 2, when clamping the flanges with the clamping portion or removing them from the liner plate, it is necessary to strike them with a special jig or a hammer or other striking means. This has the problem of generating noise. Furthermore, in the technologies disclosed in Patent Documents 1 and 2, since the flanges are simply clamped together and fixed, there is a problem that the fixing force between the flanges is relatively low.

[0009] Therefore, the present invention was devised in view of the above-mentioned problems, and its objective is to provide fastening fittings, 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 steel members having through holes formed therein, and comprises a first locking portion having a through portion that can pass through each of the through holes formed in adjacent steel members, a head that can be screwed into one end of the through portion, and an enlarged diameter portion that is disposed between the head and the steel member and is formed to be larger in diameter than the through hole, wherein the through portion is formed by bending a rod-shaped member and has a screw portion on one end into which the head is screwed, and a second locking portion that extends perpendicular to the screw portion, wherein the first locking portion and the second locking portion fasten adjacent steel members together by sandwiching them, wherein the head and the enlarged diameter portion of the first locking portion are integrated, and the second locking portion has a first projection formed by bending the rod-shaped member on the surface facing the steel member.

[0011] The steel member fastening structure according to the present invention is a steel member fastening structure for fastening together steel members having through holes formed therein, comprising: 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 a fastening fitting for fastening the first steel member and the second steel member, wherein the fastening fitting has a through portion that penetrates the first through hole and the second through hole, a head provided on one end side of the through portion, and a part disposed between the head and the first steel member and formed to be larger in diameter than the first through hole The through portion has an enlarged diameter portion and a first locking portion, the through portion being formed by bending a rod-shaped member and having a threaded portion into which the head is screwed on one end side and a second locking portion extending perpendicular to the threaded portion, the first locking portion and the second locking portion fastening together by sandwiching the adjacent first steel member and the second steel member, the first locking portion having the head and the enlarged diameter portion integrated together, and the second locking portion having a first projection formed by bending the rod-shaped member on the surface facing the second steel member.

[0012] The present invention relates to a method for fastening steel members, which fastens steel members having through holes, and comprises a through portion that penetrates 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 screwable head on one end of the through portion and an enlarged diameter portion integrated with the head and formed to be larger in diameter than the first through hole, wherein the through portion is formed by bending a rod-shaped member and has a screw portion on one end that the head is screwed into, and a second locking portion that extends perpendicular to the screw portion, and the screw portion is fastened in advance using a fastening fitting. The method comprises a through-hole step of screwing the head onto the first through-hole and the second through-hole, passing the second locking portion through the first through-hole and the second locking portion, and arranging the first steel member and the second steel member between the first locking portion and the second locking portion; and a fastening step of further screwing the head onto the threaded portion, thereby fastening the first steel member and the second steel member by sandwiching them between the first locking portion and the second locking portion, wherein the second locking portion has a first projection formed by bending the rod-shaped member on the surface facing the second steel member, and in the fastening step, the first projection is brought into contact with the second steel member. [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 drawing]

[0014] [Figure 1] Figure 1 is a perspective view showing a first example of a fastening structure for steel members according to the first embodiment. [Figure 2] Figure 2(a) is a front view showing a first example of a fastening structure for steel members according to the first embodiment, and Figure 2(b) is a side view thereof. [Figure 3] Figure 3(a) is a side view showing a first example of a fastening fitting according to the first embodiment, and Figure 3(b) is a plan view thereof. [Figure 4]Fig. 4(a) is a front view showing the state before the through portion penetrates from the other end side in the penetration process of the method for fastening steel members, and Fig. 4(b) is a side view thereof. [Figure 5] Fig. 5(a) is a front view showing the state before being fastened by being sandwiched between the first locking portion and the second locking portion in the method for fastening the liner plate, and Fig. 5(b) is a front view showing the state after being fastened by being sandwiched between the first locking portion and the second locking portion in the method for fastening the liner plate. [Figure 6] Fig. 6 is a diagram for explaining the bending moment acting on the fastening fitting when an external force acts on the corrugated steel sheet. Fig. 6(a) is an example of a fastening fitting in which the head portion and the enlarged diameter portion are configured to be separable, and Fig. 6(b) is an example of a fastening fitting in which the head portion and the enlarged diameter portion are integrally formed. [Figure 7] Fig. 7(a) is a front view showing a second example of the fastening fitting according to the first embodiment, and Fig. 7(b) is a side view thereof. [Figure 8] Fig. 8(a) is a front view showing a second example of the fastening structure of the steel member according to the first embodiment, and Fig. 8(b) is a side view thereof. [Figure 9] Fig. 9 is a perspective view showing an example of the fastening structure of the steel member according to the second embodiment. [Figure 10] Fig. 10(a) is a front view showing an example of the fastening structure of the steel member according to the second embodiment, and Fig. 10(b) is a side view thereof. [Figure 11] Fig. 11(a) is a front view showing the state before the through portion penetrates from the other end side in the penetration process of the method for fastening steel members, and Fig. 11(b) is a side view thereof. [Figure 12] Fig. 12(a) is a front view showing the state before being fastened by being sandwiched between the first locking portion and the second locking portion in the method for fastening steel members, and Fig. 12(b) is a front view showing the state after being fastened by being sandwiched between the first locking portion and the second locking portion in the method for fastening steel members. [Figure 13] Fig. 13 is a front view showing the state where the axis of the screw portion tilts during fastening. [Figure 14]FIG. 14(a) is a front view showing a state before fastening by sandwiching with a first locking portion and a second locking portion in a method of fastening a liner plate according to the first example of the third embodiment, and FIG. 14(b) is a front view showing a state after fastening by sandwiching with the first locking portion and the second locking portion in the method of fastening the liner plate according to the first example of the third embodiment. [Figure 15] FIG. 15(a) is a front view showing a state before fastening by sandwiching with a first locking portion and a second locking portion in a method of fastening a liner plate according to the second example of the third embodiment, and FIG. 15(b) is a front view showing a state after fastening by sandwiching with the first locking portion and the second locking portion in the method of fastening the liner plate according to the second example of the third embodiment. [Figure 16] FIG. 16(a) is a front view showing a state before fastening by sandwiching with a first locking portion and a second locking portion in a method of fastening a liner plate according to the first example of the fourth embodiment, and FIG. 16(b) is a front view showing a state after fastening by sandwiching with the first locking portion and the second locking portion in the method of fastening the liner plate according to the first example of the fourth embodiment. [Figure 17] FIG. 17(a) is a front view showing a state before fastening by sandwiching with a first locking portion and a second locking portion in a method of fastening a liner plate according to the second example of the fourth embodiment, and FIG. 17(b) is a front view showing a state after fastening by sandwiching with the first locking portion and the second locking portion in the method of fastening the liner plate according to the second example of the fourth embodiment. [Figure 18] FIG. 18 is a perspective view showing an example of a fastening structure of a steel member according to the fifth embodiment. [Figure 19] FIG. 19(a) is a side view showing an example of a fastening structure of a steel member according to the fifth embodiment, and FIG. 19(b) is a bottom view thereof. [Figure 20] FIG. 20 is a side view showing a state before passing a through portion from the other end side in a passing process in a method of fastening a steel member. [Figure 21]Figure 21(a) is a side view showing the state before the steel members are fastened together by the first locking part and the second locking part in the fastening method, and Figure 21(b) is a side view showing the state after the steel members are fastened together by the first locking part and the second locking part in the fastening method. [Modes for carrying out the invention]

[0015] The following describes in detail, with reference to the drawings, embodiments for implementing fastening fittings, fastening structures for steel members, and fastening methods for steel members to which the present invention is applied.

[0016] (First Embodiment) Figure 1 is a perspective view showing a first example of the fastening structure 100 for steel members according to the first embodiment. Figure 2(a) is a front view showing a first example of the fastening structure 100 for steel members according to the first embodiment, and Figure 2(b) is a side view thereof. Figure 3(a) is a side view showing a first example of the fastening fitting 1 according to the first embodiment, and Figure 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 through hole 92 formed in the flange 91.

[0018] Liner plates 9 are fastened together with other adjacent liner plates 9 to form a cylindrical structure. The cylindrical liner plates 9 are installed in shafts, above ground, etc., and are used as earth retaining structures when constructing deep foundation piles, collection wells, underwater temporary cofferdams, bridge piers, etc.

[0019] The liner plate 9 is a corrugated steel plate formed in a wavy shape in the vertical direction, and has flanges 91 at the upper end, lower end, and both sides of the corrugated steel plate. Through holes 92 are formed in the flanges 91.

[0020] When the liner plate 9 has circumferential flanges 91 at the upper and lower ends of the corrugated steel plate and axial flanges 91 at both ends of the corrugated steel plate, the fastening structure 100 of the steel members may be configured to fasten adjacent liner plates in the vertical direction by fastening the circumferential flanges together. Alternatively, the fastening structure 100 of the steel members may be configured to fasten adjacent liner plates in the lateral direction by fastening the axial flanges together.

[0021] The steel member fastening structure 100 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. The fastening fitting 1 comprises a through portion 2 and a first locking portion 3.

[0024] The through-hole 2 is made of a rod-shaped member such as steel, formed in a cylindrical shape or the like. The through-hole 2 penetrates the first through-hole 92-1 and the second through-hole 92-2. The through-hole 2 is provided with a first locking portion 3 screwed into one end 2a side.

[0025] The through portion 2 is formed by bending a rod-shaped member into an L-shape. The through portion 2 has a threaded portion 29 into which the first locking portion 3 is screwed on one end 2a, and a second locking portion 22 extending perpendicular to the threaded portion 29. The threaded portion 29 has a cylindrical outer surface into which a screw thread or screw groove is formed into which the first locking portion 3 can be screwed. The through portion 2 may be formed into an L-shape by, for example, bending. The through portion 2 may be formed into an L-shape by forging, casting, etc. The through portion 2 may be formed into an L-shape by joining two rod-shaped members by welding, etc.

[0026] The through portion 2 has a corner portion 28 connecting the threaded portion 29 and the second locking portion 22 that is formed at approximately a right angle, so that the threaded portion 29 and the second locking portion 22 are arranged perpendicularly to each other. The first curved surface L is a hypothetical surface along the threaded portion 29 and the second locking portion 22.

[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 in a cylindrical shape, for example, but may also be formed in a rectangular prism shape such as a square prism or a hexagonal prism.

[0028] 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 be larger in diameter than the first through hole 92-1 and the second through hole 92-2. Preferably, the first locking portion 3 is formed with at least two parallel sides, and is formed in a prismatic shape such as a hexagonal prism.

[0029] The first locking portion 3 and the second locking portion 22 are fastened together by sandwiching the first flange 91-1 and the second flange 91-2. 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.

[0030] The first locking portion 3 is, for example, a flanged nut, and has a head 30 as a nut and an enlarged diameter portion 31 as a flange formed to be larger in diameter than the head 30. That is, the head 30 and the enlarged diameter portion 31 of the first locking portion 3 are integrated. Since the first locking portion 3 can be screwed onto the threaded portion 29, the distance H1 between the first locking portion 3 and the second locking portion 22 can be adjusted as appropriate. The enlarged diameter portion 31 is a flange 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 30 as a nut and the enlarged diameter portion 31 as a washer are integrated by welding or the like.

[0031] Next, a method for fastening steel members will be described. The method for connecting steel members involves fastening liner plates 9, each having a through hole 92 formed in the flange 91, using a fastening fitting 1. The method for fastening steel members comprises a through-hole 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 positioned opposite each other in advance.

[0032] Figure 4(a) is a front view showing the state of the penetration portion 2 before it is penetrated from the other end 2b side during the penetration process in the method of fastening steel members, and Figure 4(b) is a side view thereof.

[0033] In the penetration process, the first locking portion 3 is pre-screwed onto one end 2a of the penetration portion 2 such 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.

[0034] Then, in the penetration process, the through 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 penetration process, the first curved surface L is made to fit within the width range of the flange 91.

[0035] Figure 5(a) is a front view showing the state before the liner plate is fastened by being sandwiched between the first locking portion 3 and the second locking portion 22 in the fastening method. Then, in the through-hole process, the corner portion 28 of the through-hole 2 is passed through the first through-hole 92-1 and the second through-hole 92-2 by rotating in a direction along the first curved surface L, and the first flange 91-1 and the second flange 91-2 are positioned between the first locking portion 3 and the second locking portion 22.

[0036] 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 first flange 91-1 and the thickness t2 of the second flange 91-2. Therefore, in 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.

[0037] Furthermore, when the difference Δh is defined as 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, and this difference is defined 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.

[0038] Figure 5(b) is a front view showing the state after the liner plate has been fastened by being sandwiched 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 through portion 2. As a result, as shown in Figure 5(b), the second locking portion 22, which is spaced apart from the second flange 91-2, moves closer to the second flange 91-2, and the distance H1 from the first locking portion 3 to the second locking portion 22 gradually decreases, fastening the first flange 91-1 and the second flange 91-2 by being sandwiched between the first locking portion 3 and the second locking portion 22.

[0039] In the fastening process, when screwing the first locking portion 3 onto the threaded portion 29, the first locking portion 3 may be held in place with a predetermined clamping means such as a spanner, and the threaded portion 29 may be rotated with an impact wrench or the like relative to the clamped first locking portion 3, thereby screwing the head 30 of the first locking portion 3 onto the threaded portion 29. Alternatively, in the fastening process, when screwing the head 30 of the first locking portion 3 onto the threaded portion 29, the through portion 2 may be held down with a spud wrench or the like, and the head 30 of the first locking portion 3 may be rotated relative to the threaded portion 29, thereby screwing the first locking portion 3 onto the threaded portion 29. In this way, by holding at least one of the first locking portion 3 and the through portion 2, it is possible to prevent the first locking portion 3 and the threaded portion 29 from rotating together.

[0040] Furthermore, during the fastening process, when rotating the head 30 of the first locking portion 3 relative to the threaded portion 29, it is preferable to bring the other end 2b of the through portion 2 into contact with the second liner plate 9-2 before rotating the first locking portion 3 relative to the threaded portion 29. This prevents the other end 2b, which is in contact with the steel member, from rotating. Therefore, it is possible to prevent the first locking portion 3 and the threaded portion 29 from rotating together.

[0041] In this way, during the fastening process, the first liner plate 9-1 and the second liner plate 9-2 are fastened together by being sandwiched between the first locking portion 3 and the second locking portion 22.

[0042] This completes the method for fastening the liner plates.

[0043] In the method for fastening the liner plates, multiple fastening fittings 1 may be used, and after sequentially performing the penetration process for each fastening fitting 1, the fastening process may be performed on all fastening fittings 1 at once after the penetration process is completed. Alternatively, in the method for fastening the liner plates, multiple fastening fittings 1 may be used, and the penetration process and fastening process may be repeated for each fastening fitting 1.

[0044] According to this embodiment, the head 30 of the first locking portion 3 is screwed into the threaded portion 29 formed at one end 2a of the through portion 2. As a result, the first locking portion 3 and the second locking portion 22 can be tightly fastened together by sandwiching 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. Therefore, versatility can be increased.

[0045] Furthermore, according to this embodiment, the head 30 of the first locking portion 3 is screwed into the threaded portion 29 formed at 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, sandwiching the first flange 91-1 and the second flange 91-2. As a result, sufficient fastening force can be ensured.

[0046] Furthermore, according to this embodiment, the work of hammering in specialized jigs or other striking means such as hammers, which was necessary when clamping the clamping portion of conventional metal fittings onto the flange or removing it from the liner plate, can be omitted. Therefore, it is possible to reduce noise during construction.

[0047] Furthermore, according to this embodiment, in the through-hole process, the head 30 of the first locking part 3 is pre-screwed onto the threaded portion 29, and in the fastening process, the head 30 of the first locking part 3 is further screwed onto the threaded portion 29, thereby fastening the first flange 91-1 and the second flange 91-2 together by sandwiching them between the first locking part 3 and the second locking part 22. This eliminates the need to screw nuts onto bolts from scratch, which was necessary when joining liner plates together using conventional bolts. As a result, construction time can be shortened.

[0048] According to this embodiment, in the fastening process, the head 30 of the first locking portion 3 is further screwed into the threaded portion 29, thereby fastening the first flange 91-1 and the second flange 91-2 by sandwiching them between the first locking portion 3 and the second locking portion 22. As a result, the first locking portion 3 and the second locking portion 22 can fasten the first flange 91-1 and the second flange 91-2 by sandwiching them, regardless of the thickness of the first flange 91-1 and the second flange 91-2. Therefore, it is possible to increase versatility.

[0049] According to this embodiment, the second locking portion 22 can penetrate both 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 housed within the width of the flange 91 without protruding into the space formed inside the flange 91. Therefore, the necessary design diameter can be secured for multiple liner plates 9 fastened together in a cylindrical shape, and construction costs can be reduced.

[0050] Furthermore, according to this embodiment, the difference Δh is smaller than the height h1 of the first locking portion 3. This makes the distance required for the first locking portion 3 and the second locking portion 22 to fasten together between the first flange 91-1 and the second flange 91-2 smaller than the height h1 of the first locking portion 3. As a result, the work of fastening together the first locking portion 3 and the second locking portion 22 between the first flange 91-1 and the second flange 91-2 can be easily performed, and the construction time can be shortened.

[0051] Further, according to the present embodiment, after performing a penetration process on each fastening fitting 1 using a plurality of fastening fittings 1, a fastening process is performed on each fastening fitting 1. As a result, when fastening a steel member using a plurality of fastening fittings 1, the time for changing the setup when fastening the fastening fitting 1 with an impact wrench or the like can be shortened. Therefore, the construction time can be significantly shortened.

[0052] As shown in FIG. 6, the distance D1 from the axis C of the threaded portion 29 to the peripheral edge of the head portion 30 is defined, and the distance D2 from the axis C of the threaded portion 29 to the peripheral edge of the enlarged diameter portion 31 is defined. At this time, D1 < D2 is satisfied. If the head portion 30 is screwed too much onto the threaded portion 29, the second locking portion 22 that was in contact with the second flange 91-2 may be displaced with respect to the second flange 91-2, and the axis C may become inclined. At this time, a bending moment M that suppresses the inclination of the axis C acts.

[0053] As shown in FIG. 6(a), when the head portion 30 and the enlarged diameter portion 31 are configured to be separable, when an external force or the like acts on the corrugated steel plate, the head portion 30 and the enlarged diameter portion 31 are separated, and the head portion 30 is about to be pulled out with the point B1 of the head portion 30 as a fulcrum. Therefore, the bending moment M-1 is represented by the product of the pulling force acting on the axis C of the threaded portion 29 and the distance D1. On the other hand, as shown in FIG. 6(b), when the head portion 30 and the enlarged diameter portion 31 are integrally configured as in the present invention, when an external force or the like acts on the corrugated steel plate, since the head portion 30 and the enlarged diameter portion 31 are integral, the head portion 30 is about to be pulled out with the point B2 of the enlarged diameter portion 31 as a fulcrum. Therefore, the bending moment M-2 is represented by the product of the pulling force acting on the axis C of the threaded portion 29 and the distance D2. Since D1 < D2, the bending moment M-2 when the head portion 30 and the enlarged diameter portion 31 are integrally configured can be made larger than the bending moment M-1 when the head portion 30 and the enlarged diameter portion 31 are configured to be separable.

[0054] Therefore, according to this embodiment, the first locking portion 3 has a head 30 that is screwed onto the threaded portion 29 and an enlarged diameter portion 31 that is formed to be larger in diameter than the head 30, and the head 30 and the enlarged diameter portion 31 are integrated. As a result, the bending moment M acting on the fastening fitting 1 can be made larger than when the head 30 and the enlarged diameter portion 31 are configured to be separable. This makes it possible to suppress the tilt of the axis C of the threaded portion 29.

[0055] Figure 7(a) is a front view showing a second example of the fastening fitting 1 according to the first embodiment, and Figure 7(b) is a side view thereof.

[0056] In this fastening fitting 1, the through portion 2 has a curved corner portion 28 connecting the threaded portion 29 and the second locking portion 22, and the threaded portion 29 and the second locking portion 22 are arranged perpendicularly to each other. Even in this case, it is possible to achieve the effects described above.

[0057] Figure 8(a) is a front view showing a second example of the steel member fastening structure 100 according to the first embodiment, and Figure 8(b) is a side view thereof.

[0058] The liner plate fastening structure 100 in this example comprises a first liner plate 9-1, a second liner plate 9-2, a fastening fitting 1, and a reinforcing ring 7.

[0059] The reinforcing ring 7 is installed between the first liner plate 9-1 and the second liner plate, and is intended to reinforce the fastened liner plates together. For example, an H-shaped steel beam can be used for the reinforcing ring 7.

[0060] The reinforcing ring 7 has a reinforcing web 71 positioned 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 positioned inside the inner end 91a of the flange 91.

[0061] 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. 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 housed within the width of the flange 91 without protruding into the space formed inside the flange 91.

[0062] 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 liner plate fastened using the reinforcing ring 7 can be reinforced.

[0063] (Second Embodiment) Figure 9 is a perspective view showing an example of the fastening structure 100 for steel members according to the second embodiment. Figure 10(a) is a front view showing an example of the fastening structure 100 for steel members according to the second embodiment, and Figure 10(b) is a side view thereof.

[0064] In the steel member fastening structure 100, corrugated steel plates 90 are used as the steel members. The steel member fastening structure 100 fastens together corrugated steel plates 90, each having a through hole 92 formed at its end.

[0065] The corrugated steel sheets 90 are fastened together with other adjacent corrugated steel sheets 90 to form a U-shaped cross-section. The U-shaped corrugated steel sheets 90 are installed on the ground or elsewhere and used as a waterway or the like.

[0066] The corrugated steel sheet 90 is formed in a wave shape with repeating peaks 94 and valleys 95, and through holes 92 are formed at the ends of the peaks 94. Multiple corrugated steel sheets 90 are overlapped at their ends and fastened together by fastening fittings 1. In the second embodiment, the configuration in which through holes 92 are formed in the peaks 94 is described, but through holes 92 may be formed in the valleys 95 and fastened together by fastening fittings 1.

[0067] The steel member fastening structure 100 comprises a first corrugated steel plate 90-1, a second corrugated steel plate 90-2, and a fastening fitting 1.

[0068] Next, a method for fastening steel members will be described. The method for connecting steel members involves fastening corrugated steel plates 90 in which through holes 92 are formed, and fastening fittings 1 are used. The method for fastening steel members comprises a through-hole 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 positioned opposite each other in advance.

[0069] Figure 11(a) is a front view showing the state of the penetration portion 2 before it is penetrated from the other end 2b side in the penetration process of the fastening method for steel members, and Figure 11(b) is a side view thereof.

[0070] In the penetration process, the head 30 of the first locking portion 3 is pre-screwed into one end 2a of the penetration portion 2 such 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 corrugated steel plate 90-1 and the thickness t2 of the second corrugated steel plate 90-2.

[0071] Then, in the through-hole process, the through-hole 2 is passed through the first through-hole 92-1 and the second through-hole 92-2 from the other end 2b side.

[0072] Figure 12(a) is a front view showing the state before the steel members are fastened together by being sandwiched between the first locking portion 3 and the second locking portion 22 in the fastening method. Then, in the through-hole process, the corner portion 28 of the through-hole 2 is passed through the first through-hole 92-1 and the second through-hole 92-2 by rotating in a direction along the first curved surface L, and the first corrugated steel plate 90-1 and the second corrugated steel plate 90-2 are positioned between the first locking portion 3 and the second locking portion 22.

[0073] 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 first flange 91-1 and the thickness t2 of the second flange 91-2. Therefore, in 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.

[0074] Furthermore, when the difference Δh is defined as 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 corrugated steel plate 90-1 and the thickness t2 of the second corrugated steel plate 90-2, and this difference is defined 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.

[0075] Figure 12(b) is a front view showing the state after the steel members have been fastened together by being sandwiched between the first locking part 3 and the second locking part 22 in the fastening method. In the fastening process, the head 30 of the first locking part 3 is screwed into the threaded part 29 formed on one end 2a of the through part 2. As a result, as shown in Figure 12(b), the second locking part 22, which is separated from the second corrugated steel plate 90-2, moves closer to the second corrugated steel plate 90-2, and the distance H1 from the first locking part 3 to the second locking part 22 gradually decreases, fastening the first corrugated steel plate 90-1 and the second corrugated steel plate 90-2 together by being sandwiched between the first locking part 3 and the second locking part 22.

[0076] In this way, during the fastening process, the first corrugated steel plate 90-1 and the second corrugated steel plate 90-2 are fastened together by being sandwiched between the first locking portion 3 and the second locking portion 22.

[0077] According to this embodiment, the through portion 2 has a threaded portion 29 formed at one end 2a into which the first locking portion 3 is screwed. This allows the first locking portion 3 and the second locking portion 22 to be tightly fastened 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.

[0078] Furthermore, according to this embodiment, the first locking portion 3 is screwed into the threaded portion 29 formed at 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, sandwiching the first corrugated steel plate 90-1 and the second corrugated steel plate 90-2. As a result, sufficient fastening force can be ensured.

[0079] Furthermore, according to this embodiment, the work of hammering in specialized jigs or other striking means such as hammers, which was necessary when clamping the clamping portion of conventional metal fittings onto the flange or removing it from the liner plate, can be omitted. Therefore, it is possible to reduce noise during construction.

[0080] Furthermore, according to this embodiment, in the through-hole process, the first locking portion 3 is pre-screwed onto the threaded portion 29, and in the fastening process, the first locking portion 3 is further screwed onto the threaded portion 29, thereby fastening the first corrugated steel plate 90-1 and the second corrugated steel plate 90-2 together by sandwiching them 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 using conventional bolts. As a result, construction time can be shortened.

[0081] According to this embodiment, in the fastening process, the first locking portion 3 is further screwed into the threaded portion 29, thereby fastening the first corrugated steel plate-1 and the second corrugated steel plate 90-2 by sandwiching them between the first locking portion 3 and the second locking portion 22. As a result, the first locking portion 3 and the second locking portion 22 can fasten the first corrugated steel plate 90-1 and the second corrugated steel plate 90-2 by sandwiching them between the two, regardless of their thickness. Therefore, versatility can be increased.

[0082] Furthermore, according to this embodiment, the difference Δh is smaller than the height h1 of the first locking portion 3. This makes the distance required for the first locking portion 3 and the second locking portion 22 to fasten the first corrugated steel plate 90-1 and the second corrugated steel plate 90-2 between them smaller than the height h1 of the first locking portion 3. As a result, the work of fastening the first locking portion 3 and the second locking portion 22 between the first corrugated steel plate 90-1 and the second corrugated steel plate 90-2 can be easily performed, and the construction time can be shortened.

[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-hole 2 to abut against the steel member, and the first locking portion 3 to rotate relative to the threaded portion 29. As a result, the other end 2b that abuts against the steel member cannot rotate, thus preventing the first locking portion 3 and the threaded portion 29 from rotating together.

[0084] According to this embodiment, the head 30 and the enlarged diameter portion 31 are integrated. This allows for 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. As a result, tilting of the axis C of the threaded portion 29 can be suppressed, and a decrease in the degree of fixation between the first corrugated steel plate 90-1 and the second corrugated steel plate 90-2 can be suppressed.

[0085] (Third embodiment) Figure 13 is a front view showing the state in which the axis C of the threaded portion 29 is tilted when fastened. In the fastened state shown in Figure 5(b), the second locking portion 22 is parallel to the second flange 91-2, making it possible to firmly fix the first flange 91-1 and the second flange 91-2. However, if the fastening is further increased from the state in Figure 5(b), as shown in Figure 13, the through portion 2 may be pulled out excessively, causing the axis C of the threaded portion 29 to tilt. At this time, the degree of fixation between the first flange 91-1 and the second flange 91-2 may decrease, which is undesirable. When transitioning from the state in Figure 5(b) to the state in Figure 13, the contact point A1 between the second through hole 92-2 and the orthogonal portion of the second locking portion 22 shown in Figure 5(b) moves towards the other end 2b side in Figure 13 (contact point A1 → A1'). If this movement can be suppressed, the axis C of the threaded portion 29 will not tilt. The following third and fourth embodiments describe examples illustrating the countermeasures.

[0086] Figure 14(a) is a front view showing the state before the liner plate is clamped and fastened by the first locking part and the second locking part in the liner plate fastening method according to the first example of the third embodiment, and Figure 14(b) is a front view showing the state after the liner plate is clamped and fastened by the first locking part and the second locking part in the liner plate fastening method according to the first example of the third embodiment. Figure 15(a) is a front view showing the state before the liner plate is clamped and fastened by the first locking part and the second locking part in the liner plate fastening method according to the second example of the third embodiment, and Figure 15(b) is a front view showing the state after the liner plate is clamped and fastened by the first locking part and the second locking part in the liner plate fastening method 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 projection 25 that contacts the second flange 91-2. Preferably, the first projection 25 is provided in a position close to the second through hole 92-2 of the second flange 91-2.

[0088] As shown in Figure 14, the first projection 25 is formed by threading, such as by screw threading. In this case, the through portion 2 may be made from, for example, a fully threaded bolt that has been bent into an L-shape.

[0089] As shown in Figure 15, the through portion 2 is made of a straight rod-shaped member that has been bent into an L-shape, and the first projection 25 is a projection formed on the inside of the bend when the rod-shaped member is bent into an L-shape. The first projection 25 may also be formed by attaching a projection made of steel or the like to the second locking portion 22.

[0090] In the method for fastening steel members according to the third embodiment, in the through-hole step, as shown in Figures 14(a) and 15(a), the corner portion 28 of the through-hole 2 is passed through the first through-hole 92-1 and the second through-hole 92-2 by rotating in a direction along the first curved surface L, and the first flange 91-1 and the second flange 91-2 are positioned between the first locking portion 3 and the second locking portion 22.

[0091] 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 first flange 91-1 and the thickness t2 of the second flange 91-2. Therefore, in the penetration process, the first locking portion 3 is locked to the first flange 91-1, and the first projection 25 of the second locking portion 22 is separated from the second flange 91-2.

[0092] Next, in the fastening process, 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 Figures 14(b) and 15(b), the first projection 25 of the second locking portion 22, which is spaced apart 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, fastening the first flange 91-1 and the second flange 91-2 by sandwiching them between the first locking portion 3 and the first projection 25 of the second locking portion 22. At this time, the first projection 25 can be bitten into the second flange 91-2.

[0093] According to this embodiment, the second locking portion 22 has a first projection 25 on the surface that contacts the second flange 91-2. As a result, when the first flange 91-1 and the second flange 91-2 are clamped and fastened together by the first locking portion 3 and the first projection 25 of the second locking portion 22, the first projection 25 can be bitten into the second flange 91-2. This prevents the second locking portion 22 from shifting relative to the second flange 91-2. As a result, the inclination of the axis C of the threaded portion 29 is suppressed, and the first flange 91-1 and the second flange 91-2 can be firmly fixed together.

[0094] In this case, if the fastening fitting 1 is pulled out due to excessive tightening or the like, the area near the corner of the second through hole 92-2 of the second flange 91-2 will receive the most contact force from the through hole 2. In this respect, according to this embodiment, the first projection 25 is provided in a position close 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. As a result, the inclination of the axis C of the threaded portion 29 is suppressed, and the first flange 91-1 and the second flange 91-2 can be fixed even more firmly.

[0095] (Fourth Embodiment) Figure 16(a) is a front view showing the state before the liner plate is clamped and fastened by the first locking part and the second locking part in the liner plate fastening method according to the first example of the fourth embodiment, and Figure 16(b) is a front view showing the state after the liner plate is clamped and fastened by the first locking part and the second locking part in the liner plate fastening method according to the first example of the fourth embodiment. Figure 17(a) is a front view showing the state before the liner plate is clamped and fastened by the first locking part and the second locking part in the liner plate fastening method according to the second example of the fourth embodiment, and Figure 17(b) is a front view showing the state after the liner plate is clamped and fastened by the first locking part and the second locking part in the liner plate fastening method 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 projection 96 that contacts the second locking portion 22. Preferably, the second projection 96 is provided in a position close to the second through hole 92-2 of the second flange 91-2.

[0097] As shown in Figure 16, the second projection 96 is a projection formed on the circumferential edge of the second through hole 92-2, and is formed by burring.

[0098] As shown in Figure 17, the second projection 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 through-hole step, as shown in Figures 16(a) and 17(a), the corner portion 28 of the through-hole 2 is passed through the first through-hole 92-1 and the second through-hole 92-2 by rotating in a direction along the first curved surface L, and the first flange 91-1 and the second flange 91-2 are positioned between the first locking portion 3 and the second locking portion 22.

[0100] 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 first flange 91-1 and the thickness t2 of the second flange 91-2. Therefore, in 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 process, 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 Figures 16(b) and 17(b), the second locking portion 22, which is spaced apart from the second flange 91-2, moves closer to the second flange 91-2, and the distance H1 from the first locking portion 3 to the second locking portion 22 gradually decreases, fastening the first flange 91-1 and the second projection 96 formed on the second flange 91-2 between the first locking portion 3 and the second locking portion 22. At this time, the second projection 96 can be bitten into the second locking portion 22.

[0102] According to this embodiment, the second corrugated steel plate 90-2 has a second projection 96 that contacts the second locking portion 22. As a result, when the first flange 91-1 and the second flange 91-2 are clamped and fastened together by the first locking portion 3 and the second locking portion 22, the second projection 96 can be bitten into the second locking portion 22. Therefore, if the fastening fitting 1 is pulled out due to excessive fastening or the like, the second locking portion 22 is prevented from shifting relative to the second flange 91-2. As a result, the inclination of the axis C of the screw portion 29 is suppressed, and the first flange 91-1 and the second flange 91-2 can be firmly fixed together.

[0103] In this case, if the fastening fitting 1 is pulled out due to excessive tightening or the like, the area near the corner of the second through hole 92-2 of the second flange 91-2 will receive the most contact force from the through hole 2. In this respect, according to this embodiment, the second projection 96 is provided in a position close 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. As a result, the inclination of the axis C of the threaded portion 29 is suppressed, and the first flange 91-1 and the second flange 91-2 can be fixed even more firmly.

[0104] (Fifth embodiment) Next, the fastening structure 100 for steel members according to the fifth embodiment will be described. Figure 18 is a perspective view showing an example of the fastening structure 100 for steel members according to the fifth embodiment. Figure 19(a) is a side view showing an example of the fastening structure 100 for steel members according to the fifth embodiment, and Figure 19(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 column 8-2 is used as the second steel member. The steel member fastening structure 100 fastens the steel plate 8-1 and the support column 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, and the portion that contacts the support post 8-2 is curved. A second through hole 82-2 is formed in the portion of the steel plate 8-1 that contacts the support post 8-2. Holes are formed in both ends of the steel plate 8-1, and connecting fittings are used to which fence panels such as protective fences (not shown) can be connected through these holes.

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

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

[0109] Next, a method for fastening steel members will be described. The method for connecting steel members involves fastening a steel plate 8-1 in which a first through hole 82-1 is formed and a support column 8-2 in which a second through hole 82-2 is formed, and fastening fittings 1 are used. The method for fastening steel members comprises a through-hole 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 positioned opposite each other in advance.

[0110] Figure 20 is a side view showing the state of the penetration portion 2 before it is penetrated from the other end 2b side during the penetration process in the method of fastening steel members.

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

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

[0113] Figure 21(a) is a side view showing the state before the steel members are fastened together by being sandwiched between the first locking part 3 and the second locking part 22 in the fastening method. In the through-hole process, the corner 28 of the through-hole 2 is passed through the first through-hole 82-1 and the second through-hole 82-2 by rotating in a direction along the first curved surface L, and the steel plate 8-1 and the support column 8-2 are positioned between the first locking part 3 and the second locking part 22.

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

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

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

[0117] In this way, during the fastening process, the steel plate 8-1 and the support column 8-2 are fastened together by being sandwiched between the first locking part 3 and the second locking part 22.

[0118] In this embodiment, the first locking portion 3 is screwed into the threaded portion 29 formed at one end 2a of the through portion 2. This allows the first locking portion 3 and the second locking portion 22 to be tightly fastened together, sandwiching the steel plate 8-1 and the support column 8-2, regardless of the thickness of the steel plate 8-1 and the support column 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 at 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, sandwiching the steel plate 8-1 and the support column 8-2. As a result, sufficient fastening force can be ensured.

[0120] Furthermore, according to this embodiment, in the penetration process, the first locking portion 3 is pre-screwed onto the threaded portion 29, and in the fastening process, the first locking portion 3 is further screwed onto the threaded portion 29, thereby fastening the steel plate 8-1 and the support column 8-2 by sandwiching them 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 the steel plate and support column with conventional bolts. As a result, construction time can be shortened.

[0121] Furthermore, according to this embodiment, since the steel plate 8-1 and the support column 8-2 are fastened together by sandwiching them between the first locking portion 3 and the second locking portion 22, it is sufficient to form the second through-hole 82-2 in the cylindrical side wall portion of the support column 8-2, and it is not necessary to form a through-hole at a position opposite to the second through-hole 82-2. Therefore, the joining work using through-bolts that pass through the support column, which was necessary when fixing conventional steel plates, becomes unnecessary. As a result, construction work can be carried out in a shorter time.

[0122] According to this embodiment, in the fastening process, the first locking portion 3 is further screwed into the threaded portion 29, thereby fastening the steel plate 8-1 and the support column 8-2 by sandwiching them between the first locking portion 3 and the second locking portion 22. As a result, the first locking portion 3 and the second locking portion 22 can fasten the steel plate 8-1 and the support column 8-2 by sandwiching them between them, regardless of the thickness of the steel plate 8-1 and the support column 8-2. Therefore, it is possible to increase versatility.

[0123] Furthermore, according to this embodiment, the difference Δh is smaller than the height h1 of the first locking part 3. This makes the distance required for the first locking part 3 and the second locking part 22 to fasten together between the steel plate 8-1 and the support column 8-2 smaller than the height h1 of the first locking part 3. As a result, the work of fastening together the first locking part 3 and the second locking part 22 between the steel plate 8-1 and the support column 8-2 can be easily performed, and the construction time can be shortened.

[0124] Furthermore, according to this embodiment, the second through-hole 82-2 is formed in the cylindrical support column 8-2. This allows the other end 2b of the through-hole 2 to contact the inner surface of the support column 8-2, and then the first locking portion 3 can be rotated relative to the screw portion 29. As a result, the other end 2b that is in contact with the curved inner surface of the support column 8-2 cannot rotate, thus preventing the first locking portion 3 and the screw portion 29 from rotating together.

[0125] According to this embodiment, the head 30 and the enlarged diameter portion 31 are integrated. This allows for 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. As a result, tilting of the axis C of the threaded portion 29 can be suppressed, and a decrease in the degree of fixation between the steel plate 8-1 and the support column 8-2 can be suppressed.

[0126] Although some embodiments of this 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 combined as appropriate. In addition, this invention can be implemented in various novel forms other than those described above. Therefore, each of the above embodiments can be omitted, replaced, or modified in various ways without departing from the spirit of this invention. Such novel forms and modifications are included in the scope and spirit of this invention, as well as in the claims and equivalents of the claims. [Explanation of Symbols]

[0127] 100: Fastening structure of steel members 1: Fastening hardware 2: Penetration section 2a: One end 2b: Other end 22: Second locking part 25: 1st protrusion 28: Corner 29: Screw 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 sheet 90-1: First corrugated steel sheet 90-2: Second corrugated steel sheet 92: Through hole 92-1: First through hole 92-2: Second through hole 94: Yamabe 95: Tanibe 96:Second protrusion

Claims

1. A fastening fitting for fastening together steel members in which through holes are formed, A through-hole that can penetrate each of the through-holes formed in adjacent steel members, The first locking portion comprises a head that can be screwed into one end of the through-hole, and an enlarged diameter portion that is positioned between the head and the steel member and is formed to be larger in diameter than the through-hole. The aforementioned through portion is formed by bending a rod-shaped member, One end has a screw portion into which the head is screwed, It has a second locking portion that extends perpendicularly to the screw portion, The first locking portion and the second locking portion are used to fasten adjacent steel members together by sandwiching them between them. The first locking portion is formed by integrating the head portion and the enlarged diameter portion. The second locking portion has a first projection formed on the surface facing the steel member by bending the rod-shaped member. A fastening fitting characterized by the following.

2. The aforementioned through portion is formed by bending a fully threaded bolt. The fastening fitting according to claim 1, characterized by the above.

3. A fastening structure for steel members that fastens together steel members in which through holes are formed, 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, The device comprises fastening fittings for fastening the first steel member and the second steel member together. The aforementioned fastening fitting is A through portion that penetrates the first through hole and the second through hole, The first locking portion has a head provided on one end side of the through-hole, and an enlarged diameter portion positioned between the head and the first steel member and formed to be larger in diameter than the first through-hole. The aforementioned through portion is formed by bending a rod-shaped member, One end has a screw portion into which the head is screwed, It has a second locking portion that extends perpendicularly to the screw portion, The first locking portion and the second locking portion are fastened together by sandwiching the adjacent first steel member and the second steel member. The first locking portion is formed by integrating the head portion and the enlarged diameter portion. The second locking portion has a first projection formed on the surface facing the second steel member by bending the rod-shaped member. A fastening structure for steel members characterized by the following.

4. The aforementioned through portion is formed by bending a fully threaded bolt. A fastening structure for steel members according to claim 3, characterized by the above.

5. The second steel member has a second projection on the surface that comes into contact with the second locking portion. A fastening structure for steel members according to claim 3, characterized by the above.

6. The first steel member and the second steel member are liner plates having flanges in which the through holes are formed. A fastening structure for steel members according to claim 3, characterized by the above.

7. The first steel member and the second steel member are corrugated steel plates. A fastening structure for steel members according to claim 3, characterized by the above.

8. The first steel member is a steel plate, The second steel member is a cylindrical support column. A fastening structure for steel members according to claim 3, characterized by the above.

9. A method for fastening steel members in which through holes are formed, 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, The first locking portion comprises a head that can be screwed into one end of the through-hole, and an enlarged diameter portion that is integrated with the head and is formed to be larger in diameter than the first through-hole. The aforementioned through portion is formed by bending a rod-shaped member, One end has a screw portion into which the head is screwed, A fastening fitting having a second locking portion extending perpendicularly to the screw portion, The process involves first screwing the head onto the threaded portion, passing the second locking portion through the first through hole and the second through hole, and arranging the first steel member and the second steel member between the first locking portion and the second locking portion. The system includes a fastening step of further screwing the head onto the screw portion, thereby fastening the first steel member and the second steel member together by sandwiching them between the first locking portion and the second locking portion, The second locking portion has a first projection formed on the surface facing the second steel member by bending the rod-shaped member, In the fastening process, the first projection is brought into contact with the second steel member. A method for fastening steel members characterized by the following.

10. The aforementioned through portion is formed by bending a fully threaded bolt. A method for fastening steel members according to claim 9, characterized by the above.

11. In the fastening process, the second projection formed on the second steel member and the second locking portion are brought into contact. A method for fastening steel members according to claim 9, characterized by the above.

12. Using multiple fastening fittings, after performing the through-step for each fastening fitting, the fastening step is performed for each fastening fitting. A method for fastening steel members according to claim 9, characterized by the above.

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