JP3173743U - Welding backing - Google Patents

Abstract

The present invention provides a novel welding backing metal that can be bent with a smaller radius than before and can be easily and reliably bent.
A welding backing metal 100 which is welded along the inner side of an end of a prism column, and a width from one side of a portion to be bent 20 of a backing plate body 10 having a strip shape. A plurality of slits S extending in the direction are cut in parallel. Of the plurality of slits S, the slit depths at both ends are made shallower than the slit depths of the other slits. As a result, the bending radius can be made smaller than before, and bending can be performed easily and reliably.
[Selection] Figure 1

Description

  TECHNICAL FIELD The present invention relates to a welding backing metal used when, for example, butt welding square column columns constituting a steel structure such as a building, factory, warehouse, and the like.

  Conventionally, a round steel pipe or a square steel pipe has been used for a column pillar constituting a steel structure such as a building, a factory, or a warehouse. Many of these column pillars are divided into column pillars and beam joint members for each floor, and a diaphragm is butt welded to the end of the column pillar, and a beam joint member is butt welded to the diaphragm. .

  When the diaphragm is butt-welded to the column column end in this way, a belt-like welding backing metal is installed along the inner side of the column column end, and the welding backing metal is installed from the outside of the column column. It is common to weld.

  Examples of conventional welding backing metal suitable for such applications include those disclosed in Patent Documents 1 and 2 below. That is, the backing metal disclosed in Patent Document 1 is provided with a plurality of notched grooves (slits) in the direction perpendicular to the longitudinal direction on the inner surface corresponding to the bent portion of the strip-shaped metal plate body. . Then, the metal plate body can be easily bent into a shape along the inner surface of the corner portion of the rectangular column column by bending the metal plate body at that portion so that the plurality of cutout grooves are located inside. ing.

Japanese Utility Model Publication No. 63-157497

  By the way, since the backing metal formed with a plurality of notch grooves as disclosed in Patent Document 1 is bent by a worker or a tool on site, there is a limit to the size of the bending radius. is there. For this reason, the bending radius of the outer surface of the backing metal becomes larger than the bending radius of the inner surface of the corner portion of the rectangular column column, and a gap may be generated therebetween. In addition, since the plurality of notch grooves are all the same size, for example, the bending center shifts to the left and right even if it is bent around the central portion of the bent portion. You may need to make corrections.

  Therefore, the present invention has been devised to solve these problems. The purpose of the present invention is to provide a new welding backing metal that can make the bending radius smaller and easier and more reliable. It is to provide.

  In order to solve the above-mentioned problem, a first device is a welding backing metal welded along the inner side of an end of a rectangular column pillar, and is formed in a portion to be bent of a backing plate body having a strip shape. A plurality of slits extending in the width direction from one side of the slits are cut in parallel, and the slits located at both ends of the slits are made shallower than the slits of the other slits. This is a backing metal for welding.

  According to such a configuration, when the portion to be bent of the backing metal body in which a plurality of slits are formed is bent, the stress is easily concentrated on the central portion of the portion to be bent. As a result, the bending radius of the part to be bent can be made smaller than before, and the bending process can be reliably performed at an accurate position without the bending center position greatly deviating from side to side.

  A second device is a welding backing metal according to the first device, wherein the cut depths of the slits located at both ends are 50 to 80% of the cut depths of the other slits. According to such a configuration, when the portion to be bent of the backing metal body in which a plurality of slits are formed is bent, the stress is more easily concentrated on the center portion of the portion to be bent.

  A third device is a welding backing metal according to the first device, wherein the depth of slits other than the slits located at both ends is gradually increased toward the center. According to such a configuration, when the portion to be bent of the backing metal body in which a plurality of slits are formed is bent, the stress is more easily concentrated on the center portion of the portion to be bent.

  A fourth device is a welding backing metal according to any one of the first to third devices, wherein the number of the slits is an even number of 6 to 10. According to such a configuration, when the portion to be bent of the backing metal body in which a plurality of slits are formed is bent, the stress is more easily concentrated on the center portion of the portion to be bent. .

  According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the widths of the slits of the backing metal body are substantially the same, and the distance between adjacent slits is set to be greater than the width of the slits. It is a backing metal for welding characterized by being made small. According to such a structure, since the wall which divides between slits also becomes easy to deform | transform, the bending radius of the bending planned part can be made smaller.

  According to a sixth aspect of the present invention, in the welding backing metal according to any one of the first to sixth aspects, a taper portion is formed at a corner on the back surface side where the slit of the backing metal body is formed. It is a backing metal for welding. According to such a configuration, when the rectangular column columns are butt-welded to each other, the end portions of the other rectangular column columns are guided along the tapered portion so that the rectangular column columns can be easily and reliably butted together. Can do.

  According to the welding backing metal according to the present invention, among the plurality of slits formed in the planned folding portion of the backing metal body in which the plurality of slits are formed, the depth of slits located at both ends is changed. Since the slit is formed shallower than the slit cutting depth, the bending stress applied to the portion is easily concentrated on the central portion of the planned bending portion. As a result, the bending radius of the part to be bent can be made smaller than before, and the bending process at the accurate position can be reliably performed without causing the bending center position to greatly deviate from side to side.

1 is a perspective view showing an embodiment of a welding backing metal (before bending) 100 according to the present invention. It is a perspective view which shows one Embodiment of the backing metal for welding (after bending process) 100 which concerns on this invention. It is a partial expanded side view which shows the A section in FIG. FIG. 3 is a partially enlarged plan view showing a part A in FIG. 2. It is the conceptual diagram which showed the state which provides the backing metal for welding which concerns on this invention in the butt | matching part of a square column pillar. It is a partial expanded side view which shows other embodiment of this invention.

  Next, an embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 shows one embodiment of the welding backing metal 100 according to the present invention before bending, and FIG. 2 shows one embodiment after bending. 3 is a partially enlarged side view showing the portion A in FIG. 1, and FIG. 4 is a partial enlarged side view showing the portion A in FIG. As shown in the figure, this welding backing metal 100 is provided with two planned folding portions 20, 20 along the longitudinal direction of a strip-shaped backing metal body 10, and each of these folding planned portions 20. , 20 are formed by cutting a plurality of slits S extending in the width direction from one side thereof in parallel.

  The backing metal main body 10 is formed of a steel plate having a rectangular shape in the longitudinal direction and a straight strip shape. The size varies depending on the size of the rectangular column column to be applied, and is not particularly limited. For example, when applied to a rectangular column column of 150 × 150 mm and a plate thickness of 6 mm, the plate thickness Two of 6 to 9 mm, a width of 20 to 30 mm, and a length of 200 to 300 mm are used.

  As shown in FIG. 3, eight slits S1, S2, S3, S4, S5, S6, S7, and S8 penetrating in the width direction are formed in the planned folding portions 20 and 20 of the backing metal body 10, respectively. ing. All of the eight slits S1 to S8 have substantially the same slit width w1 and the interval w2 between the adjacent slits S and S. For example, the slit width w1 is 0.9 to 1.5 mm, and the interval w2 between the slits S and S is about 0.5 to 1.2 mm.

  On the other hand, the cut depths d1 of the slits S1 and S8 located at both ends are formed shallower than the cut depths d2 of the other slits S2 to S7 as shown in the figure. Specifically, the thickness t of the backing metal body 10 is 9.0 mm and the slit depths d2 of the slits S2 to S7 are 7.4 mm, whereas the slit depths d1 of the slits S1 and S8 are: It is 5.0 mm, which is about 50 to 80% of the cut depth d2 of the slits S2 to S7. In addition, the taper part 30 is continuously formed along the longitudinal direction in the corner | angular part by the side of the back surface in which the slit S of this backing metal main body 10 was formed.

  Then, in the welding work site or the like, the thus configured backing metal main body 10 is bent by manual work, tools, or the like until the portions 20 and 20 to be bent are each 90 ° so that the slit S side is inward. However, at that time, the slit depths d1 of the slits S1 and S8 located at both ends are shallower than the slit depths d2 of the other slits S2 to S7, so that the bending stress is the portion to be bent. It becomes easy to concentrate on the central part of 20.

  As a result, as shown in FIG. 4, the inner and outer bending radii R of the bent portion 20 can be made smaller than before, and the bending process at the correct position can be ensured without causing a significant shift in the bending center position. It can be carried out. And such an effect | action and an effect can be exhibited notably by making the cutting depth d2 of slit S1 and S8 into about 50 to 80% of the cutting depth d1 of slit S2 thru | or S7. That is, when the cutting depth d1 is less than 50% of the cutting depth d2, the crushing effect of the portion becomes small and a small bending radius cannot be obtained, and conversely, the cutting depth d1 exceeds 80% of the cutting depth d2. This is because it becomes difficult for the bending stress to concentrate on the central portion of the planned bending portion 20, and the bending center tends to shift to the left and right.

  Also, if the number of slits S is an even number of 6 to 10 centering on 8 as in the present embodiment, the stress is more easily concentrated on the central portion of the planned bending portion. , More reliable bending can be performed. Here, when the number of slits S is less than 6, a smooth curved shape cannot be obtained. Conversely, when the number exceeds 10, bending stress is difficult to concentrate on the central portion of the planned bending portion 20, and the bending center is left and right. It is because it becomes easy to slip.

  Further, as in the present embodiment, the width w1 of each slit S of the backing metal body 10 is formed substantially the same, and the distance w2 between the adjacent slits S, S is smaller than the width w1 of the slit. By doing so, the wall 11 that partitions the slits S and S is also thinned, so that the bending radius R of the planned bending portion 20 can be further reduced by closely contacting the walls 11.

  Then, the backing metal body 10 is bent by 90 ° at the planned folding portions 20 and 20 to form a U-shaped welding backing metal 100, and then paired as shown in FIG. Combine with a ring. Then, this is welded so as to protrude from the end of one square column column 40 by a predetermined amount, and then the other square column column 40 is butted against this welding backing metal 100 as a guide. By welding the groove portion of the portion from the outside, the rectangular column columns 40, 40 are butt-welded.

  At this time, since the tapered portion 30 is formed at the upper end corner portion of the backing metal body 10, the end portion of the other rectangular column column 40 is tapered when the rectangular column columns 40, 40 are butt welded. By guiding along the portion 30, the angular column columns 40, 40 can be easily and reliably abutted.

  As described above, the welding backing metal 100 of the present invention is formed such that, of the plurality of slits S, the cut depths d1 of the slits S1 and S8 located at both ends are shallower than the cut depths d2 of the other slits S2 to S6. As a result, the bending stress applied to the portion is easily concentrated on the central portion of the planned bending portion 20, and the bending radius R of the planned bending portion 20 can be easily reduced as compared with the conventional case. Further, the bending process at the accurate position can be reliably performed without the bending center position being greatly displaced from side to side.

  In addition, as shown in FIG. 6, not only the slit depths d1 of the slits S1 and S8 located at both ends are formed shallower than the slit depths d2 of the other slits S2 to S6, but also the slits S1 and S1 located at both ends. The slit depths d2 of the slits S2 to S6 other than S8 may be formed so as to gradually become deeper in steps toward the center. If it does in this way, when bending the bending part 20 of the backing metal main body 10 in which the several slit S was formed, it becomes easy to concentrate the stress further on the center part of the bending part 20 more reliably. Therefore, the bending process can be performed more reliably.

DESCRIPTION OF SYMBOLS 100 Backing metal for welding 10 Backing body 11 Wall 20 Planned bending part 30 Taper part 40 Square column pillar S Slit S1, S8 Slit located in both ends S2 thru | or S6 Other slits w1 Slit width w2 Slit space d1 Slits of both ends Cutting depth d2 Cutting depth of other slits R Bending radius of the part to be bent

Claims (6)

A welding backing metal welded along the inner side of the end of the prism column.
A plurality of slits extending in the width direction from one side of the belt plate-like backing metal main body are to be bent in parallel, and the depth of slits located at both ends of the plurality of slits is determined. A welding backing metal characterized by being shallower than the depth of the other slits. In the welding backing metal according to claim 1,
The welding backing metal according to claim 1, wherein the slits located at both ends have a cut depth of 50 to 80% of the cut depth of the other slits. In the welding backing metal according to claim 1,
A welding backing metal characterized in that the cut depth of slits other than the slits located at both ends is gradually increased toward the center. In the backing metal for welding according to any one of claims 1 to 3,
A welding backing metal, wherein the number of slits is an even number of 6 to 10. The welding backing metal according to any one of claims 1 to 4,
A welding backing metal characterized in that the width of each slit of the backing metal body is substantially the same, and the distance between adjacent slits is made smaller than the slit width. In the welding backing metal according to any one of claims 1 to 5,
A backing metal for welding, wherein a taper portion is formed at a corner portion on the back surface side where the slit of the backing metal body is formed.

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