Reinforcement structure and reinforcement method

Abstract

To easily suppress welding effects on surroundings and achieve improvement in reinforcement effect.SOLUTION: A reinforcement structure comprises: a steel material; a plate material which is attached to the steel material and has an open hole penetrating in a thickness direction; and a welded member which is stud-welded to the steel material in the open hole. The welded member is integrated with an inner peripheral surface of the open hole by a molten metal, and although a thickness of the welded member is a thickness or less of the plate material, by repeating similar welding, plug welding for filling all gaps between the open hole and the welded member (and a rod stock) even for members with plate thickness can be completed. The molten metal blocks the gap between the open hole and the welded member (and the rod stock), whereby structural loss that has been generated in the past due to the gap remaining until reinforcement has exhibited effectiveness, is eliminated, and significant structural merits are yielded.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a reinforcement structure and a reinforcement method. [Background technology]

[0002] When reinforcing a steel structure (steel material), welding work is generally performed. Such welding work is performed by a welding device such as that disclosed in Patent Document 1, for example. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2016-68089 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, welding work using such welding equipment generates sparks, odors, dust, etc., which may lead to fires caused by sparks, odors that may cause trouble for third parties, health hazards caused by dust, etc. In addition, when protective measures are required, fairly large-scale protective measures are required, and reinforcement takes time and effort.

[0005] Furthermore, when reinforcing a steel structure (steel material) by welding the tip of a bar material to the steel structure (steel material) and inserting the bar material through an insertion hole in the reinforcing plate (plate material) to attach the reinforcing plate, the insertion hole needs to be formed with a diameter larger than that of the bar material, taking into consideration manufacturing errors, installation errors, etc. For this reason, a gap is generated between the insertion hole and the bar material, which may reduce the effectiveness of the reinforcing material.

[0006] The present invention has been made in consideration of the above problems, and an object of the present invention is to easily suppress the influence of welding on the surroundings and to improve the reinforcing effect. [Means for solving the problem]

[0007] The main invention for achieving the above object comprises a steel material, a plate material attached to the steel material and having a through hole penetrating in the thickness direction, and a welded member stud-welded to the steel material in the through hole, the welded member being integrated with an inner peripheral surface of the through hole via molten metal, and the thickness of the welded member being equal to or smaller than the thickness of the plate material. The welded member includes a first welded member stud-welded to the steel material, and a second welded member stud-welded to the first welded member. This is a reinforcing structure characterized by the above.

[0008] Other features of the present invention will become apparent from the following detailed description of the present invention and the accompanying drawings. Effect of the Invention

[0009] According to the present invention, the influence of welding on the surroundings can be easily suppressed and the reinforcing effect can be improved. [Brief description of the drawings]

[0010] [Figure 1] 1A and 1B are schematic explanatory diagrams of the reinforcing structure of this embodiment. [Diagram 2] FIG. 2 is a perspective view of a cylindrical ferrule 30. [Diagram 3] FIG. 2 is a side view of the stud piece 100 and the retaining member 200. [Figure 4] 4A to 4E are explanatory diagrams of a reinforcing method for forming the reinforcing structure of this embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] At least the following matters will become apparent from this specification and the accompanying drawings.

[0012] A reinforcement structure has been revealed which comprises a steel material, a plate material attached to the steel material and having a through hole penetrating in the thickness direction, and a welded member stud-welded to the steel material in the through hole, wherein the welded member is integrated with the inner surface of the through hole via molten metal, and the thickness of the welded member is equal to or less than the thickness of the plate material.

[0013] According to this type of reinforcement structure, a welded member is formed in the through hole that is equal to or smaller than the thickness of the plate material (in other words, stud welding is performed in the through hole), which makes it possible to suppress the diffusion of sparks, odors, dust, etc. Also, the steel material, plate material, and welded member can be joined without gaps, which eliminates the structural loss that conventionally occurs due to gaps that exist before the reinforcement effect is realized, resulting in significant structural benefits. Therefore, it is possible to easily suppress the impact of welding on the surroundings and improve the reinforcing effect.

[0014] In such a reinforcement structure, it is desirable that the welded member includes a first welded member stud-welded to the steel material, and a second welded member stud-welded to the first welded member.

[0015] With this type of reinforcement structure, by repeating stud welding, it is possible to complete plug welds that fill all of the gaps with the through holes, even in members with a large plate thickness.

[0016] In such a reinforcing structure, it is preferable that a groove is formed on the inner peripheral surface of the through hole, and the groove is filled with molten metal.

[0017] Such a reinforcing structure can achieve better integration.

[0018] It is desirable for such a reinforcing structure to have a bar material stud-welded to the welded member in the through hole, and for molten metal to be filled in a gap between the bar material and the through hole.

[0019] According to this type of reinforcing structure, the plate material and the bar material can be integrated without any gaps.

[0020] It is desirable for such a reinforcing structure to have a fastener that screws into the bar and presses the plate against the steel.

[0021] According to such a reinforcing structure, the steel material and the plate material can be integrated.

[0022] Also, a reinforcement method for reinforcing steel material with a plate material has the steps of: a through hole forming step of forming a through hole in the plate material that penetrates through the thickness direction of the plate material; a plate material attachment step of attaching the plate material with the through hole formed therein to the steel material; a welding step of inserting a stud welding member into the through hole while holding it with a retaining member and stud welding it; and a retaining member removal step of removing the retaining member after the welding step, characterized in that the reinforcement method forms a welded member that is integrated with the inner surface of the through hole via molten metal and has a thickness less than or equal to the thickness of the plate material.

[0023] According to this reinforcement method, the influence of welding on the surroundings can be easily suppressed and the reinforcement effect can be improved.

[0024] In such a reinforcement method, the welding process and the retaining member removal process may be repeatedly performed a plurality of times, and the welded members may include a first welded member in which the stud welding member is stud welded to the steel material, and a second welded member in which the stud welding member is stud welded to the first welded member.

[0025] According to this type of reinforcement method, by repeating stud welding multiple times, it is possible to complete plug welds that fill all of the gaps with the through holes, even in members with a large plate thickness.

[0026] In such a reinforcement method, it is preferable that in the welding step, a cylindrical ferrule is inserted into the through hole, and the stud welding member and the holding member are inserted into the cylindrical ferrule to perform stud welding.

[0027] According to this reinforcing method, the diffusion of sparks, odors, dust, etc. can be further suppressed during stud welding.

[0028] In such a reinforcement method, the cylindrical ferrule has a helical protrusion on its outer peripheral surface, and a groove portion corresponding to the protrusion is provided on the inner peripheral surface of the through hole, and the welding step and the retaining member removal step are repeatedly performed a plurality of times, and the position of the cylindrical ferrule is changed in each of the plurality of welding steps, and it is desirable that the molten metal generated by the stud welding is also filled into the groove portion.

[0029] Such a reinforcing method can achieve better integration.

[0030] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0031] ===This embodiment=== <Reinforcement structure>

[0032] 1A and 1B are schematic explanatory diagrams of the reinforcement structure of this embodiment. Fig. 1A shows an example of the reinforcement structure, and Fig. 1B shows a diagram (final shape) in which further members are added to Fig. 1A. Fig. 1A is a cross-sectional view, and Fig. 1B is an elevation view.

[0033] 1A and 1B, the reinforcement structure of this embodiment includes a steel material 2, a reinforcing plate 4, a stud bolt 10, a washer 12, a nut 14, and a welding member 110. In this embodiment, the steel material 2 and the reinforcing plate 4 are arranged perpendicular to the up-down direction. That is, the thickness direction of the steel material 2 and the reinforcing plate 4 is along the up-down direction. In the following description, the up-down direction is also referred to as the thickness direction.

[0034] The steel material 2 is a steel member (for example, H-beam, steel plate, etc.) that constitutes a building or the like, and is a member to be reinforced in this embodiment.

[0035] The reinforcing plate 4 (corresponding to a plate material) is a steel plate material for reinforcing the steel material 2, and is attached to the steel material 2 so that the upper surface is in contact with the lower surface of the steel material 2. As shown in the figure, the thickness of the reinforcing plate 4 in this embodiment is greater than the thickness of the steel material 2. Also, a through hole 4a is formed in the reinforcing plate 4 in the thickness direction. The through hole 4a in this embodiment is a bolt hole with a screw portion 4b (female screw: corresponding to a groove portion) formed in a spiral shape on the inner circumferential surface. The screw portion 4b of the through hole 4a (bolt hole) is formed so as to be able to be screwed into the screw portion 30b of a cylindrical ferrule 30 (described later).

[0036] The stud bolt 10 (corresponding to a rod material) is a member (bolt) whose tip (upper end) is formed so as to be stud weldable, and has a substantially cylindrical shaft portion 10a and a screw portion 10b (male screw) formed in a spiral shape on the outer circumferential surface of the shaft portion 10a. In this embodiment, the stud bolt 10 is stud welded to a welding member 110 provided in the through hole 4a. Note that stud welding is a welding method in which, with the tip of a stud material (bolt, pin member, etc.) pressed against a base material (steel material, etc.), an electric current is passed between the base material and the stud material to generate a spark (arc) to melt and join them.

[0037] The washer 12 is interposed between the reinforcing plate 4 and the nut 14. In addition, the stud bolt 10 is inserted through the washer 12.

[0038] The nut 14 is a member that is screwed onto the stud bolt 10 to press the reinforcing plate 4 against the steel material 2 via the washer 12.

[0039] The welded member 110 is a portion formed by stud-welding a stud piece 100, described later, inside the through hole 4a of the reinforcing plate 4. The welded member 110 of this embodiment is formed by three layers of welded members (first welded member 101, second welded member 102, third welded member 103) corresponding to the stud piece 100 stacked one on top of the other. Of these, the first welded member 101 is stud-welded to the steel material 2, and the second welded member 102 is stud-welded to the first welded member 101. Furthermore, the third welded member 103 is stud-welded to the second welded member 102. The first welded member 101, second welded member 102, and third welded member 103 each have the stud piece 100 and molten metal M produced by stud welding.

[0040] Moreover, the welded members 110 (first welded member 101, second welded member 102, third welded member 103) are integrated with the inner circumferential surface of the through hole 4a via the molten metal M. The molten metal M is also filled into the threaded portion 4b of the through hole 4. In this way, since there is no gap (no play) between the through hole 4a (reinforcing plate 4) and the welded members 110, the steel material 2, the reinforcing plate 4, and the welded members 110 can be integrated, and the reinforcing effect can be enhanced.

[0041] In addition, the thickness of the welded member 110 is equal to or less than the thickness of the reinforcing plate 4. Therefore, by using a cylindrical ferrule 30 (described later) or the like, it is possible to suppress the diffusion of sparks, odors, dust, and the like that are generated during stud welding.

[0042] <Materials used during welding> Next, the members (the cylindrical ferrule 30, the stud piece 100, and the holding member 200) used during welding in this embodiment will be described.

[0043] FIG. 2 is a perspective view of the cylindrical ferrule 30. As shown in FIG.

[0044] The cylindrical ferrule 30 is a ferrule having a substantially cylindrical shape, and is made of heat-resistant porcelain (e.g., ceramic). The cylindrical ferrule 30 has a function of suppressing the diffusion of sparks, odors, dust, etc., generated during stud welding. The cylindrical ferrule 30 of this embodiment has a cylindrical portion 30a, a threaded portion 30b, and a notched portion 30c.

[0045] The tubular portion 30a is a cylindrical portion that forms the main body of the tubular ferrule 30. The outer diameter of the tubular portion 30a is approximately equal to the diameter of the through hole 4a of the reinforcing plate 4 and the diameter of the stud bolt 10, and the inner diameter of the tubular portion 30a is large enough to allow the stud piece 100 and the holding member 200 to be inserted therethrough.

[0046] The threaded portion 30b (corresponding to the protruding portion) is a screw (male screw) formed in a spiral shape on the outer circumferential surface of the cylindrical portion 30a. The threaded portion 30b is formed so as to be able to be screwed into the threaded portion 4b (female screw) of the through hole 4a of the reinforcing plate 4.

[0047] The cutouts 30c are grooves formed for releasing gas during stud welding, and are provided vertically through the threaded portion 30b. The cutouts 30c are not continuous from the upper end to the lower end of the tubular portion 30a, but are formed at different circumferential positions. This makes it possible to release gas during stud welding, and also prevents leakage of the molten stud piece 100 (such as the first welded member 101).

[0048] FIG. 3 is a side view of the stud piece 100 and the retaining member 200.

[0049] The stud piece 100 is a disk-shaped member that can be stud-welded, and is connected to the tip of the retaining member 200. The thickness of the stud piece 100 is smaller than the thickness of the reinforcing plate 4, and is about 2 cm in this embodiment. The diameter of the stud piece 100 is also smaller than the diameter of the through hole 4a.

[0050] The holding member 200 is a member that holds the stud piece 100 when stud welding is performed, and in this embodiment is provided in a cylindrical (rod-like) shape with the same diameter as the stud piece 100. Furthermore, the holding member 200 is formed from a conductor that can carry the electricity required for stud welding.

[0051] The stud piece 100 and the retaining member 200 are connected in a manner that allows them to be separated (removed). For example, they may be screwed together with a screw, or the connected portion may be broken by applying a load (rotational torque, tensile force, etc.).

[0052] <Reinforcement method> 4A to 4E are explanatory diagrams of a reinforcing method for forming the reinforcing structure of this embodiment.

[0053] First, a through hole 4a penetrating the reinforcing plate 4 in the thickness direction and a threaded portion 4b on the inner peripheral surface of the through hole 4a are formed (corresponding to a through hole forming process). Then, the reinforcing plate 4 is attached to the steel material 2 so that the upper surface of the reinforcing plate 4 contacts the lower surface of the steel material 2 (corresponding to a plate attachment process).

[0054] 4A, the cylindrical ferrule 30 (threaded portion 30b) is screwed into the through hole 4a (threaded portion 4b) of the reinforcing plate 4, and the upper end of the cylindrical ferrule 30 is positioned at a predetermined distance (for example, the thickness of the stud piece 100) from the steel material 2. Then, the stud piece 100 is inserted into the cylindrical ferrule 30 while being held by the holding member 200, and is brought into contact with the steel material 2.

[0055] Next, as shown in Figure 4B, the stud piece 100 is stud-welded to the steel material 2 using a stud gun (not shown) or the like (corresponding to a welding process). This stud welding causes the contact area of ​​the stud piece 100 with the steel material 2 to melt (become molten metal M), which fills the gap between the stud piece 100 and the through hole 4a, etc.

[0056] In this embodiment, stud welding is performed by inserting a stud piece 100 into the through hole 4a of the reinforcing plate 4, and since the thickness of the stud piece 100 is equal to or less than the thickness of the reinforcing plate 4, it is possible to easily suppress the diffusion of sparks, odors, dust, etc. Furthermore, since a cylindrical ferrule 30 is disposed in the gap between the holding member 200 and the through hole 4a, the diffusion of sparks, odors, dust, etc. can be further suppressed.

[0057] Furthermore, by providing the notch 30c in the cylindrical ferrule 30, it is possible to release gas during stud welding. Furthermore, since the notch 30c is not continuous from the upper end to the lower end of the cylindrical ferrule 30, leakage of the molten metal M in a molten state can be suppressed.

[0058] After the stud welding (more specifically, after the molten metal M has cooled and solidified), the holding member 200 is removed from the stud piece 100 (first welding member 101) (corresponding to the holding member removing step). As a result, as shown in FIG. 4C, the first welding member 101 based on the stud piece 100 is provided without gaps on the surface (here, the lower surface) of the steel material 2 and the inner peripheral surface of the through hole 4a of the reinforcing plate 4. In other words, the steel material 2, the reinforcing plate 4, and the first welding member 101 are integrated through the molten metal M. In this way, since there is no gap (play) between the members, there is no structural loss that would occur in the past due to the presence of a gap before the reinforcing effect is exerted, and a significant structural advantage is obtained, so that the reinforcing effect can be improved. Note that FIG. 4C shows a state in which the cylindrical ferrule 30 has been removed, but if stud welding is to be performed subsequently, the cylindrical ferrule 30 does not need to be removed.

[0059] Next, as shown in Fig. 4D, the cylindrical ferrule 30 is rotated and shifted downward, and similarly to Fig. 4B, the stud piece 100 and the holding member 200 are inserted into the cylindrical ferrule 30, and the stud piece 100 is brought into contact with the first welding member 101 to perform stud welding. Then, after the stud welding, the holding member 200 is removed.

[0060] As a result, the second welding member 102 based on the stud piece 100 is formed on the layer of the first welding member 101. Even in this case, the stud piece 100 is inserted into the through hole 4a of the reinforcing plate 4 for stud welding, and the periphery of the holding member 200 is surrounded by the cylindrical ferrule 30, so that the generation of sparks, odors, dust, etc. can be suppressed. In addition, the layer of the second welding member 102 is provided integrally with the first welding member 101 and the inner circumferential surface of the through hole 4a of the reinforcing plate 4 without any gaps. Furthermore, the groove portion 4b of the through hole 4a is filled with the molten metal M, so that the integration can be further improved. This improves the reinforcing effect.

[0061] Similar operations (welding process, retaining member removal process) are then repeated to form welded member 110, in which multiple layers (three layers in this embodiment) of welded members based on stud pieces 100 are stacked together. By repeating stud welding in this manner, it is possible to complete plug welding that fills all of the gaps with through hole 4a, even if reinforcing plate 4 is a thick member.

[0062] Next, the cylindrical ferrule 30 is rotated to remove it from the through hole 4a, and as shown in Fig. 4E, the stud bolt 10 is inserted into the through hole 4a and stud welding is performed. As a result, the tip of the stud bolt 10 is joined to the welding member 110 (here, the third welding member 103). Also, molten metal M by the stud welding is filled into the gap between the stud bolt 10 and the through hole 4a. This allows the reinforcing plate 4 and the stud bolt 1 to be integrated without any gaps.

[0063] Thereafter, the washer 12 is inserted onto the stud bolt 10, and further, the nut 14 is screwed onto the stud bolt 10, and the reinforcing plate 4 is pressed against the steel material 2 via the washer 12 (see FIG. 1B). This makes it possible to further integrate the steel material 2 and the reinforcing plate 4.

[0064] As described above, the reinforcement structure of this embodiment includes a steel material 2, a reinforcing plate 4 attached to the steel material 2 and having a through hole 4a penetrating in the thickness direction, and a welded member 110 stud-welded to the steel material 2 at the through hole 4a. The welded member 110 is integrated with the inner circumferential surface of the through hole 4a via the molten metal M, and the thickness of the welded member 110 is equal to or less than the thickness of the reinforcing plate 4.

[0065] As a result, the welded member 110 is formed in the through hole 4a with a thickness equal to or less than the thickness of the reinforcing plate 4 (in other words, stud welding is performed in the through hole 4a), making it possible to suppress the diffusion of sparks, odors, dust, and the like. In addition, the steel material 2, the reinforcing plate 4, and the welded member 110 can be joined without any gaps, eliminating the structural loss that would occur in the past due to the presence of gaps before the reinforcing effect was achieved, resulting in significant structural benefits. Therefore, the impact of welding on the surroundings can be easily suppressed, and the reinforcing effect can be improved.

[0066] The welded member 110 has a first welded member 101 that is stud-welded to the steel material 2, and a second welded member 102 that is stud-welded to the first welded member 101.

[0067] As a result, by repeatedly performing stud welding a number of times, even if the reinforcing plate 4 is a thick member, plug welding can be completed to fill all of the gaps with the through hole 4a.

[0068] Further, a threaded portion 4b is formed on the inner peripheral surface of the through hole 4a, and the molten metal M is filled into the threaded portion 4b.

[0069] This allows for greater integration.

[0070] Further, a stud bolt 10 is stud-welded to a welding member 110 in the through hole 4a, and molten metal M is filled in the gap between the stud bolt 10 and the through hole 4a.

[0071] This allows the reinforcing plate 4 and the stud bolt 10 to be integrated without any gaps.

[0072] It also has a nut 14 that screws onto the stud bolt 10 and presses the reinforcing plate 4 against the steel material 2.

[0073] This allows the steel material 2 and the reinforcing plate 4 to be integrated together.

[0074] The reinforcing method of this embodiment is a method for reinforcing a steel material 2 with a reinforcing plate 4, and includes a through hole forming step of forming a through hole 4a in the reinforcing plate 4 penetrating in the thickness direction of the reinforcing plate 4, a plate material attachment step of attaching the reinforcing plate 4 with the through hole 4a formed therein to the steel material 2, a welding step of inserting the stud piece 100 into the through hole 4a while holding it with a retaining member 200 and stud welding it, and a retaining member removal step of removing the retaining member 200 after the welding step. Then, a welded member 110 is formed which is integrated with the inner circumferential surface of the through hole 4a via molten metal M and has a thickness equal to or less than that of the reinforcing plate 4.

[0075] As a result, by stud welding the stud piece 100 inside the through hole 4a, the diffusion of sparks, odors, dust, etc. can be suppressed. In addition, the steel material 2, the reinforcing plate 4, and the welded member 110 can be joined without gaps, which eliminates the structural loss that would occur in the past due to gaps before the reinforcement effect was realized, resulting in significant structural benefits. Therefore, the impact of welding on the surroundings can be easily suppressed and the reinforcing effect can be improved.

[0076] In addition, the welding process and the retaining member removal process are repeated multiple times, and the welded member 110 includes a first welded member 101 in which a stud piece 100 is stud welded to a steel material 2, and a second welded member 102 in which the stud piece 100 is stud welded to the first welded member 101.

[0077] As a result, by repeating the stud welding, even if the reinforcing plate 4 is a thick member, plug welding can be completed to fill all the gaps with the through hole 4a.

[0078] In the welding step, the cylindrical ferrule 30 is inserted into the through hole 4a, and the stud piece 100 and the holding member 200 are inserted into the cylindrical ferrule 30 to perform stud welding.

[0079] This makes it possible to further suppress the spread of sparks, odors, dust, and the like caused by stud welding.

[0080] The cylindrical ferrule 30 has a helical thread 30b on its outer peripheral surface, and the through hole 4a has a thread 4b on its inner peripheral surface that corresponds to the thread 30b. In multiple stud welding operations, the cylindrical ferrule 30 is rotated to shift (vary) the vertical position of the cylindrical ferrule 30, and the molten metal M produced by the stud welding is also filled into the thread 4b.

[0081] This allows for greater integration.

[0082] ===Other embodiments=== The above-mentioned embodiment is for facilitating understanding of the present invention, and is not intended to limit the present invention. The present invention may be modified or improved without departing from the spirit of the present invention, and it goes without saying that the present invention includes equivalents. In particular, the following embodiments are also included in the present invention.

[0083] In the above embodiment, the reinforcing plate 4 is provided below the steel material 2, but this is not limiting, and the reinforcing plate 4 may be provided above the steel material 2. In this case, the stud welding may be performed downward. The steel material 2 and the reinforcing plate 4 may be provided along the up-down direction (vertical direction). In this case, the stud welding may be performed sideways (horizontally).

[0084] In the above embodiment, the welded member 110 is formed by stacking three layers of the first welded member 101, the second welded member 102, and the third welded member 103, but this is not limited thereto and it may be a single layer (for example, only the first welded member 101) or four or more layers. By repeatedly performing stud welding, it is possible to complete plug welding that fills all of the gaps with the through hole 4a even if the reinforcing plate 4 is a thick member.

[0085] In the above-described embodiment, the washer 12 is inserted onto the stud bolt 10 and the nut 14 is screwed onto it, but the washer 12 and the nut 14 do not necessarily have to be provided. Also, the stud bolt 10 does not necessarily have to be provided. [Explanation of symbols]

[0086] 2 Steel material 4 Reinforcement plate (plate material) 4a through hole 4b Threaded part (groove) 10 Stud bolt (bar material) 10a Shaft 10b Threaded part 12 Washer 14 Nut (fastening material) 30 Cylindrical ferrule 30a Cylinder part 30b Threaded portion (protruding portion) 30c Cutout 100 Stud piece (stud welding material) 101 First welding member 102 Second welding member 103 Third welding member 110 Welding materials 200 Retaining member M Molten metal

Claims

1. Steel and A plate material attached to the steel material and having a through hole penetrating in a thickness direction; A welded member that is stud-welded to the steel material in the through hole; Equipped with the welded member is integrated with an inner circumferential surface of the through hole via molten metal, The thickness of the welded member is equal to or less than the thickness of the plate material, The welded member is A first welded member that is stud welded to the steel material; A second weld member stud-welded to the first weld member; A reinforcing structure comprising:

2. The reinforcing structure according to claim 1, A groove is formed on the inner circumferential surface of the through hole, The groove is filled with molten metal. A reinforcing structure characterized by:

3. A reinforcing structure according to claim 1 or 2, a bar material stud welded to the weld member in the through hole; A gap between the bar and the through hole is filled with molten metal. A reinforcing structure characterized by:

4. A reinforcing structure according to claim 3, A fastening member is provided which is screwed into the bar material and presses the plate material against the steel material. A reinforcing structure characterized by:

5. A reinforcing method for reinforcing a steel material with a plate material, comprising the steps of: a through hole forming step of forming a through hole in the plate material so as to penetrate the plate material in a thickness direction; a plate material attachment process of attaching the plate material having the through hole formed therein to the steel material; a welding step of inserting a stud welding member into the through hole while holding the stud welding member with a holding member; a holding member removing step of removing the holding member after the welding step; having a welded member having a thickness equal to or less than the thickness of the plate material, the welded member being integrated with an inner peripheral surface of the through hole via a molten metal; The welding step and the holding member removing step are repeatedly performed a plurality of times; The welded member includes a first welded member in which the stud welded member is stud welded to the steel material, and a second welded member in which the stud welded member is stud welded to the first welded member. A reinforcing method comprising:

6. A method for reinforcing a steel material with a plate material, comprising: a through hole forming step of forming a through hole in the plate material so as to penetrate the plate material in a thickness direction; a plate material attachment process of attaching the plate material having the through hole formed therein to the steel material; a welding step of inserting a stud welding member into the through hole while holding the stud welding member with a holding member; a holding member removing step of removing the holding member after the welding step; having a welded member having a thickness equal to or less than the thickness of the plate material, the welded member being integrated with an inner peripheral surface of the through hole via a molten metal; In the welding step, a cylindrical ferrule is inserted into the through hole, and the stud welding member and the holding member are inserted into the cylindrical ferrule to perform stud welding. A reinforcing method comprising:

7. A reinforcing method according to claim 6, comprising: the cylindrical ferrule has a helical protrusion on an outer circumferential surface, a groove portion corresponding to the protrusion portion is provided on the inner circumferential surface of the through hole, The welding step and the holding member removing step are repeatedly performed a plurality of times; In the multiple welding steps, the position of the cylindrical ferrule is changed in each step, The molten metal from the stud welding is filled into the groove. A reinforcing method comprising:

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