Fixture of bead-fixing member

Abstract

To provide a new structure which can mount a bead-fixing member for fixing a weld bead onto a joint part between a lower column member, for example, as a box column and an upper column member, for example, as a box column on its upper side, when the joint part is welded.SOLUTION: A fixture 12, which is a fixture 12 of a tab 14 as a bead-fixing member 10 provided on a joint part between a lower column member 1 and an upper column member 2, includes: a mounting body part 30 mounted on a box column 1 as the lower column member 1; and a trestle part 32 that extends to outside of the joint part from the mounting body part 30, and on which the tab 14 is mounted so that at least a part of the tab 14 extends to the joint part.SELECTED DRAWING: Figure 9

Description

Technical Field

[0001] The present disclosure relates to a fixing jig for a bead stopper member used in welding of a joint portion between a lower column member and an upper column member placed thereon, for example, in automatic welding.

Background Art

[0002] In the welding of steel pipe columns at a construction site, in addition to or instead of manual work by a welding skilled worker, a welding robot is utilized. However, when it is necessary to perform welding in a state where square steel pipes are stacked at the construction site and the erection pieces provided on the upper and lower steel pipes are temporarily supported by a building jig (or an insertion jig), due to the presence of the erection pieces and the building jig, there is a limit to the utilization of the welding robot, and at least a part of the welding work is performed manually.

[0003] For example, among steel columns used in the construction of high-rise buildings, there is a welded fabricated box-section column (hereinafter, "box column"). This box column is a steel pipe column, but can be manufactured with a larger diameter than a steel pipe column such as a cold-formed square steel pipe, and is more suitable for column members in super high-rise buildings and the like. The box column is manufactured by welding four thick plates and has a square or rectangular cross-section. Therefore, unlike a cold-formed square steel pipe formed by bending a steel plate rolled in a plate shape into a square column, the box column is manufactured by welding and assembling four steel plates, so the corners (corner portions) are formed at right angles.

[0004] In the welding of this box column, for example, the upper box column is placed on the lower box column, and a building jig is applied to the erection pieces of these box columns to temporarily fix the lower box column and the upper box column. Next, welding is performed on the weld between the side surfaces of the upper and lower box columns with the erection piece removed or not attached, using a welding robot or the like. Thereby, welding of two opposing welds of the upper and lower box columns is performed. After that, the erection piece is removed, and welding of the weld between the remaining side surfaces of the upper and lower box columns is performed. In this welding operation, it has been proposed to arrange the members so as to prevent the weld bead from protruding to the adjacent weld during the welding of the two opposing welds (see, for example, Patent Document 1 and Patent Document 2).

[0005] Patent Document 3 discloses a tab used when joining a lower steel box column and an upper steel box column. This tab is welded to the welding target portion surrounded by the groove surface formed at the lower end of the side surface of the upper box column, the outer surface of the backing plate provided so as to be continuous with the groove surface, and the upper end surface of the lower box column, and when joining the lower box column and the upper box column, it is installed at a predetermined position between the corner of the upper box column and the upper end surface of the lower box column, and forms the left end surface or the right end surface of the welding target portion. The aforementioned upper end surface of the lower box column is joined to the upper end of the column portion of the lower box column, and is formed by the upper surface of a top plate that is slightly larger than the column diameter of the column portion and whose outer peripheral side protrudes outward from the outer peripheral surface of the column portion. And according to the description of Patent Document 3, the aforementioned tab is fixed at a predetermined position by sandwiching the horizontal force receiving surface of the tab installed at the predetermined position and the lower surface of the top plate of the lower box column using a fixture such as a vise so as to press the tab against the upper end surface of the lower box column.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

[0007] In the method of Patent Document 3 above, the tab is placed on a top plate that protrudes outward from the column portion of the lower box column and is fixed by a fixture such as a vise. Therefore, this method cannot be applied to the welding of a box column having a configuration in which the top plate at the upper end of the lower box column does not protrude outward.

[0008] An object of the present disclosure is to provide a novel configuration that enables attachment of a bead stop member for stopping a weld bead to a joint portion in welding of, for example, a lower column member that is a box column and an upper column member that is, for example, a box column above it. [Means for Solving the Problems]

[0009] One aspect of the present disclosure is a fixing jig for a bead stop member provided at a joint portion between a lower column member and an upper column member, an attachment main body portion attached to the lower column member, a pedestal portion that extends outward from the attachment main body portion to the joint portion and to which the bead stop member is attached so that at least a part of the bead stop member extends to the joint portion and a fixing jig is provided.

[0010] According to the fixing jig having the above configuration of the above aspect, it includes an attachment main body portion attached to the lower column member and a pedestal portion that extends outward from the attachment main body portion to the joint portion and to which the bead stop member is attached so that at least a part of the bead stop member extends to the joint portion. Therefore, the attachment main body portion can be attached to the lower column member, and the bead stop member can be fixed to the joint portion between the lower column member and the upper column member via the pedestal portion extending from the attachment main body portion.

[0011] Preferably, the mounting main body portion includes a support main body portion formed to sandwich the lower column member, and a first fixing member for fixing the support main body portion to the lower column member. According to this configuration, when the lower column member is a box column, a bead stop member can be provided at each of the corner portions or corner portions at both left and right ends of one side surface thereof with a single fixing jig via the mounting main body portion.

[0012] Preferably, the first fixing member includes a first screw member and a second screw member that extend in a substantially horizontal direction of the support main body portion, and the first screw member is disposed on the opposite side of the second screw member with the lower column member interposed therebetween. According to this configuration, the support main body portion can be reliably attached to the lower column member, and the support main body portion can be easily removed from the lower column member.

[0013] Preferably, the pedestal portion includes a groove portion into which the bead stop member is fitted, and a second fixing member for fixing the bead stop member to the groove portion. According to this configuration, the bead stop member can be attached and fixed to the groove portion so as to protrude from the joint portion.

[0014] Preferably, the second fixing member includes a screw member that extends in a substantially horizontal direction in the groove portion. According to this configuration, it becomes possible to easily attach the bead stop member to the groove portion so as to protrude from the joint portion and also to remove the bead stop member. Further, according to this configuration, the position of the bead stop member in the groove portion can be easily finely adjusted, so that the bead stop member can be more suitably arranged at the joint portion.

Advantages of the Invention

[0015] According to the above aspect of the present disclosure, since the above configuration is provided, it becomes possible to more suitably attach a bead stop member to the joint portion in the welding of the joint portion between the lower column member and the upper column member thereon.

Brief Description of the Drawings

[0016]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Figure 15

Mode for Carrying Out the Invention

[0017] Hereinafter, embodiments according to the present disclosure will be described based on the attached drawings. The same parts (or components) are denoted by the same reference numerals, and their names and functions are also the same. Therefore, detailed descriptions thereof will not be repeated.

[0018] The fixing jig 12 of the bead stop member 10 according to an embodiment of the present disclosure will be described based on the drawings.

[0019] First, the joint 3 of the upper and lower box columns 1 and 2, and the tab 14 which is an example of the bead stop member 10 used at the joint 3 will be described. Note that the lower box column 1 is an example of a lower column member, and the box column 2 placed on the upper side thereof is an example of an upper column member.

[0020] Figure 1 shows an elevation view around the joint 3 formed between the box columns 1 and 2, with the steel box column 2 placed on top of the lower steel box column 1. Figure 2(a) shows the box column 2 placed on the existing box column 1, with their erection pieces 5a and 5b arranged vertically. Figure 2(b) shows the erection pieces 5a and 5b of Figure 2(a) with the erection jig 6 (for example, the commercially available erection jig "Erection Ace" (registered trademark)) attached. As shown in Figure 2(a), the erection pieces 5a and 5b are fixed at the vertical joint between the new box column 2 and the existing box column 1 in the previous section. Note that the erection pieces 5a and 5b are provided for each of the four sides of the box columns 1 and 2. Here, one set of erection pieces 5a and 5b is provided for each side, but multiple sets of erection pieces 5a and 5b may be provided for each side.

[0021] As shown in Fig. 2(b), a building method jig 6 is attached to a set of erection pieces 5a and 5b. The building method jig 6 includes an adjustment bolt 6a in the vertical direction (Z-axis direction), a fall prevention bolt 6b, an alignment adjustment bolt 6c, a fine adjustment cam 6d, and an adjustment wedge 6e, which are respectively screwed into corresponding screw holes of the jig body 6z. Further, the building method jig 6 includes a first slit 6f into which the erection piece 5a of the newly installed box column 2 is inserted and a second slit 6g into which the erection piece 5b of the existing box column 1 is inserted, which are respectively provided on the jig body 6z. Generally, after inserting the erection piece 5a of the box column 2 into the first slit 6f, the erection piece 5b of the box column 1 is inserted into the second slit 6g below the first slit 6f. In this process, the erection pieces 5a and 5b are sandwiched by the alignment adjustment bolt 6c extending in the left-right direction, and the alignment of the box column 2 with respect to the box column 1, for example, the deviation in the left-right direction can be adjusted. Also, at the lower part of the building method jig 6, the erection pieces 5a and 5b can be integrally tightened by the fall prevention bolt 6b extending upward. The adjustment bolt 6a acts on the fine adjustment cam 6d on the adjustment wedge 6e as shown in Fig. 1, and enables, for example, the adjustment of the fall of the box column 2 with respect to the box column 1 (see the arrows A1 and A2 in Fig. 1).

[0022] As shown in Fig. 1, the joint 3 of the upper and lower box columns 1 and 2 thus position - adjusted has a region (hereinafter, welding target region) W1 surrounded by the beveled surface 2f formed at the lower end of the side surface of the upper box column 2, the outer surface 2g of the backing plate provided continuously with the beveled surface 2f, and the upper end surface 1f of the lower box column 1. Welding is performed on this welding target region W1 to join the lower box column 1 and the upper box column 2.

[0023] In the welding of the welding target area W1, first, a welder manually welds a part. As a result, the upper and lower box columns 1 and 2 are temporarily fixed. Here, for the sake of explanation, in FIG. 1, from the front side surface and counterclockwise, each side surface is defined as side surfaces 1a, 2a, side surfaces 1b, 2b, side surfaces 1c, 2c, side surfaces 1d, 2d of the box columns 1 and 2. The box columns 1 and 2 have a rectangular cross-section, and the side surfaces 1a, 2a and the side surfaces 1c, 2c located on the opposite side are formed narrower in width than the other side surfaces 1b, 2b, 1d, 2d. Note that the upper end surface 1f of the lower box column 1 forms an approximately right angle with each of the side surfaces 1a, 1b, 1c, 1d of the lower box column 1, and thus does not protrude outward from those side surfaces 1a, 1b, 1c, 1d.

[0024] As described above, the box columns 1 and 2 are manufactured by welding four steel plates, and the respective corner portions (corner portions) C1 and C2 are formed at right angles. Therefore, in the present embodiment, the welding target area W1 is divided for each side surface, and welding is performed for each of the divided welding target areas (hereinafter, welding side surface areas) W2. Accordingly, the welding target area W1 is divided into four welding side surface areas W2, that is, the welding side surface area W2a between the side surfaces 1a and 2a, the welding side surface area W2b between the side surfaces 1b and 2b, the welding side surface area W2c between the side surfaces 1c and 2c, and the welding side surface area W2d between the side surfaces 1d and 2d.

[0025] For the welding of each welding side surface area W2, a welding robot 16 as shown in FIG. 3 is used. The welding robot 16 includes a traveling carriage 20 that travels on a rail 18 provided on the upper box column 2, and a welding torch 22. The welding robot 16 moves the traveling carriage 20 left and right along the rail 18 provided on the upper box column 2, and at that time, positions the tip of the welding torch 22 extending downward from the traveling carriage 20 so as to face the welding side surface area W2, for example, the groove 2f of the box column 2, and performs welding.

[0026] In the welding of this welding side region W2, a tab 14, which is an example of the bead stop member 10, is used to prevent the welding bead B from extending to the adjacent welding side region W2. The tab 14 is shown in FIG. 4. FIGS. 4(a), (b), and (c) are a perspective view, a front view, and a right side view of the tab 14, respectively. The tab 14 is configured as a flat plate member in a substantially right-angled triangle shape. The tab 14 has a substantially right-angled triangle shape in the front view (side view) of FIG. 4(b). The tab 14 has an elongated substantially pentagonal bottom surface 14b, left and right side surfaces 14sL and 14sR that are respectively connected to the bottom surface 14b at right angles and are in a substantially right-angled triangle shape, an upper surface 14u having left and right upwardly inclined surfaces 14uL and 14uR that are respectively connected to the left and right side surfaces 14sL and 14sR, a tip surface 14a located at an acute tip and connected to the bottom surface 14b, the left and right side surfaces 14sL and 14sR, and the upper surface 14u, and a rear end surface 14r located at the rear end and connected to the bottom surface 14b, the left and right side surfaces 14sL and 14sR, and the upper surface 14u and forming a right angle with the bottom surface 14b and the side surfaces 14sL and 14sR. Here, the bottom surface 14b has an area and flatness such that the tab 14 can stand on its own when the tab 14 is placed in contact with the plane on an arbitrary horizontal plane, but it is not limited thereto. The left and right side surfaces 14sL and 14sR are formed to be parallel to each other. The upper surface 14u is linearly inclined so as to approach the bottom surface 14b from the rear end surface 14r toward the tip surface 14a and has a ridge line at the center. The upwardly inclined surfaces 14uL and 14uR are connected by this ridge line. The inclination of the upper surface 14u with respect to the bottom surface 14b corresponds to the inclination of the groove opening surface 2f of the upper box column 2. The tip surface 14a has a left tip inclined surface 14aL connected to the upwardly inclined surface 14uL, the side surface 14sL, and the bottom surface 14b, and a right tip inclined surface 14aR connected to the upwardly inclined surface 14uR, the side surface 14sR, and the bottom surface 14b. The tip surface 14a has a ridge line extending at a right angle to the bottom surface 14b, and the tip inclined surfaces 14aL and 14aR are connected by this ridge line. Thus, the tab 14 is symmetric about a virtual longitudinal section passing through the ridge line of the upper surface 14u and the ridge line of the tip surface 14a. The tab 14 is designed such that the thickness of the tip surface 14a, particularly the length of the ridge line of the tip surface 14a between the bottom surface 14b and the upward and downward inclined surfaces 14uL and 14uR, corresponds to the vertical height of the outer surface 2g of the backing plate. Note that the tip surface 14a and the upper surface 14u each have a V-shaped convex shape.

[0027] The upward inclined surfaces 14uL and 14uR provided on the left and right can be selectively used according to whether the left welding side surface region W2 is welded first or the right welding side surface region W2 is welded first, both cases being directed towards the corner C of the welding target region W1 where the tab 14 is inserted (the corner located between the corner C1 of the box column 1 and the corresponding corner C2 of the box column 2 located above it). Here, the tab 14 is made of a copper alloy for the sake of peelability from the welding bead B, but it may be made of other materials, for example, ceramics. Note that since the tab 14 is provided at the corner C of the welding side surface region W2 of the welding target region W1, it can be called a corner tab.

[0028] The attachment position of this tab 14 and the formation of the welding bead B when attached will be described based on FIGS. 5 to 8.

[0029] Figs. 5(a) and 5(b) show only the vicinity of the joint 3 between the upper and lower box columns 1 and 2. Fig. 5(a) is a perspective view showing two tabs 14 attached to the joint 3 separated from the joint 3, and Fig. 5(b) is a perspective view showing the state in which the tabs 14 are arranged at the joint 3. As shown in Figs. 5(a) and 5(b), among the welding target regions W1 of the joint 3 between the box columns 1 and 2, here, so as to partition the welding side surface region W2 where welding is performed, two tabs 14 are provided at the left and right corners C of the welding side surface region W2a so as to partition the linear welding side surface region W2a (W2) between the side surface 1a of the box column 1 and the side surface 2a of the box column 2. As described above, the welding target region W1 is a region surrounded by the groove surface 2f formed at the lower ends of the side surfaces 2a, 2b, 2c, 2d of the upper box column 2, the outer surface 2g of the backing plate provided so as to be continuous with the groove surface 2f, and the upper end surface 1f of the lower box column 1. The tabs 14 are arranged such that the bottom surface 14b contacts the upper end surface 1f of the lower box column 1, the upper surface 14u contacts the groove surface 2f of the upper box column 2, and the tip surface 14a contacts the outer surface 2g of the backing plate. The tabs 14 are arranged such that the bottom surface 14b extends along the diagonal line DL of the corners C1 and C2 of the box columns 1 and 2, that is, the welding side surface region W2a (W2). In particular, here, the tabs 14 are positioned such that the side surface 14sL or the side surface 14sR facing the welding side surface region W2a is located immediately outside the diagonal line DL at both ends of the welding side surface region W2a where welding is performed. Thereby, the formation range of the welding bead B on the welding side surface region W2a can be restricted between the tabs 14. It is also possible to select to arrange the tabs 14 such that the bottom surface 14b lies on the diagonal line DL or is separated from the diagonal line DL by a predetermined distance.

[0030] As shown in FIGS. 5(a) and 5(b), in the box columns 1 and 2 positioned as shown in FIG. 1, first, the portion between the short side surfaces 1a and 2a is defined as the welding side surface region W2a. At this time, the erection pieces 5a and 5b and the building jig 6 on the side surfaces 1a and 2a are removed. Here, although not shown in FIGS. 5(a) and 5(b), the erection pieces 5a and 5b and the building jig 6 on the other side surfaces 1b, 2b, 1c, 2c, 1d, and 2d are left as they are. However, the erection pieces 5a and 5b and the building jig 6 on the other side surfaces 1b, 2b, 1c, 2c, 1d, and 2d may also be removed in the same manner as the erection pieces 5a and 5b and the building jig 6 on the short side surfaces 1a and 2a. At this time, as described above, the upper and lower box columns 1 and 2 are temporarily fixed by manual welding by a welding skilled worker. Then, as shown in FIG. 5(b), automatic welding is performed by the welding robot 16 as shown in FIG. 3 on the welding side surface region W2a where the tabs 14 are arranged at the respective corners C. It is also possible to weld the portion between the long side surfaces 1b and 2b or between the side surfaces 1d and 2d earlier than the portion between the short side surfaces 1a and 2a or between the side surfaces 1c and 2c.

[0031] Fig. 6(a) shows a perspective view of the vicinity of the tab 14 on the right side of the welded side region W2a between the side surfaces 1a and 2a in the state of Fig. 5(b), and Fig. 6(b) shows the welded portion of the welded side region W2a between the side surfaces 1a and 2a. Then, Fig. 6(c) shows a perspective view of the periphery of the location where the tab 14 at both ends of the welded side region W2a between the side surfaces 1a and 2a has been removed and where the tab 14 on the left side of the welded side region W2a was located. From Figs. 6(a) to (c), it can be understood that the welding bead B is stopped by the tab 14 and is substantially restricted within the welded side region W2a. Since the side surfaces 14sL and 14sR facing the welded side region W2a are positioned substantially outside the diagonal line DL at both ends of the welded side region W2a, the end face Bf of the welding bead B in the welded side region W2a is generally along the diagonal line DL. After welding the welded side region W2a, the end face Bf of this welding bead B may be ground or polished to be along the diagonal line DL. Similarly, for the welded side region W2c (W2) of the joint C between the other short side surfaces 1c and 2c, automatic welding is performed with the tab 14 arranged. In this way, the state where welding is performed only on the welded side regions W2a and W2c between the short side surfaces l a and 2a and between the short side surfaces 1c and 2c is shown in the schematic diagram of Fig. 7.

[0032] Thereafter, for each of the welded side regions W2b (W2) between the remaining side surfaces 1b and 2b and the welded side region W2d (W2) between the side surfaces 1d and 2d, the erection pieces 5a and 5b and the building jig 6 of those side surfaces are removed, and automatic welding is performed. In this way, as shown in Fig. 8, welding is completed over the entire circumference of the welding target region W1 of the joint 3 between the box columns 1 and 2.

[0033] Note that the welding of the welding target region W1 and the welded side region W2 is not limited to the application of manual welding and automatic welding in the above-described procedure, and automatic welding and manual welding can be executed in any order in combination.

[0034] Now, as described above, tabs 14 are provided at both ends of the welding side region W2. The mounting method thereof and the fixing jig 12 therefor will be described below. Note that the fixing jig 12 includes a mounting main body portion 30 and a gantry portion 32. In the present embodiment, the fixing jig 12 is configured to include one mounting main body portion 30 and two gantry portions 32.

[0035] FIG. 9 shows the attachment and fixing of the tab 14 using the fixing jig 12 in the welding of the welding side region W2a. FIG. 9(a) is a view corresponding to FIG. 5(a), and is a perspective view showing the periphery of the welding side region W2a between the side surfaces 1a and 2a of the box columns 1 and 2. FIG. 9(b) shows a state in which the mounting main body portion 30 of the fixing jig 12 is attached to the box column 1 among the box columns 1 and 2 in FIG. 9(a), and FIG. 9(c) shows a state in which the gantry portion 32 extending from the mounting main body portion 30 attached to the box column 1 to the outside of the joint portion 3 is attached, and the tab 14 is attached to the gantry portion 32. Note that the hatched portions H of the side surfaces 1a and 2a in FIG. 9 represent the traces of the removed ejection pieces 5a and 5b.

[0036] FIG. 10 shows the mounting main body portion 30 of the fixing jig 12. FIG. 10(a) is a plan view of the mounting main body portion 30, and FIG. 10(b) is a front view thereof. The mounting main body portion 30 has a support main body portion 34 formed to sandwich the box column 1 which is a lower column member, and a fixing member (hereinafter, a first fixing member) 36 for fixing the support main body portion 34 to the lower box column 1. The support main body portion 34 includes a flat base portion 38 arranged to extend substantially horizontally, and a support opposing portion 40 extending at a right angle from the base portion 38 below the base portion 38.

[0037] The base portion 38 has an angular U - shaped form, and includes a main base portion 38a located outside the side surface below the welding side surface region W2 to be welded, and sub - base portions 38b and 38c extending on the same side of the main base portion 38a at both outer sides in the longitudinal direction of the main base portion 38a. The support opposing portion 40 extends downward from the inner edge of the U - shaped form of the base portion 38. Here, the support opposing portion 40 includes a main opposing portion 40a extending from the main base portion 38a, a sub - opposing portion 40b extending from the sub - base portion 38b, and a sub - opposing portion 40c extending from the sub - base portion 38c. By welding a flat plate P2 forming the sub - opposing portion 40b and a flat plate P3 forming the sub - opposing portion 40c to the flat plate P1 forming the base portion 38 respectively, and welding a flat plate P4 forming the main opposing portion 40a between these flat plates P1, P2, and P3, the support main body portion 34 is formed. Note that although the flat plates P2 and P3 extend to the outside of the U - shaped portion of the base portion 38, they may be provided to extend only to the inside of the U - shaped portion of the base portion 38. In FIG. 9, as an example, the welding of the welding side surface region W2a is described. Thus, in FIGS. 9(b) and 9(c), the main base portion 38a and the main opposing portion 40a are located outside the side surface 1a of the box column 1, the main opposing portion 40a faces the side surface 1a, the sub - base portion 38b and the sub - opposing portion 40b are located outside the side surface 1b of the box column 1, the sub - opposing portion 40b faces the side surface 1b, the sub - base portion 38c and the sub - opposing portion 40c are located outside the side surface 1d of the box column 1, and the sub - opposing portion 40c faces the side surface 1d. In this way, the support main body portion 34 of the attachment main body portion 30 is provided on the box column 1.

[0038] Bolts 42 and 44, which are the first fixing members 36, are provided on each of the sub-opposing portions 40b and 40c of the support main body portion 34 of the attachment main body portion 30. In the sub-opposing portion 40b, a plurality of bolts 42, here four bolts 42, are arranged at equal intervals in the longitudinal direction thereof, and in the sub-opposing portion 40c, a plurality of bolts 44, here four bolts 44, are arranged at equal intervals in the longitudinal direction thereof. Threaded holes 40bb and 40cb are formed in each of the sub-opposing portion 40b and the sub-opposing portion 40c for arranging these bolts 42 and 44. The bolt 42 corresponds to the first threaded member among the first fixing members 36 and is provided on the sub-opposing portion 40b of the support main body portion 34 so that the support main body portion 34 extends in a substantially horizontal direction. The bolt 44 corresponds to the second threaded member among the first fixing members 36 and is provided on the sub-opposing portion 40c of the support main body portion 34 so that the support main body portion 34 extends in a substantially horizontal direction. The bolt 42 is arranged on the opposite side of the bolt 44 with the box column 1 interposed therebetween. At this time, the direction of the bolt 42 is opposite to the direction of the bolt 44.

[0039] Here, in addition to FIG. 9, refer also to FIG. 11. FIG. 11 is a cross-sectional view of a horizontal virtual plane in the welding target region W1 between the upper and lower box columns 1 and 2, showing a state in which a portion of the box column 2 above the virtual plane is removed, and showing where the tab 14 is attached using the fixing jig 12 with respect to the welding side surface region W2a (W2). As described above, FIG. 11 is a cross-sectional view showing where the tab 14 is arranged outside the diagonal line DL of the corner C of the welding side surface region W2a.

[0040] In FIGS. 9(b), 9(c) and 11, regarding the welding of the welding side region W2a, the mounting main body portion 30 is fixed to the lower box column 1. When welding the welding side region W2a, screw the bolt 42 of the sub-opposing portion 40b located outside the side surface 1b of the box column 1 toward the side surface 1b, and strongly press the tip of the bolt 42 against the side surface 1b. Screw the bolt 44 of the sub-opposing portion 40c located outside the side surface 1d of the box column 1 toward the side surface 1d, and strongly press the tip of the bolt 44 against the side surface 1d. Thereby, the support main body portion 34 is fixed to the box column 1, and thus the mounting main body portion 30 is fixed to the box column 1. The number, arrangement, etc. of the bolts 42 and 44 may be determined so as to preferably fix the mounting main body portion 30 to the box column 1. Note that the attachment of the mounting main body portion 30 to the box column 1 is not limited to being performed by the bolts 42 and 44 which are an example of mechanical fixing means, and the first fixing member 36 may be, for example, a device using magnetic force or a magnet itself.

[0041] In addition, the support main body portion 34 of the mounting main body portion 30, for example, the base portion 38, may be fixed to the box column 1 so as to provide a substantially horizontal upper surface 38u. The leveling of the base portion 38 of this support main body portion 34, that is, its upper surface 38u, may be performed using a level or other equipment, but a certain degree of inclination from the horizontal is allowed, so it may be performed only according to the experience or sense of on-site workers without using equipment, etc. Thereby, as will be described below, the tab 14 can be supported more preferably. As shown in FIG. 9(b), the mounting position of the support main body portion 34 of the mounting main body portion 30 may be determined such that the length from the upper end surface 1f of the lower box column 1 to the upper surface 38u is a predetermined length PL. The gantry portion 32 is designed to have a size corresponding to this predetermined length PL. Note that the base portion 38 and / or the main opposing portion 40a may be configured to have a recess for the remaining portions of the erection pieces 5a and 5b shown as the hatched portions H on the side surfaces 1a and 2a in FIG. 9 so as not to interfere with the attachment.

[0042] Fig. 12 shows the pedestal portion 32. Fig. 12(a) is a front view of the pedestal portion 32, Fig. 12(b) is a plan view of the pedestal portion 32, and Fig. 12(c) is a left side view of the pedestal portion 32. The pedestal portion 32 is placed and attached on the upper surface 38u of the base portion 38 of the attachment main body portion 30. The pedestal portion 32 includes a flat pedestal base portion 48, a support rod portion 50 extending perpendicularly from the pedestal base portion 48, a tab support portion 52 extending substantially parallel to the pedestal base portion 48 on the support rod portion 50, and a tab clamping portion 54 having two substantially parallel flat plate portions 54a and 54b extending perpendicularly to the tab support portion 52 on the tab support portion 52. Here, the flat plate portions 54a and 54b are each a part of the L-shaped bent members 54La and 54Lb, and these members 54La and 54Lb are joined to the tab support portion 54 by welding, but may be composed of only flat plate members. The pedestal base portion 48 and the tab support portion 52 are each a substantially pentagonal plate-shaped portion and are aligned on the axis 50a of the support rod portion 50. The flat plate portions 54a and 54b are parallel to a virtual plane 32f defined so as to pass through one corner 52a of the pentagon of the tab support portion 52 and include the axis 50a, and thus bisect the pedestal portion 32. The virtual plane 32f passes through the middle of the flat plate portions 54a and 54b. The upper end portion 54u positioned on the corner C side of the welding side surface region W2 of the flat plate portions 54a and 54b has a shape notched with substantially the same inclination as the upper surface 14u of the tab 14. A screw hole 56 extending substantially parallel to the tab support portion 52 is formed in one of the flat plate portions 54b of the tab clamping portion 54, and a bolt 58, which is a screw member as an example of the second fixing member 57, is screwed into the screw hole 56.

[0043] The flat portions 54a and 54b of the tab clamping portion 54 define a groove portion 60 into which a tab 14, which is a bead stopper member, is fitted between them. The length between the flat portions 54a and 54b of the tab clamping portion 54, that is, the width of the groove portion 60, is longer than the length between the left and right side surfaces 14sL and 14sR of the tab 14 by a predetermined length. When the bolt 58 is loosened, the tab 14 can be positioned at an arbitrary position along the flat portions 54a and 54b in the groove portion 60. The tab 14 disposed in the groove portion 60 is sandwiched between the tip end portion of the bolt 58 and the other flat portion 54a by screwing in the bolt 58 and is fixed to the groove portion 60. The pedestal portion 32 in a state where the tab 14 is fixed to the groove portion 60 is shown in FIGS. 13(a) to (c). Note that FIGS. 13(a) to (c) are diagrams showing where the tab 14 is disposed in each of the pedestal portions 32 in FIGS. 12(a) to (c). Since the upper end portions 54u of the tips of the flat portions 54a and 54b have a shape cut out with substantially the same inclination as the upper surface 14u of the tab 14, as shown in FIG. 13(c), the tip portion 14aP including the tip end surface 14a of the tab 14 protruding from the groove portion 60 fits well with the tab clamping portion 54.

[0044] The pedestal portion 32 to which the tab 14 is attached in this way is placed and fixed on the base portion 38 of the support main body portion 34 of the attachment main body portion 30 as shown in FIGS. 9(c) and 11. At this time, the bolt 58, which is the second fixing member, extends in a substantially horizontal direction in the groove portion 60. Here, the pedestal base portion 48 of the pedestal portion 32 placed on the attachment main body portion 30 is fixed to the base portion 38 by a vise 62 which is a fixture. Note that the attachment and fixing of the pedestal portion 32 to the base portion 38 is not limited to being performed by the vise 62 which is a mechanical fixture, and the fixture may be, for example, a device using magnetic force or a magnet itself.

[0045] FIG. 11, which has already been described, also shows an example of the arrangement of the tabs 14. FIG. 11 shows a case where the right tab 14 having a side surface 14sL facing the welding side surface region W2a on each outside of the diagonal line DL of both corners C of the welding side surface region W2 located between the corners C1 and C2 of the box columns 1 and 2 and the left tab 14 having a similarly facing side surface 14sR are arranged. And the position of this tab 14 is flexibly adjusted so as to be located outside the diagonal line DL of the corner C of the welding side surface region W2 located between the corners C1 and C2 of the box columns 1 and 2. In this way, by adjusting the position of the gantry portion 32 on the substantially horizontally extending base portion 38 of the support main body portion 34 of the attachment main body portion 30, the position of the tab 14 in the welding side surface region W2a (W2) can be flexibly adjusted. Further, since the groove portion 60 is defined by flat plate portions 54a and 54b arranged substantially parallel to each other, the position of the tab 14 in the groove portion 60 along the flat plate portions 54a and 54b can be freely adjusted. In this way, since the protruding amount of the tab 14 in the groove portion 60 can also be freely adjusted, the tab 14 can be suitably positioned in the welding side surface region W2a (W2).

[0046] Regarding the fixing jig 12 described above, some characteristic configurations and the effects thereof will be described below.

[0047] The fixing jig 12 is used to provide a tab 14, which is a bead stopper member, in a predetermined welding side surface region W2 of a joint portion 3 between a box column 1 as a lower column member and a box column 2 as an upper column member. The fixing jig 12 includes an attachment main body portion 30 attached to the lower box column 1 and a gantry portion 32 extending from the attachment main body portion 30 to the outside of the joint portion 3 and having the tab 14 attached thereto such that at least a part of the tab 14 extends into the joint portion 3. According to this configuration, the attachment main body portion 30 can be attached to the box column 1, and the tab 14 can be reliably fixed to a predetermined position of the joint portion 3 between the box column 1 and the box column 2 via the gantry portion 32 extending from the attachment main body portion.

[0048] The mounting main body 30 includes a support main body 34 formed to sandwich the lower box pillar 1, and a bolt 36 which is a first fixing member for fixing the support main body 34 to the box pillar 1. According to this configuration, a tab 14 can be provided with a single fixing jig 12 via the mounting main body 30 at each of the corner portions (or corner portions) C1 at the left and right ends of one side surfaces 1a, 1c of the box pillar 1, that is, the corner C of the welding side surface regions W2a, W2c.

[0049] As is clear from FIGS. 9(b) and 11, the bolts 42, 44 which are the first fixing members 36 include a bolt 42 corresponding to a first screw member extending in a substantially horizontal direction of the support main body 34, and a bolt 44 corresponding to a second screw member. The bolt 42 is disposed on the opposite side of the bolt 44 with the box pillar 1 interposed therebetween. According to this configuration, the support main body 34 can be securely attached to the box pillar 1, and the support main body 34 can be easily removed from the box pillar 1.

[0050] The gantry portion 32 includes a groove portion 60 into which the tab 14 is fitted, and a bolt 58 which is a second fixing member 57 for fixing the tab to the groove portion 60. According to this configuration, the tab 14 can be attached and fixed to the groove portion 60 so as to protrude from the joint portion 3.

[0051] One bolt 58 which is the second fixing member 57 is a screw member extending in a substantially horizontal direction in the groove portion 60. According to this configuration, it becomes possible to easily attach the tab 14 to the groove portion 60 so as to protrude from the joint portion 3, and also to remove the tab 14 therefrom. Further, according to this configuration, the position of the tab 14 in the groove portion 60 can be easily finely adjusted, so that the tab 14 can be more suitably arranged in the joint portion 3.

[0052] As described above, the embodiments and their modifications according to the present disclosure have been described, but the present disclosure is not limited thereto. Various substitutions and changes are possible without departing from the spirit and scope of the present disclosure defined by the claims of the present application.

[0053] For example, in the above-described embodiment, the fixing jig 12 includes a mounting main body portion 30 and a pedestal portion 32 that is removably attached to the mounting main body portion 30. However, the fixing jig 12 may have a configuration in which the mounting main body portion 30 and the pedestal portion 32 are integrally manufactured from the beginning. Further, the fixing jig 12 is configured to support two tabs 14 so as to enable the tabs 14 to be provided at both ends of the welding side surface region W2. However, the fixing jig of the present disclosure may be configured to support only one tab 14 and may be used to fix one tab 14 to one corner C of the welding side surface region W2. In this case, two fixing jigs may be used to fix the tabs 14 to both ends of one welding side surface region W2.

[0054] In the above-described embodiment, the tab 14 is configured to have an upper surface 14u having left and right upward inclined surfaces 14uL and 14uR. A bead stop auxiliary member may be further used so as to further expand the tab 14 upward. Here, an auxiliary tab 100, which is an example of the bead stop auxiliary member, is shown in FIG. 14. FIG. 15 shows a usage example of the auxiliary tab 100.

[0055] FIG. 14 shows the auxiliary tab 100, and FIGS. 14(a), 14(b), 14(c), 14(d), and 14(e) are a front view, a plan view, a right side view, a perspective view, and a perspective view from another angle thereof, respectively. FIG. 15 shows a usage example in which the auxiliary tab 100 is arranged on the tab 14.

[0056] Here, the auxiliary tab 100 is configured as a flat plate member in a substantially right-angled triangle shape and is smaller than the tab 14. The auxiliary tab 100 has a similar shape to the tab 14 in most parts, but also has features that the tab 14 does not have. The auxiliary tab 100 has a substantially right-angled triangle shape in the front view (side view) of Fig. 14(a). The auxiliary tab 100 has an elongated bottom surface 100b, left and right side surfaces 100sL and 100sR that are respectively connected to the bottom surface 100b at right angles and form a substantially right-angled triangle shape, an upper surface 100u connected to the left and right side surfaces 100sL and 100sR respectively, a front end surface 100a located at the acute angle tip and connected to the bottom surface 100b, left and right side surfaces 100sl and 100sR, and the upper surface 100u, and a rear end surface 100r located at the rear end and connected to the bottom surface 100b, left and right side surfaces 100sL and 100sR, and the upper surface 100u, and forms a right angle with the bottom surface 100b. The left and right side surfaces 100sL and 100sR are formed to be parallel to each other. The upper surface 100u is linearly inclined so as to approach the bottom surface 100b from the rear end surface 100r toward the front end surface 100a and has a ridge line 100uE at the center. The upward inclined surfaces 100uL and 100uR are connected by this ridge line. The front end surface 100a has a left front end inclined surface 100aL connected to the upward inclined surface 100uL, side surface 100sL, and bottom surface 100b, and a right front end inclined surface 100aR connected to the upward inclined surface 100uR, side surface 100sR, and bottom surface 100b. The front end surface 100a has a ridge line extending at a right angle to the bottom surface 100b, and the front end inclined surfaces 100aL and 100aR are connected by this ridge line. The rear end surface 100r has a left rear end inclined surface 100rL connected to the upward inclined surface 100uL, side surface 100sL, and bottom surface 100b, and a right rear end inclined surface 100rR connected to the upward inclined surface 100uR, side surface 100sR, and bottom surface 100b. The rear end surface 100r has a ridge line extending at a right angle to the bottom surface 100b, and the rear end inclined surfaces 100rL and 100rR are connected by this ridge line. In this way, the auxiliary tab 100 is symmetric about the virtual longitudinal section passing through the ridge line of the upper surface 100u, the ridge line of the front end surface 100a, and the ridge line of the rear end surface 100r. However, the front end surface 100a and the upper surface 100u each have a V-shaped convex shape, while the rear end surface 100r has a V-shaped concave shape.Also, the inclination of the ridge line on the upper surface 100u of the auxiliary tab 100 with respect to the bottom surface 100b is substantially the same as the inclination of the ridge line on the upper surface 14u of the tab 14 with respect to the bottom surface 14b, and is particularly the same here. For example, this inclination can be set to 64° - 65°, but is not limited thereto.

[0057] The auxiliary tab 100 has the same width dimension as the tab 14. And the V-shaped concave shape of the rear end surface 100r has a corresponding relationship with the shape of the upper surface 14u of the V-shaped convex shape of the tab 14. Therefore, the auxiliary tab 100 is stably supported on the tab 14 with the rear end surface 100r of the auxiliary tab 100 substantially in close contact with the upper surface 14u of the tab 14, and can slide in the longitudinal direction of the tab 14 on the upper surface 14u.

[0058] When the tab 14 is provided at the corner C of the welding side surface region W2 of the welding target region W1 as shown in FIG. 11, the auxiliary tab 100 is disposed on the tab 14. Since the upper surface 14u of the tab 14 is inclined so as to approach the bottom surface 14b side toward the tip end surface 14a, the auxiliary tab 100 is disposed so as to contact the box column 2 according to the inclination. Thus, since the tab 14 and the auxiliary tab 100 have the above relationship with respect to their shapes, the ridge line 100uE on the upper surface 100u of the auxiliary tab 100 extends substantially in the vertical direction and can substantially contact the box column 2. Thereby, the outflow of the welding bead B from the welding target region W1 of the box columns 1 and 2 can be more reliably stopped. Note that the auxiliary tab 100 may be used simply by placing the auxiliary tab 100 on the tab 14, or the auxiliary tab 100 may be fixed on the tab 14 using fixing means such as an aluminum foil adhesive tape.

Explanation of Reference Numerals

[0059] 1, 2 Box columns 3 Joint 5a, 5b Electrode piece 6 Building jig 10 Bead stopper member 12 Fixing jig 14 Tab (corner tab) 30 Mounting main body portion 32 pedestal part 34 support body part 36 first fixing member 42, 44 bolts 57 second fixing member 58 bolt 60 groove part 100 auxiliary tab

Claims

1. A fixing jig for a bead stopper member provided at a joint between a lower column member and an upper column member, comprising a mounting body portion attached to the lower column member, and a pedestal portion extending from the mounting body portion to the outside of the joint and having the bead stopper member attached thereto such that at least a part of the bead stopper member extends into the joint. Fixing jig.

2. The mounting body portion comprises a support body portion formed to sandwich the lower column member, and a first fixing member for fixing the support body portion to the lower column member. The fixing jig according to Claim 1.

3. The first fixing member comprises a first screw member and a second screw member that extend in a substantially horizontal direction from the support body portion, and the first screw member is disposed on the opposite side of the second screw member with the lower column member therebetween. The fixing jig according to Claim 2.

4. The pedestal portion comprises a groove portion into which the bead stopper member is fitted, and a second fixing member for fixing the bead stopper member in the groove portion. The fixing jig according to Claim 1.

5. The second fixing member comprises a screw member that extends in a substantially horizontal direction in the groove portion. The fixing jig according to Claim 4. ​ ​ ​

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