Welding method for construction and building

Abstract

To join steel materials for construction in such a manner as to reduce occurrence of spark.SOLUTION: There are provided a welding method for construction which join steel materials for construction by stud welding; and a welding method for construction which repairs or reinforces a joint part between steel materials for construction by stud welding. In this case, at least one of the steel materials for construction may be a gusset plate.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to construction welding methods and constructions. [Background technology]

[0002] A technique for bolting a gusset plate to the web of a beam is known. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2023-184394 Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, not only for the gusset plates mentioned above, but also for joining steel materials for construction, bolt joints and fillet welding are often used. However, fillet welding generates sparks and has many restrictions on working conditions.

[0005] Therefore, an object of the present disclosure is to realize joining of construction steel materials in a manner that reduces the generation of sparks. [Means for solving the problem]

[0006] In one aspect, there is provided a construction welding method for joining construction steel members together by stud welding. [Effects of the Invention]

[0007] According to the present disclosure, it is possible to join construction steel materials together in a manner that reduces the generation of sparks. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a diagram showing an example of a location where the construction welding method of the present embodiment is applied. FIG. [Figure 2] FIG. 2 is an explanatory diagram showing an example of a stud and a ferrule suitable for the stud welding of the present embodiment. [Figure 3] FIG. 10 is a perspective view partially illustrating a corner between a gusset plate and a flange surface of a beam. [Figure 4] FIG. 10 is a cross-sectional view partially illustrating a corner between a gusset plate and a flange surface of a beam. [Figure 5] FIG. 1 is an explanatory diagram schematically illustrating an application example of the present embodiment. [Figure 6] FIG. 10 is an explanatory diagram schematically illustrating another application example. DETAILED DESCRIPTION OF THE INVENTION

[0009] Each embodiment will be described in detail below with reference to the accompanying drawings. Note that the dimensional ratios in the drawings are merely examples and are not limiting. Furthermore, shapes and the like in the drawings may be partially exaggerated for the sake of explanation. Furthermore, in the drawings, for ease of viewing, reference symbols may be assigned only to some of the parts that exist with the same attribute.

[0010] Fig. 1 is a diagram showing an example of a location where the construction welding method of this embodiment is applied. Fig. 1 shows three coordinate axes, X, Y, and Z, in a right-handed coordinate system. The three directions, X, Y, and Z, will be used appropriately to indicate directions in the following description.

[0011] In the following, the construction welding method of this embodiment will be described in relation to the gusset plate 10, but any construction steel material can be welded.

[0012] The construction welding method of this embodiment is suitable for use in joining a gusset plate 10 to a column 2 or a beam 3 in a construction 1, as shown in Fig. 1. The column 2 or the beam 3 is, for example, an I-beam, but may be other types of steel material. In this case, the corner between the gusset plate 10 and the flange surface 32 or 32 of the column 2 or the beam 3 is welded. In the example shown in Fig. 1, a brace 20 is fixed to the gusset plate 10 with a high-strength bolt 30. The brace 20 for seismic reinforcement may be newly installed, or may be installed later for seismic reinforcement.

[0013] Generally, fillet welding is used for welding this type of corner. However, fillet welding generates sparks and has many restrictions on working conditions. For example, fillet welding is not suitable for indoor work.

[0014] Therefore, in this embodiment, stud welding is used instead of fillet welding.

[0015] Stud welding, as it is commonly known in the construction industry, is used to install "studs" on the beams of steel-framed buildings to connect the steel beams to the concrete floor.

[0016] In this embodiment, instead of such a conventional method of use, joining of construction steel materials is realized by stud welding, that is, it is used for joining between the gusset plate 10 and the flange surface 22 or 32 of the column 2 or beam 3.

[0017] FIG. 2 is an explanatory diagram showing an example of a stud 40 and a ferrule 42 suitable for the stud welding of this embodiment.

[0018] In this embodiment, the stud 40 only forms the welded portion 70, and therefore does not need to have a processed portion such as a thread. Furthermore, the stud 40 only functions as a portion that joins two base materials, so it may be relatively short. However, an existing stud may be used as the stud 40. The ferrule 42 has a function of suppressing the intrusion of impurities and gas into the welded portion 70. An existing ferrule may be used as the ferrule 42. Alternatively, the ferrule 42 may have a truncated portion 421 that fits along a corner (for example, the corner between the gusset plate 10 and the flange surface 32 of the beam 3).

[0019] Figures 3 and 4 are explanatory diagrams that schematically show the state when stud welding is performed on the corner between the gusset plate 10 and the flange surface 32 of the beam 3. Figure 3 is a perspective view that partially shows the corner between the gusset plate 10 and the flange surface 32 of the beam 3, and Figure 4 is a cross-sectional view (corresponding to the cross-sectional view along line AA in Figure 1) that shows the same corner.

[0020] In this embodiment, stud welding is performed by attaching the stud 40 to a dedicated gun (not shown) and pressing the tip of the stud 40 against the welding target (in this example, the corner between the gusset plate 10 and the flange surface 32 of the beam 3). In this case, the metal material forming the corner between the gusset plate 10 and the flange surface 32 of the beam 3 serves as the base material, and a weld 70 is formed. That is, a portion of the gusset plate 10 and a portion of the beam 3 forming the corner serve as the base material, and are joined to the stud 40, thereby realizing a three-way joining. As a result, the gusset plate 10 and the beam 3 are joined. Note that during stud welding, the portion of the gusset plate 10 and the portion of the beam 3 forming the corner may melt, thereby directly joining the two. In this case, the joining strength can be increased.

[0021] Although the example described here is directed to a corner on the negative side in the Y direction among corners between the gusset plate 10 and the flange surface 32 of the beam 3, a welding point may also be set for a corner on the positive side in the Y direction. In this case, the welding point for the corner on the negative side in the Y direction and the welding point for the corner on the positive side in the Y direction may be set at the same position in the X direction, or may be set at positions shifted in the X direction.

[0022] Also, here, the area to be welded is the corner between the gusset plate 10 and the flange surface 32 of the beam 3, but the same applies to the corner between the gusset plate 10 and the flange surface 22 of the column 2 (the same applies to the following explanation).

[0023] According to this embodiment, by partially generating an arc with a high voltage, the gusset plate 10 and the beam 3 can be easily joined to the stud 40 (as a result, the gusset plate 10 and the beam 3 can be joined).

[0024] Stud welding is also advantageous in that it requires a relatively small machine, and has a proven track record, making it possible to form a highly reliable welded joint 70.

[0025] Furthermore, the weld 70 formed by stud welding has a larger joining range than a typical fillet weld. Therefore, the joining strength per unit length is higher, allowing the length to be shortened. For example, it is no longer necessary to form the weld 70 along the entire length L (FIG. 1) of the corner between the gusset plate 10 and the flange surface 22 of the column 2. In other words, stud welding may be performed at a predetermined pitch with non-welded areas formed in between. In this way, stud welding can be performed at the required pitch in the required locations, offering the advantages of high flexibility in construction and high efficiency.

[0026] Furthermore, stud welding generates few sparks (virtually none), and can be used indoors. Therefore, it is suitable not only for the construction of new buildings, but also for the reinforcement and repair of existing buildings, such as for seismic reinforcement. For example, reinforcement by stud welding according to this embodiment can be realized for defective joints.

[0027] Although each embodiment has been described in detail above, it is not limited to the specific embodiment, and various modifications and changes are possible within the scope of the claims. It is also possible to combine all or a plurality of components of the above-described embodiments.

[0028] For example, although the above-described embodiment is an example of application to a corner between the gusset plate 10 and the flange surface 32 of the beam 3 (or the gusset plate 10 and the flange surface 22 of the column 2), other applications are also possible. That is, in the above-described embodiment, as shown schematically in FIG. 5, a weld 70 is formed at the corner of two construction steel materials 55, 56 that are joined at a right angle, but the orientation and joining method of the two construction steel materials are arbitrary. For example, as shown schematically in FIG. 6, the present invention can also be applied to the butt joint between construction steel materials 50, 51. In FIG. 5, reference numeral 44 schematically indicates a weld. [Explanation of symbols]

[0029] 1 Construction 2 Pillar (example of construction steel material) 3 Beam (an example of construction steel) 10 Gusset plate (an example of construction steel) 20 braces 22 Flange surface 30 High-strength bolts 32 Flange surface 40 studs 42 Ferrule 50 Construction steel 51 Construction steel 55 Construction steel 56 Construction steel 44, 70 Welded section (an example of a stud welded section) 421 Truncated head

Claims

1. A construction welding method that uses stud welding to join construction steel materials together.

2. A construction welding method that uses stud welding to repair or reinforce joints between construction steel materials.

3. The construction welding method according to claim 1 or 2, wherein at least one of the construction steel materials is a gusset plate.

4. Construction in which the joints between structural steel members include stud welds.

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