JP2023150148A - Binding metal fitting, binding structure of steel member and method for binding steel member - Google Patents

Abstract

To provide a binding metal fitting capable of shortening a construction time.SOLUTION: A binding metal fitting 1 according to the present embodiment is for binding together liner plates 9 in which through holes are formed, and comprises: a penetration part 2 that can be penetrated in each through hole formed in an adjacent liner plate 9; and a first locking part 3 having a head part 30 that can be screwed onto one end part 2a side of the penetration part 2, and an enlarged diameter part 31 formed to have a larger diameter than the through hole. The penetration part 2 has a screw part 29 into which the head part 30 is screwed on the one end part 2a side, and a second locking part 22 extending perpendicularly to the screw part 29. The enlarged diameter part 31 has a flat surface 32 formed on a side surface thereof.SELECTED DRAWING: Figure 1

Description

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

Corrugated steel plates 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 earth retaining material when constructing deep foundation piles, water collection wells, underwater cofferdams, bridge piers, and the like. For example, a plurality of corrugated steel plates are connected together and used as a waterway.

Conventionally, a technique disclosed in Patent Document 1 has been proposed for the purpose of simplifying the work of connecting liner plates to each other.

The fastening fitting for a liner plate disclosed in Patent Document 1 has a penetrating part that can be penetrated into each through hole formed in an adjacent corrugated steel plate, and can be screwed into one end of the penetrating part, and is capable of being screwed into one end of the penetrating part. A first locking portion formed with a large diameter. For the first locking portion, for example, a washer having a circular shape in plan view is used.

JP 2021-124658 Publication

As shown in FIG. 18, the conventional fastening fitting 61 includes a locking part 63 that is screwed into a threaded part 629 at one end of an L-shaped penetrating part 62, and a penetrating part 62 that is orthogonal to the threaded part 629. A locking portion 622 at an end. The conventional fastening fitting 61 can sandwich the flange 691 between the locking part 63 and the locking part 622. The nut 630 of the locking portion 63 is screwed onto the threaded portion 29, and the washer 631 of the locking portion 63 has a curved side surface. When the L-shaped penetration portion 62 is passed through the hole 692 of the flange 691 of the liner plate 69, the curved surface of the washer 631 is brought into contact with the flange 691, as shown in FIG. 18(a). Then, as shown in FIG. 18(b), the penetrating portion 2 is rotated so that the curved surface of the washer 631 stands up against the flange 691. At this time, the distance L2 between the axis C2 of the threaded portion 629 and the curved surface of the washer 631 becomes the radius of rotation. However, since the washer 631 has a curved surface, the distance L2 becomes large. Thereby, when the penetrating portion 62 is passed through the hole 692, there is a possibility that the penetrating portion 62 may interfere with the hole 692. Therefore, there is a concern that the construction time will be long.

Further, when the nut 630 is loosely screwed into the threaded portion 629, interference between the through portion 62 and the hole 692 can be suppressed. However, in this case, when tightening the nut 630 into the threaded part 629 after sandwiching the flange 691 of the liner plate 69 between the washer 631 and the locking part 622, the rotational speed of the nut 630 screwed into the threaded part 629 is will increase. Under these circumstances, there is a need for technology that can shorten construction time.

Therefore, the present invention has been devised in view of the above-mentioned circumstances, and its purpose is to provide a fastening fitting, a fastening structure for steel members, and a fastening structure for steel members that can shorten construction time. An object of the present invention is to provide a method for fastening manufactured parts.

A fastening fitting according to a first aspect of the present invention is a fastening fitting for fastening together steel members in which through holes are formed, and the fastening fitting has a through part that can be penetrated into each through hole formed in an adjacent steel member. , a first locking part having a head that can be screwed onto one end side of the penetrating part, and an enlarged diameter part formed to have a larger diameter than the through hole, the penetrating part comprising: It has a threaded portion on one end side into which the first locking portion is screwed, and a second locking portion extending perpendicularly to the threaded portion, and the enlarged diameter portion has a flat surface on a side surface. It is characterized by the formation of

A fastening fitting according to a second aspect of the present invention is characterized in that, in the first aspect, the head portion and the enlarged diameter portion of the first locking portion are integrated.

The fastening fitting according to a third invention is characterized in that in the first invention or the second invention, the flat surface is formed by linearly cutting out a part of the enlarged diameter part which is circular in plan view. .

A steel member fastening structure according to a fourth aspect of the present invention is a steel member fastening structure for fastening steel members in which through holes are formed, and a first steel member in which a first through hole is formed and 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, and a fastening fitting for fastening the first steel member and the second steel member. , the fastening fitting includes a penetration part penetrated by the first through hole and the second penetration hole, a head provided on one end side of the penetration part, and the head and the first steel member. and a first locking part having a diameter larger than that of the first through hole, and the through part has the head on one end side. and a second locking portion extending orthogonally to the threaded portion, and the first locking portion and the second locking portion are connected to the adjacent The first steel member and the second steel member are sandwiched and tightly connected, and the enlarged diameter portion is characterized in that a flat surface is formed on a side surface.

A fastening structure for steel members according to a fifth aspect of the invention is characterized in that, in the fourth aspect, the normal direction of the flat surface is arranged in a direction different from the extending direction of the second locking part.

A method for fastening steel members according to a sixth aspect of the present invention is a method for fastening steel members in which a through hole is formed, the method comprising: a first through hole formed in a first steel member; a second through hole formed in a second steel member adjacent to the first steel member; a through part penetrated by the second through hole; a head screwable to one end of the through part; a first locking part having a flat surface and an enlarged diameter part formed to have a larger diameter than the first through hole, and the through part has the head on one end side. The head and the enlarged diameter part are placed in advance on the threaded part using a fastening fitting having a threaded part to be screwed together and a second locking part extending orthogonally to the threaded part. the second locking portion is passed through the first through hole and the second through hole with the flat surface facing the first steel member, and the flat surface faces the first steel member. a penetrating step of rotating the penetrating portion so as to stand up against the wall, and arranging the first steel member and the second steel member between the enlarged diameter portion and the second locking portion; , by screwing the head into the screw portion, the first steel member and the second steel member are sandwiched and tightly connected between the first locking portion and the second locking portion; It is characterized by comprising a process.

In the method for fastening steel members according to a seventh aspect of the invention, in the sixth invention, after performing the piercing step for each of the fastening metal fittings using a plurality of the fastening metal fittings, the fastening step for each of the fastening metal fittings is performed. It is characterized by doing the following.

According to the first to fifth inventions, the enlarged diameter portion has a flat surface formed on the side surface. As a result, when the second locking part is passed through the through hole, the normal direction of the flat surface and the extending direction of the second locking part are the same direction, and the distance between the axis of the threaded part and the flat surface is It can be made smaller than. That is, it is possible to reduce the radius of rotation when rotating the penetrating portion so that the flat surface facing the first flange stands up with respect to the first flange. Therefore, it is possible to prevent the penetrating portion from interfering with the through hole. As a result, it becomes possible to shorten construction time.

Further, according to the first to fifth inventions, the enlarged diameter portion has a flat surface formed on the side surface. Thereby, the radius of rotation when rotating the penetrating portion can be reduced. Therefore, the distance from the first locking part to the second locking part can be made smaller than before. Therefore, when the head is screwed into the threaded part after the flange of the liner plate is sandwiched between the enlarged diameter part and the second locking part, the number of rotations of the head which is threaded into the threaded part can be reduced. . As a result, it becomes possible to shorten the construction time.

In particular, according to the second aspect of the invention, the head and the enlarged diameter part of the first locking part are integrated. Accordingly, when rotating the penetrating portion so that the flat surface facing the first flange stands up with respect to the first flange, the operator only needs to hold at least one of the head and the enlarged diameter portion. For this reason, it becomes possible to improve the ease of construction compared to the case where the head part and the enlarged diameter part are separated.

In particular, according to the second aspect of the invention, the head and the enlarged diameter part of the first locking part are integrated. Thereby, the bending moment M acting on the fastening fitting can be made larger than in the case where the head and the enlarged diameter portion are configured to be separable. Therefore, it is possible to suppress the inclination of the axis of the threaded portion.

In particular, according to the third invention, the flat surface is formed by cutting out a part of the enlarged diameter portion, which is circular in plan view, in a straight line. Thereby, a part of the flange portion of a ready-made flanged nut having a circular shape in plan view can be cut out and used as the first locking portion. Furthermore, a partially cut out part of a ready-made washer having a circular shape in plan view can be used as the enlarged diameter portion. Therefore, it is only necessary to partially process the ready-made product, and it is possible to improve the ease of manufacturing the fastening fitting.

In particular, according to the fifth invention, the normal direction of the flat surface 32 is arranged in a direction different from the extending direction of the second locking part. Thereby, compared to the case where the normal direction and the extending direction of the second locking part are the same direction, it is possible to suppress the penetration part from falling off from the through hole. Therefore, it becomes possible to more firmly connect the steel members together.

In particular, according to the sixth to seventh inventions, in the piercing step, the second locking portion is passed through the first through hole and the second through hole with the flat surface facing the first steel member, and the flat surface is The penetrating portion is rotated so that the surface stands up with respect to the first steel member. As a result, when the second locking part is passed through the through hole, the normal direction of the flat surface and the extending direction of the second locking part are the same direction, and the distance between the axis of the threaded part and the flat surface is It can be made smaller than. That is, it is possible to reduce the radius of rotation when rotating the penetrating portion so that the flat surface facing the first flange stands up with respect to the first flange. Therefore, it is possible to prevent the penetrating portion from interfering with the through hole. As a result, it becomes possible to shorten construction time.

Further, according to the sixth to seventh inventions, in the piercing step, the second locking portion is passed through the first through hole and the second through hole with the flat surface facing the first steel member, and the flat surface is The penetrating portion is rotated so that the surface stands up with respect to the first steel member. Thereby, the radius of rotation when rotating the penetrating portion can be reduced. Therefore, the distance from the first locking part to the second locking part can be made smaller than before. Therefore, when the head is screwed into the threaded part after the flange of the liner plate is sandwiched between the enlarged diameter part and the second locking part, the number of rotations of the head which is threaded into the threaded part can be reduced. . As a result, it becomes possible to shorten the construction time.

In particular, according to the seventh invention, after performing the penetration process on each of the fastening metal fittings using a plurality of fastening metal fittings, the fastening process is performed on each of the fastening metal fittings. Thereby, when tightening steel members using a plurality of fastening fittings, it is possible to shorten the time required for changeover when tightening the fastening fittings using an impact wrench or the like. Therefore, it becomes possible to significantly shorten the construction time.

FIG. 1 is a perspective view showing an example of a fastening structure for steel members according to the first embodiment. FIG. 2(a) is a front view showing an example of the fastening structure of the steel member according to the first embodiment, and FIG. 2(b) is a side view thereof. FIG. 3(a) is a side view showing an example of the fastening fitting according to the first embodiment, and FIG. 3(b) is a plan view thereof. FIGS. 4(a) and 4(b) are front views showing a penetration step in an example of a method for fastening steel members. FIG. 5(a) is a front view showing a state before the steel members are sandwiched and fastened by the first locking part and the second locking part in the fastening method for steel members, and FIG. It is a front view which shows the state after clamping and tightening by the 1st locking part and the 2nd locking part in the tightening method of a member. FIG. 6 is a perspective view showing an example of a fastening structure for steel members according to the first embodiment. FIG. 7 is a front view showing an example of the fastening structure of the steel member according to the first embodiment, and FIG. 7(a) is a view showing an example in which the head and the enlarged diameter part are configured to be separable. FIG. 7(b) is a diagram showing an example in which the head and the enlarged diameter portion are integrated. FIG. 8 is a perspective view showing an example of a fastening structure for steel members according to the second embodiment. FIG. 9(a) is a front view showing an example of a fastening structure of steel members according to the second embodiment, and FIG. 9(b) is a side view thereof. FIGS. 10(a) and 10(b) are front views showing a penetration step in an example of a method for fastening steel members. FIG. 11(a) is a front view showing the state before the steel members are sandwiched and fastened by the first locking part and the second locking part in the fastening method for steel members, and FIG. It is a front view which shows the state after clamping and tightening by the 1st locking part and the 2nd locking part in the tightening method of a member. FIG. 12 is a perspective view showing an example of a fastening structure for steel members according to the third embodiment. FIG. 13(a) is a front view showing an example of a fastening structure of steel members according to the third embodiment, and FIG. 13(b) is a bottom view thereof. FIGS. 14(a) and 14(b) are front views showing a penetration step in an example of a method for fastening steel members. FIG. 15(a) is a front view showing the state before the steel members are sandwiched and fastened by the first locking part and the second locking part in the fastening method for steel members, and FIG. It is a front view which shows the state after clamping and tightening by the 1st locking part and the 2nd locking part in the tightening method of a member. FIG. 16 is a perspective view showing an example of a fastening structure for steel members according to the fourth embodiment. FIG. 17(a) is a front view showing an example of a fastening structure of steel members according to the fourth embodiment, and FIG. 17(b) is a bottom view thereof. FIGS. 18(a) and 18(b) are diagrams illustrating a method of tightening liner plates using a conventional tightening fitting.

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.

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

In the steel member fastening structure 100, a liner plate 9 is used as the steel member. The steel member fastening structure 100 is for fastening liner plates 9 having through holes 92 formed in flanges 91 to each other.

The liner plate 9 is constructed into a cylindrical shape by being tightly connected to other adjacent liner plates 9. The liner plate 9 constructed in a cylindrical shape is installed in a shaft, on the ground, etc., and is used as earth retaining when constructing deep foundation piles, water collection wells, underwater temporary cofferdams, bridge piers, and the like.

The liner plate 9 has a corrugated steel plate formed in a vertically corrugated shape, and flanges 91 at the upper end, lower end, and both side ends of the corrugated steel plate. A through hole 92 is formed in the flange 91 .

When the liner plate 9 has flanges 91 at the upper and lower ends of the corrugated steel plate as circumferential flanges, and flanges 91 at both ends of the corrugated steel plate as axial flanges, the fastening structure 100 of the steel members is arranged so that the flanges 91 at the upper and lower ends of the corrugated steel plate are axial flanges. In order to tightly connect the liner plates, circumferential flanges may be tightly connected to each other. Further, the steel member fastening structure 100 may be one in which axial flanges are fastened to each other in order to fasten liner plates adjacent to each other in the lateral direction.

The steel member fastening structure 100 includes a first liner plate 9-1, a second liner plate 9-2, and a fastening fitting 1.

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.

The fastening fitting 1 is for fastening the first liner plate 9-1 and the second liner plate 9-2. The fastening fitting 1 includes a penetrating portion 2 and a first locking portion 3.

The penetrating portion 2 is a rod-shaped member made of steel or the like and formed into a cylindrical shape or the like. The penetrating portion 2 is penetrated by the first through hole 92-1 and the second through hole 92-2. The penetrating portion 2 is provided with a first locking portion 3 screwed onto one end portion 2a side.

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

The penetrating portion 2 has a second locking portion 22 on the other end 2b side of the penetrating 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.

The first locking part 3 is screwed into the threaded part 29 on the one end 2a side of the penetrating part 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, for example, in a prismatic shape such as a hexagonal column shape.

The first locking portion 3 and the second locking portion 22 are tightly connected with the first flange 91-1 and the second flange 91-2 sandwiched therebetween. The first locking portion 3 is in contact with the first flange 91-1, and the second locking portion 22 is in contact with the second flange 91-2. Note that the first locking portion 3 may be in contact with the second flange 91-2, and the second locking portion 22 may be in contact with the first flange 91-1.

The first locking portion 3 is formed, for example, by partially cutting out a flange portion of a flanged nut. The first locking part 3 has a head 30 as a nut and an enlarged diameter part 31 as a flange formed to have a larger diameter than the head 30. That is, in the first locking portion 3, the head portion 30 and the enlarged diameter portion 31 are integrated. Since the first locking portion 3 can be screwed into 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 portion attached to the lower part of the nut, and plays the same role as a washer.

The enlarged diameter portion 31 has a flat surface 32 formed linearly in a plan view on a side surface. The flat surface 32 is formed by cutting out a part of the enlarged diameter portion 31, which is circular in plan view, in a straight line. The flat surface 32 is formed by cutting out a part of the flange portion of the flanged nut, which is circular in plan view.

Instead of a flanged nut, the first locking part 3 may be one in which a head 30 as a nut and an enlarged diameter part 31 as a washer are integrated by welding or the like. In this case, the flat surface 32 may be formed by cutting out a part of the circular washer in plan view.

Note that the head portion 30 and the enlarged diameter portion 31 of the first locking portion 3 may be made separable. In this case, the head 30 is, for example, a nut that can be screwed onto the threaded portion 29. For example, a washer whose diameter is larger than that of the head 30 is used as the enlarged diameter portion 31 .

Next, a method for fastening steel members will be explained. The method of connecting the steel members is to tightly connect the liner plates 9 having through holes 92 formed in the flanges 91, and the fastening fitting 1 is used. The method for tightening steel members includes a piercing step and a tightening step. In the method of fastening steel members, the first through hole 92-1 and the second through hole 92-2 are made to face each other in advance.

As shown in FIG. 4(a), in the penetration process, the distance H1 from the first locking part 3 to the second locking part 22 is the thickness t1 of the first flange 91-1 and the thickness t1 of the second flange 91-2. The head 30 and the enlarged diameter portion 31 are arranged in advance on the threaded portion 29 so that the diameter is larger than the sum of the thickness t2. At this time, the head 30 is screwed into the threaded portion 29.

Then, in the piercing step, the flat surface 32 is opposed to the first flange 91-1 of the first liner plate 9-1. At this time, the flat surface 32 is brought into contact with the first flange 91-1. In the penetrating step, the second locking portion 22 is passed through the first through hole 92-1 and the second through hole 92-2. When the second locking portion 22 is penetrated, the normal direction of the flat surface 32 and the extending direction of the second locking portion 22 become the same direction.

Next, as shown in FIG. 4(b), in the penetration step, the penetration portion 2 is rotated so that the flat surface 32 stands up with respect to the first flange 91-1. At this time, the distance L1 between the axis C1 of the threaded portion 29 and the flat surface 32 becomes the radius of rotation.

As shown in FIG. 5(a), in the penetrating step, the first flange 91-1 and the second flange 91 -2 is placed.

At this time, since the distance H1 from the first locking part 3 to the second locking part 22 is larger than the sum of the thickness t1 of the first flange 91-1 and the thickness t2 of the second flange 91-2, the penetration In the process, the first locking part 3 is locked to the first flange 91-1, and the second locking part 22 is separated from the second flange 91-2.

Further, the difference Δh 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 first flange 91-1 and the thickness t2 of the second flange 91-2, It is preferable that the difference Δh is smaller than the height h1 of the first locking portion 3, assuming that the height h1 of the first locking portion 3 is h1.

Next, as shown in FIG. 5(b), in the tightening step, the head 30 of the first locking part 3 is screwed into the threaded part 29 formed at one end 2a of the penetrating part 2. As a result, the second locking part 22 separated from the second flange 91-2 approaches the second flange 91-2, and the distance H1 from the first locking part 3 to the second locking part 22 gradually increases. The first flange 91-1 and the second flange 91-2 are sandwiched between the first locking part 3 and the second locking part 22 and are tightly connected.

In the tightening process, when the first locking part 3 is screwed into the threaded part 29, the first locking part 3 is held by a predetermined holding means such as a spanner, and the first locking part 3 is held in place. On the other hand, the head 30 of the first locking part 3 may be screwed into the threaded part 29 by rotating the threaded part 29 with an impact wrench or the like. In addition, in the tightening process, when screwing the head 30 of the first locking part 3 into the threaded part 29, while holding the penetrating part 2 with a cinch or the like, screw the head 30 of the first locking part 3. The first locking portion 3 may be screwed into the threaded portion 29 by rotating it relative to the portion 29 . In this way, by holding at least one of the first locking part 3 and the penetrating part 2, it is possible to prevent the first locking part 3 and the threaded part 29 from rotating together.

As shown in FIG. 6, in the tightening process, when rotating the head 30 of the first locking part 3 with respect to the threaded part 29, the other end 2b of the penetrating part 2 is connected to the second liner plate 9-2. It is preferable to rotate the first locking part 3 with respect to the threaded part 29 after contacting the first locking part 3 with the threaded part 29 . As a result, the other end 2b in contact with the steel member cannot rotate. Therefore, it is possible to prevent the first locking portion 3 and the threaded portion 29 from rotating together.

Further, as shown in FIG. 6, in the fastening process, the screwing is completed when the normal direction N of the flat surface 32 and the extending direction A of the second locking part 22 become different directions. is preferred. As a result, even if the first flange 91-1 and the second flange 91-2 try to separate due to an external force acting on the liner plate 9, the penetration part 2 is prevented from falling off from the through hole 92. can do.

In this way, in the tightening process, the first liner plate 9-1 and the second liner plate 9-2 are sandwiched between the first locking part 3 and the second locking part 22 and are tightly connected.

With the above, an example of the method for fastening steel members is completed.

In addition, in the method for fastening steel members, a plurality of fastening fittings 1 are used, and after performing a penetration process on each fastening fitting 1 one after another, the fastening process is performed all at once on each fastening fitting 1 for which the penetration process has been completed. You may go. Furthermore, in the method for fastening steel members, a plurality of fastening fittings 1 may be used, and the penetrating step and the fastening step may be repeated for each fastening fitting 1.

According to this embodiment, the enlarged diameter portion 31 has a flat surface 32 formed on the side surface. As a result, when the second locking part 22 is passed through the through hole 92, the normal direction of the flat surface 32 and the extending direction of the second locking part 22 become the same direction, and the axis C1 of the threaded part 29 and the flat The distance L1 to the surface 32 can be made smaller than before. That is, it is possible to reduce the radius of rotation when rotating the penetrating portion 2 so that the flat surface 32 facing the first flange 91-1 stands up with respect to the first flange 91-1. Therefore, it is possible to prevent the penetrating portion 2 from interfering with the through hole 92. As a result, it becomes possible to shorten construction time.

Further, according to this embodiment, the expanded diameter portion 31 has a flat surface 32 formed on the side surface. Thereby, the radius of rotation when rotating the penetrating portion 2 can be reduced. Therefore, the distance H1 from the first locking part 3 to the second locking part 22 can be made smaller than before. Therefore, when the head 30 is screwed into the threaded part 29 after the flange 91 of the liner plate 9 is sandwiched between the enlarged diameter part 31 and the second locking part 22, the head 30 which is threaded into the threaded part 29 is The rotation speed can be reduced. As a result, it becomes possible to shorten the construction time.

Here, the first flange 91-1 and the second flange 91-2 may tend to separate due to an external force acting on the liner plate 9. In this case, when the first locking part 3 and the second locking part 22 sandwich and tighten the adjacent first flange 91-1 and second flange 91-2, the penetration part There is concern that 2 will be dropped. In this regard, according to the present embodiment, when the first locking part 3 and the second locking part 22 are tightly connected with the flange 91 in between, the normal direction N of the flat surface 32 is It is arranged in a direction different from the extending direction A of the locking part 22. Thereby, compared to the case where the normal direction N and the extending direction A of the second locking part 22 are the same direction, it is possible to suppress the penetration part 2 from falling off from the through hole 92. Therefore, it becomes possible to more firmly connect the liner plates 9 to each other.

According to this embodiment, the flat surface 32 is formed by cutting out a part of the enlarged diameter portion 31, which is circular in plan view, in a linear shape. Thereby, a part of the flange portion of a ready-made flanged nut having a circular shape in plan view can be cut out and used as the first locking portion 3. Furthermore, a partially cut out part of a ready-made washer having a circular shape in plan view can be used as the enlarged diameter portion 31. Therefore, it is only necessary to partially process the ready-made product, and it is possible to improve the ease of manufacturing the fastening fitting 1.

Further, according to the present embodiment, after performing a penetration process on each of the fastening metal fittings 1 using a plurality of fastening metal fittings 1, a fastening process is performed on each of the fastening metal fittings 1. Thereby, when a plurality of fastening fittings 1 are used to fasten steel members, it is possible to shorten the time required for changeover when fastening the fastening fittings 1 using an impact wrench or the like. Therefore, it becomes possible to significantly shorten the construction time.

According to this embodiment, the first locking portion 3 has a head portion 30 and an enlarged diameter portion 31 integrated. As a result, when rotating the penetrating portion 2 so that the flat surface 32 facing the first flange 91-1 stands up with respect to the first flange 91-1, the operator can rotate the head 30 and the enlarged diameter portion 31. It is sufficient to retain at least one of them. For this reason, it becomes possible to improve the ease of construction compared to the case where the head 30 and the enlarged diameter portion 31 are separated.

As shown in FIG. 7, the distance from the axis C1 of the threaded portion 29 to the circumferential edge of the head 30 is D1, and the distance from the axis C1 of the threaded portion 29 to the curved surface of the enlarged diameter portion 31 is D2. At this time, D1<D2 is satisfied. If the head 30 is screwed into the threaded portion 29 too much, the second locking portion 22 that was in contact with the second flange 91-2 will shift with respect to the second flange 91-2, and the axis C1 may become oblique, but in this case, a bending moment M acts to suppress the inclination of the axis C1.

As shown in FIG. 7(a), when the head 30 and the enlarged diameter part 31 are configured to be separable, when an external force or the like acts on the steel member, the head 30 and the enlarged diameter part 31 are separated. Then, it tries to be pulled out using point B1 of the head 30 as a fulcrum. Therefore, the bending moment M-1 is expressed as the product of the pull-out force acting on the axis C1 of the threaded portion 29 and the distance D1. On the other hand, as shown in FIG. 7(b), when the head 30 and the enlarged diameter part 31 are integrated, when an external force or the like acts on the steel member, the head 30 and the enlarged diameter part Since the part 31 is integral with the part 31, the part 31 tends to be pulled out using the point B2 of the enlarged diameter part 31 as a fulcrum. Therefore, the bending moment M-2 is expressed as the product of the pull-out force acting on the axis C1 of the threaded portion 29 and the distance D2. Since D1<D2, the bending moment M-2 in the case where the head 30 and the enlarged diameter part 31 are configured in an integrated manner is that the head 30 and the enlarged diameter part 31 are configured to be separable. The bending moment M-1 can be made larger than the bending moment M-1 in the case.

Therefore, according to this embodiment, in the first locking portion 3, the head portion 30 and the enlarged diameter portion 31 are integrated. Thereby, 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. Therefore, it is possible to suppress the inclination of the axis C1 of the threaded portion 29.

Further, according to the present embodiment, the first steel member and the second steel member are the liner plate 9 having the flange 91 in which the through hole 92 is formed. This makes it possible to construct a structure such as an earth retaining wall in which the liner plates 9 are tied together.

In particular, according to the present embodiment, in the penetration step, the second locking portion 22 is inserted into the first through hole 92-1 and the second through hole 92-2 with the flat surface 32 facing the first flange 91-1. The penetrating portion 2 is rotated so that the flat surface 32 stands up against the first flange 91-1. As a result, when the second locking part 22 is passed through the through hole 92, the normal direction of the flat surface 32 and the extending direction of the second locking part 22 become the same direction, and the axis C1 of the threaded part 29 and the flat The distance L1 to the surface 32 can be made smaller than before. That is, it is possible to reduce the radius of rotation when rotating the penetrating portion 2 so that the flat surface 32 facing the first flange 91-1 stands up with respect to the first flange 91-1. Therefore, it is possible to prevent the penetrating portion 2 from interfering with the through hole 92. As a result, it becomes possible to shorten construction time.

Further, according to the present embodiment, in the penetration step, the second locking portion 22 is attached to the first through hole 92-1 and the second through hole 92-2 with the flat surface 32 facing the first flange 91-1. The penetrating portion 2 is rotated so that the flat surface 32 stands up against the first flange 91-1. Thereby, the radius of rotation when rotating the penetrating portion 2 can be reduced. Therefore, the distance H1 from the first locking part 3 to the second locking part 22 can be made smaller than before. Therefore, when the head 30 is screwed into the threaded part 29 after the flange 91 of the liner plate 9 is sandwiched between the enlarged diameter part 31 and the second locking part 22, the head 30 which is threaded into the threaded part 29 is The rotation speed can be reduced. As a result, it becomes possible to shorten the construction time.

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

In the steel member fastening structure 100, a corrugated steel plate 90 is used as the steel member. The steel member fastening structure 100 is for fastening corrugated steel plates 90 having through holes 92 formed at their ends.

The corrugated steel plate 90 is tightly connected to other adjacent corrugated steel plates 90 and is constructed to have a U-shaped cross section or the like. A corrugated steel plate 90 constructed in a U-shape is installed on the ground or the like and used as a waterway or the like.

The corrugated steel plate 90 is formed into a corrugated shape in which peaks 94 and valleys 95 are repeatedly formed, and through holes 92 are formed at the ends of the peaks 94. The ends of the plurality of corrugated steel plates 90 are overlapped with each other and are tightly connected to each other by the fastening fitting 1. In the second embodiment, a configuration in which the through hole 92 is formed in the peak portion 94 will be described, but the through hole 92 may be formed in the trough portion 95 and fastened by the fastening fitting 1.

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

Next, a method for fastening steel members will be explained. The method for connecting steel members is to tightly connect corrugated steel plates 90 in which through holes 92 are formed, and a fastening fitting 1 is used. The method for tightening steel members includes a piercing step and a tightening step. In the method of fastening steel members, the first through hole 92-1 and the second through hole 92-2 are made to face each other in advance.

As shown in FIG. 10(a), in the penetration process, the distance H1 from the first locking part 3 to the second locking part 22 is the thickness t1 of the first corrugated steel plate 90-1 and the second corrugated steel plate 90- The head 30 and the enlarged diameter part 31 are arranged in advance on the threaded part 29 so that the thickness is larger than the sum of the thickness t2 and the thickness t2. At this time, the head 30 is screwed into the threaded portion 29.

Then, in the penetration process, the flat surface 32 is made to face the first corrugated steel plate 90-1. At this time, the flat surface 32 is brought into contact with the first corrugated steel plate 90-1. In the penetrating step, the second locking portion 22 is passed through the first through hole 92-1 and the second through hole 92-2.

Next, as shown in FIG. 10(b), in the penetration step, the penetration portion 2 is rotated so that the flat surface 32 stands up against the first corrugated steel plate 90-1. At this time, the distance L1 between the axis C1 of the threaded portion 29 and the flat surface 32 becomes the radius of rotation.

As shown in FIG. 11(a), in the penetration process, the first corrugated steel plate 90-1 and the second corrugated steel plate A steel plate 90-2 is placed.

At this time, because the distance H1 from the first locking part 3 to the second locking part 22 is larger 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. In the penetrating step, 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.

Also, the difference Δh 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 first corrugated steel plate 90-1 and the thickness t2 of the second corrugated steel plate 90-2. The difference Δh is preferably smaller than the height h1 of the first locking portion 3, assuming that the height h1 of the first locking portion 3 is h1.

Next, as shown in FIG. 11(b), in the tightening step, the head 30 of the first locking part 3 is screwed into the threaded part 29 formed at one end 2a of the penetrating part 2. As a result, the second locking portion 22 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 increases. gradually becomes smaller, and the first corrugated steel plate 90-1 and the second corrugated steel plate 90-2 are sandwiched between the first locking part 3 and the second locking part 22 and are tightly connected.

In this way, in the tightening process, the first corrugated steel plate 90-1 and the second corrugated steel plate 90-2 are sandwiched between the first locking part 3 and the second locking part 22 and are tightly connected.

In particular, according to this embodiment, the first steel member and the second steel member are corrugated steel plates 90 in which through holes 92 are formed. Thereby, it becomes possible to construct a structure in which the corrugated steel plates 90 are tightly connected.

(Third embodiment)
Next, a steel member fastening structure 100 according to a third embodiment will be described. FIG. 12 is a perspective view showing an example of a fastening structure 100 for steel members according to the third embodiment. FIG. 13(a) is a side view showing an example of a fastening structure 100 for steel members according to the third embodiment, and FIG. 13(b) is a bottom view thereof.

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 steel member fastening structure 100 is for fastening the steel plate 8-1 and the support column 8-2.

The steel plate 8-1 is tightly connected to the adjacent support column 8-2. The steel plate 8-1 is a bent steel plate, and the portion that contacts the support column 8-2 is curved. A second through hole 82-2 is formed in a portion of the steel plate 8-1 that contacts the support column 8-2. The steel plate 8-1 has holes formed at both ends, and a connection fitting is used through which a fence panel such as a guard fence (not shown) can be connected.

The support column 8-2 is formed into a cylindrical shape with a circular cross section or the like, and its lower end is fixed to the ground. The pillar 8-2 has a second through hole 82-2 formed in the side wall portion, and no through hole is formed at a position facing the second through hole 82-2.

A fastening structure 100 for steel members includes a steel plate 8-1, a support 8-2, and a fastening fitting 1.

Next, a method for fastening steel members will be explained. The method for connecting steel members is to tightly connect the steel plate 8-1 in which the first through hole 82-1 is formed and the support 8-2 in which the second through hole 82-2 is formed, A fastening fitting 1 is used. The method for tightening steel members includes a piercing step and a tightening step. In the method of fastening steel members, the first through hole 82-1 and the second through hole 82-2 are made to face each other in advance.

As shown in FIG. 14(a), in the penetration process, the distance H1 from the first locking part 3 to the second locking part 22 is the sum of the thickness t1 of the steel plate 8-1 and the thickness t2 of the support column 8-2. The head 30 and the enlarged diameter part 31 are arranged in advance on the threaded part 29 so that the diameter is larger than the sum of the parts. At this time, the head 30 is screwed into the threaded portion 29.

Then, in the penetration process, the flat surface 32 is made to face the steel plate 8-1. At this time, the flat surface 32 is brought into contact with the steel plate 8-1. In the penetrating step, the second locking portion 22 is passed through the first through hole 82-1 and the second through hole 82-2.

Next, as shown in FIG. 14(b), in the penetration step, the penetration portion 2 is rotated so that the flat surface 32 stands up against the steel plate 8-1. At this time, the distance L1 between the axis C1 of the threaded portion 29 and the flat surface 32 becomes the radius of rotation.

As shown in FIG. 15(a), in the penetration process, a steel plate 8-1 and a support column 8-2 are inserted between the enlarged diameter part 31 of the first locking part 3 and the second locking part 22. Deploy.

At this time, since the distance H1 from the first locking part 3 to the second locking part 22 is larger than the sum of the thickness t1 of the steel plate 8-1 and the thickness t2 of the support column 8-2, the The first locking portion 3 is locked to the steel plate 8-1, and the second locking portion 22 is separated from the support column 8-2.

Further, the difference Δh 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, When the height h1 of the portion 3 is assumed, the difference Δh is preferably smaller than the height h1 of the first locking portion 3.

Next, as shown in FIG. 15(b), in the tightening step, the head 30 of the first locking part 3 is screwed into the threaded part 29 formed at one end 2a of the penetrating part 2. As a result, the second locking portion 22 separated from the support 8-2 approaches the support 8-2, and the distance H1 from the first locking portion 3 to the second locking portion 22 gradually decreases. The steel plate 8-1 and the support column 8-2 are sandwiched between the first locking part 3 and the second locking part 22 and are tightly connected.

In this way, in the tightening process, the steel plate 8-1 and the support column 8-2 are sandwiched between the first locking part 3 and the second locking part 22 and are tightly connected.

In particular, according to the present embodiment, the first steel member is the steel plate 8-1, and the second steel member is the column-shaped support 8-2. This makes it possible to construct a structure in which the steel plate 8-1 and the support column 8-2 are tightly connected.

(Fourth embodiment)
Next, a steel member fastening structure 100 according to a fourth embodiment will be described. FIG. 16 is a perspective view showing an example of a fastening structure 100 for steel members according to the fourth embodiment. FIG. 17(a) is a front view showing an example of a fastening structure 100 for steel members according to the fourth embodiment, and FIG. 17(b) is a bottom view thereof.

In this embodiment, a channel steel 7-1 is used as the first steel member, and a cylindrical support 7-2 is used as the second steel member. The steel member fastening structure 100 is for fastening the channel steel 7-1 and the support column 7-2.

The channel steel 7-1 is tightly connected to the adjacent column 7-2. For example, a lip channel steel is used as the channel steel 7-1. The channel steel 7-1 has a U-shaped cross section and includes a pair of flanges and a web connecting the pair of flanges. A first through hole 72-1 is formed in the web of the channel steel 7-1. The channel steel 7-1 is used, for example, as a rim of a structure.

The support column 7-2 is formed into a cylindrical shape with a rectangular cross section or the like, and its lower end is fixed to the ground. The pillar 7-2 has a second through hole 72-2 formed in a side wall portion, and no through hole is formed at a position opposite to the second through hole 72-2.

In particular, according to the present embodiment, the first steel member is the channel steel 7-1, and the second steel member is the column-shaped support 7-2. This makes it possible to construct a structure in which the channel steel 7-1 and the support column 7-2 are tightly connected.

In the present invention, the steel member may be used for fastening together steel sections such as H-section steel, angle steel, and channel steel.

The present invention is effective in places where it is difficult to reach the back of a steel member and where it is difficult to attach a nut, or where fastening is required in a short time.

Although some 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. Moreover, these embodiments can be implemented in combination as appropriate. Furthermore, this invention can be implemented in various new forms in addition to the several embodiments described above. Therefore, various omissions, substitutions, and changes can be made to each of the several embodiments described above without departing from the gist of the present invention. Such novel forms and modifications are included within the scope and gist of this invention, as well as within the scope of the claimed inventions and equivalents of the claimed inventions.

100 : Fastening structure of steel members 1 : Fastening fitting 2 : Penetrating part 2a : One end part 2b : Other end part 22 : Second locking part 29 : Screw part 3 : First locking part 30 : Head 31 : Expansion Diameter portion 32: Flat surface 8-1: Steel plate 82-1: First through hole 8-2: Support column 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 90: Corrugated steel plate 90-1: First corrugated steel plate 90-2: Second corrugated steel plate 92: Through hole 92-1: First through hole Hole 92-2: Second through hole 94: Peak 95: Valley

Claims (7)

A fastening fitting for fastening together steel members in which through holes are formed,
a penetrating portion that can be penetrated into each through hole formed in an adjacent steel member;
a first locking part having a head that can be screwed onto one end of the through-hole and an enlarged-diameter part formed to have a larger diameter than the through-hole;
The penetration part is
a threaded portion on one end side of which the first locking portion is screwed;
a second locking part extending orthogonally to the threaded part,
The fastening fitting is characterized in that the enlarged diameter portion has a flat surface formed on a side surface. The fastening fitting according to claim 1, wherein in the first locking portion, the head portion and the enlarged diameter portion are integrated. The fastening fitting according to claim 1 or 2, wherein the flat surface is formed by cutting out a part of the enlarged diameter portion, which is circular in plan view, in a straight line. A steel member fastening structure that fastens 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;
comprising a fastening fitting for fastening the first steel member and the second steel member,
The fastening fitting is
a penetrating portion penetrated by the first through hole and the second through hole;
a head provided on one end side of the penetrating portion; an enlarged diameter portion disposed between the head and the first steel member and formed to have a larger diameter than the first through hole; a first locking part having a
The penetration part is
a screw portion into which the head is screwed onto one end side;
a second locking part extending orthogonally to the threaded part,
The first locking part and the second locking part are tightly connected with the adjacent first steel member and the second steel member sandwiched therebetween,
A fastening structure for steel members, characterized in that the enlarged diameter portion has a flat surface formed on a side surface. The fastening structure for steel members according to claim 4, wherein the normal direction of the flat surface is arranged in a direction different from the extending direction of the second locking part. A method for fastening steel members in which a through hole is formed, the method comprising:
A penetration portion that is penetrated by 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 part having a head screwable to one end of the penetrating part, and an enlarged diameter part having a flat surface on a side surface and having a diameter larger than that of the first through hole. and,
The penetration part is
a screw portion into which the head is screwed onto one end side;
using a fastening fitting having a second locking part extending perpendicularly to the threaded part,
The head and the enlarged diameter portion are arranged in advance on the threaded portion, and the second engagement is inserted into the first through hole and the second through hole with the flat surface facing the first steel member. The first steel member is inserted through the stopper and rotated so that the flat surface stands up against the first steel member. a penetrating step of arranging the steel member and the second steel member;
A fastening step of sandwiching and tightening the first steel member and the second steel member between the first locking portion and the second locking portion by screwing the head into the screw portion. A method for fastening steel members, comprising: The method for fastening steel members according to claim 6, characterized in that, after performing the piercing step for each of the fastening metal fittings using a plurality of the fastening metal fittings, the fastening step is performed for each of the fastening metal fittings. .

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