Column-beam joint structure

Abstract

To prevent the occurrence of inconvenience in which a gap between a diaphragm of a steel column and a backing metal on the side of an H-shaped beam exceeds an allowable range while eliminating the need for upward welding of high difficulty at an erection site.SOLUTION: In a manufacturing process of an H-beam 2, a pre-attached backing metal 23 inserted into a notch groove 22B formed at a web upper end of a beam-end part 2A and welded and joined to a lower surface side of an upper flange 20 has a flange-width-direction length L1 set to be longer than the thickness t1 at an upper end of a web 22 including a remaining part 22Da of a fillet 22D that remains on both sides of the web 22 after forming the notch groove but shorter than the flange-width of the upper flange 20, and in an erection process, a pair of post-attached backing metal 24 for column-beam welding, which is positioned and temporarily welded to both ends in the flange-width-direction on the lower surface side of the upper flange 20 in alignment with the flange-width-direction, is set to have the flange-width-direction length L2 is set to a length from the flange-width-direction end of the pre-attached backing metal 23 to the flange-width-direction end of the upper flange 20.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a column-beam connection structure in which the end of an H-shaped beam, which has a scallop that enables on-site welding to a steel column having upper and lower diaphragms, is welded to the steel column at the construction site. [Background technology]

[0002] Conventionally, when welding the beam end of an H-beam to a steel column at the construction site, it is common practice to form scallops at both the top and bottom ends of the web of the H-beam during the manufacturing process of the H-beam, which is carried out in a factory, to enable welding at the construction site. If scallops are formed in this way, there is a possibility that the locations where the scallops are formed in the H-beam may become the starting points of damage in the event of a major earthquake, and in order to eliminate this possibility, it is effective to perform filling welding to close the top and bottom scallops after welding the beam end of the H-beam to the steel column on site.

[0003] However, when performing such filling welding, it is necessary to perform overhead welding on the upper scallop, which is highly difficult and it is extremely difficult to secure a qualified person. Even if it is possible to secure a qualified person, there is a high possibility that a welding defect will occur in the filling welding area, which is the most important part, and if a welding defect occurs, it is difficult to repair it, so there is room for improvement. In other words, it is desirable to eliminate the need for fill welding on the upper scallop, which requires difficult upward welding.

[0004] Therefore, as a welding method for column-beam joints that does not require the above-mentioned filling welds, for example, when joining the upper and lower flanges and web of an H-shaped beam (H-shaped steel) to a column material such as a square column to form a column-beam joint, there is a method that includes a process of cutting notched grooves corresponding to the cross-sectional dimensions of the backing metal into both the upper and lower ends of the web of the H-shaped beam, attaching a series of backing metals corresponding to the flange width to the inside of each flange within these notched grooves, and welding these backing metals and the web all around to close each notched groove (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 08-001331 Summary of the Invention [Problem to be solved by the invention]

[0006] However, in the welding method described in Patent Document 1, before the H-beam is welded on-site to the steel column, a series of backing metals corresponding to the flange width of the H-beam are welded all around to the web of the H-beam. Therefore, during the construction process, due to construction errors in the inclination of the steel column that was erected earlier or the umbrella breakage of the diaphragm, the gap between the diaphragm of the steel column and the backing metal on the H-beam side may become larger the further away from the web of the H-beam, exceeding the allowable range. If the allowable range is exceeded, repairs will require a considerable amount of effort.

[0007] In light of this situation, the main objective of the present invention is to prevent the occurrence of the inconvenience of the gap between the diaphragm of the steel column and the backing metal on the H-shaped beam exceeding the acceptable range, while eliminating the need for difficult upward welding at the construction site. [Means for solving the problem]

[0008] The first characteristic configuration of the present invention is as follows: The upper diaphragm and the lower diaphragm The steel column has a scallop that allows for on-site welding to the steel column. At the bottom of the web This is a column-beam joint structure in which the beam ends of the formed H-shaped beams are welded at the construction site, In the manufacturing process of the H-beam, The above A pre-attached backing plate for column-beam welding is inserted into a notch groove formed at the upper end of the web and welded to the lower surface side of the upper flange at the beam end; In the erection process of welding the beam end to the steel column, a pair of post-attached backing metals for column-beam welding are aligned and temporarily welded to both ends in the flange width direction on the underside of the upper flange, the pre-attached backing metal has a length in the flange width direction that is longer than a thickness at an upper end of the web including a remaining portion of a fillet that remains on both sides of the web after the notch groove is formed, and is set to a length shorter than a flange width of the upper flange; The length of the post-attached backing plate in the flange width direction is set to a length extending from an end of the pre-attached backing plate in the flange width direction to an end of the upper flange in the flange width direction. 、 the pre-attached backing metal has a step corresponding to a difference between a thickness of the upper diaphragm and a thickness of the upper flange, and a protruding length from the upper flange is set to be longer than a root gap between the upper diaphragm and the upper flange, The post-attached backing metal has a cross-sectional shape, as viewed in the flange width direction, of a horizontally long rectangle without any step, and its horizontal length is set to be longer than the root gap. It's at the point.

[0009] According to this configuration, the pre-attached backing metal is inserted into the notch groove of the beam end and welded to the underside of the upper flange at the beam end during the manufacturing process of the H-beam, so the H-beam can be turned upside down when the pre-attached backing metal is welded to the beam end. This makes it possible to easily weld the pre-attached backing metal to the underside of the upper flange at the beam end by downward welding, which is expected to produce stable quality. Therefore, during the construction process of welding the end of an H-beam to a steel column, it is no longer necessary to perform upward welding, which is difficult and for which very few people are qualified, but which was previously required when welding a pre-attached backing plate to the end of the H-beam. Moreover, the pre-attached backing metal and the post-attached backing metal have a flange width direction length that corresponds to the flange width of the upper flange as a whole, but the length of the pre-attached backing metal in the flange width direction is shorter than the flange width of the upper flange, so that even if there is a construction error in the inclination of the steel column that was previously erected during the erection process or the upper diaphragm is bent, the gap between the upper diaphragm of the steel column and the pre-attached backing metal on the H-beam side can be prevented from exceeding the allowable range. Furthermore, the gap between the upper diaphragm and the post-attached backing metal can be easily adjusted to within the allowable range when the post-attached backing metal is temporarily welded to the underside of the upper flange. In addition, since the length of the pre-attached backing plate in the flange width direction is longer than the thickness at the upper end of the web including the remaining portion of the fillet, it becomes easier to weld the pre-attached backing plate to the upper end of the web at the beam end by downward welding with the H-shaped beam turned upside down. As a result, it is possible to eliminate the need for difficult upward welding while preventing the occurrence of problems such as gaps between the upper diaphragm of the steel column and each backing metal on the H-shaped beam exceeding the allowable range.

[0011] Furthermore, According to this configuration, in the erection process, the pre-attached backing metal can be attached to the upper diaphragm of the steel column while absorbing the difference between the thickness of the upper diaphragm and the thickness of the upper flange, and the upper diaphragm can be placed in a state where the upper diaphragm and the lower surface of the upper diaphragm overlap each other. Also, the post-attached backing metal can be attached to the upper diaphragm with the column side end surface abutted against the beam side end surface of the upper diaphragm, while the post-attached backing metal and the lower surface of the upper flange overlap each other. As a result, even though the root gap between the upper diaphragm and the upper flange differs depending on the thickness and groove shape of the upper diaphragm and upper flange, the variation in the root gap can be easily absorbed by using specified pre-attached backing metals and post-attached backing metals that have the same length in the root gap direction.

[0012] The present invention Second The characteristic configuration is: A column-beam joint structure in which a steel column having an upper diaphragm and a lower diaphragm is welded to the end of an H-shaped beam having a scallop formed at the lower end of the web to enable on-site welding to the steel column, In the manufacturing process of the H-shaped beam, a pre-attached backing plate for column-beam welding is inserted into a notch groove formed at the upper end of the web at the beam end and welded to the lower surface side of the upper flange at the beam end; In the erection process of welding the beam end to the steel column, a pair of post-attached backing metals for column-beam welding are aligned and temporarily welded to both ends in the flange width direction on the underside of the upper flange, the pre-attached backing metal has a length in the flange width direction that is longer than a thickness at an upper end of the web including a remaining portion of a fillet that remains on both sides of the web after the notch groove is formed, and is set to a length shorter than a flange width of the upper flange; the post-attached backing metal has a length in the flange width direction set to a length extending from an end of the pre-attached backing metal in the flange width direction to an end of the upper flange in the flange width direction, The pre-attached backing metal is divided into a thick plate portion corresponding to the distance between the underside of the upper flange and the upper end of the web in the cutout groove, and a thin plate portion corresponding to the distance between the underside of the upper diaphragm and the upper end of the web during the construction process.

[0013] According to this configuration, the pre-attached backing metal is inserted into the notch groove of the beam end and welded to the underside of the upper flange at the beam end during the manufacturing process of the H-beam, so the H-beam can be turned upside down when the pre-attached backing metal is welded to the beam end. This makes it possible to easily weld the pre-attached backing metal to the underside of the upper flange at the beam end by downward welding, which is expected to produce stable quality. Therefore, during the construction process of welding the end of an H-beam to a steel column, it is no longer necessary to perform upward welding, which is difficult and for which very few people are qualified to do so, as was previously required when welding a pre-attached backing plate to the end of the H-beam. Moreover, the pre-attached backing metal and the post-attached backing metal have a flange width direction length that corresponds to the flange width of the upper flange as a whole, but the length of the pre-attached backing metal in the flange width direction is shorter than the flange width of the upper flange, so that even if there is a construction error in the inclination of the steel column that was previously erected during the erection process or the upper diaphragm is bent, the gap between the upper diaphragm of the steel column and the pre-attached backing metal on the H-beam side can be prevented from exceeding the allowable range. Furthermore, the gap between the upper diaphragm and the post-attached backing metal can be easily adjusted to within the allowable range when the post-attached backing metal is temporarily welded to the underside of the upper flange. In addition, since the length of the pre-attached backing plate in the flange width direction is longer than the thickness at the upper end of the web including the remaining portion of the fillet, it becomes easier to weld the pre-attached backing plate to the upper end of the web at the beam end by downward welding with the H-shaped beam turned upside down. As a result, it is possible to eliminate the need for difficult upward welding while preventing the occurrence of problems such as gaps between the upper diaphragm of the steel column and each backing metal on the H-shaped beam exceeding the allowable range. Furthermore, According to this configuration, if there are multiple column-beam joints where the difference between the thickness of the upper diaphragm and the thickness of the upper flange is different, this can be easily accommodated by changing the combination of the thick plate portions and the thin plate portions according to these differences.

[0014] The present invention Third The characteristic configuration is: The steel column is provided with a height adjustment mechanism that enables adjustment of the height position of the upper surface of the pre-attached backing plate relative to the lower surface of the upper diaphragm during the construction process.

[0015] According to this configuration, the height adjustment mechanism allows the height position of the upper flange relative to the upper diaphragm to be easily and precisely adjusted, thereby avoiding the risk of misalignment between the upper diaphragm and the upper flange falling outside the specified range. [Brief description of the drawings]

[0016] [Figure 1]Vertical cross-sectional view of the main part showing the configuration of the column-beam joint structure [Diagram 2] Enlarged vertical cross-sectional view of the main part showing the configuration of the column-beam joint structure [Diagram 3] Horizontal cross-sectional view looking up at the main part showing the structure of the column-beam joint structure [Figure 4] A front view of the end of an H-beam showing the relative positions of the pre-attached backing plate and the post-attached backing plate at the end of the beam. [Diagram 5] FIG. 13 is a vertical cross-sectional view of a main portion showing the configuration of a column-beam joint structure in another embodiment. [Figure 6] FIG. 13 is an enlarged vertical cross-sectional view of a main portion showing the configuration of a column-beam joint structure in another embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings.

[0018] Figure 1 shows an example of a column-beam connection structure in which a steel column 1, primarily made of a square steel pipe, is erected at the construction site and the beam end 2A of an H-shaped beam 2, primarily made of H-shaped steel, is welded at the construction site.

[0019] As shown in Figs. 1 and 2, upper and lower diaphragms 10, 11 are welded to the joints of the steel column 1 and the beam end 2A of the H-shaped beam 2 using backing metal 12. A gusset plate 13 for beam connection is welded between the upper diaphragm 10 and the lower diaphragm 11 on the outer circumferential surface of the steel column 1. The upper and lower diaphragms 10, 11 are through diaphragms, and the upper and lower diaphragms 10, 11 and the gusset plate 13 are welded to the steel column 1 during the manufacturing process of the steel column 1 at a factory or the like.

[0020] As shown in Fig. 1, the gusset plate 13 is formed with a plurality of loose holes 13A that enable bolt connection to the beam end portion 2A of the H-shaped beam 2. Each loose hole 13A is formed vertically long so as to enable adjustment of the height of the H-shaped beam 2 relative to the steel column 1. Each loose hole 13A may be an enlarged hole formed with a large diameter as long as it enables adjustment of the height of the H-shaped beam 2 relative to the steel column 1.

[0021] As shown in Figures 1 and 3, a pair of support plates 14 that support the beam end 2A of the H-beam 2 from below are welded to a position below the lower diaphragm 11 on the outer circumferential surface of the steel column 1. The pair of support plates 14 are welded to the outer circumferential surface of the steel column 1 at an arrangement spaced a predetermined distance apart in the flange width direction of the H-beam 2 that they support, during the manufacturing process of the steel column 1 at a factory or the like.

[0022] As shown in Figs. 1 and 2, the H-shaped beam 2 has an upwardly open groove 20A, 21A at the joint ends of the upper and lower flanges 20, 21 with the diaphragms 10, 11, which allows for butt welding with the upper and lower diaphragms 10, 11. As shown in Fig. 1, a plurality of round holes 22A are formed on the beam end side of the web 22, which allows for bolt connection with the gusset plate 13. As shown in Figs. 1 to 4, a notch groove 22B for attaching a backing metal is formed on the upper end of the beam end side of the web 22. As shown in Fig. 1, a scallop 22C is formed on the lower end of the beam end side of the web 22, which allows for a series of butt welding between the lower diaphragm 11 and the lower flange 21 across the flange width of the lower flange 21. The upper and lower grooves 20A, 21A, the plurality of round holes 22A, the notch groove 22B, and the scallop 22C are formed on the H-shaped beam 2 during the manufacturing process of the H-shaped beam 2 in a factory or the like.

[0023] As shown in Figures 1 to 4, the upper part of the beam end 2A of the H-shaped beam 2 is provided with a pre-attached backing metal 23 for column-beam welding, which is inserted into the notched groove 22B described above and welded to the lower surface side of the upper flange 20 at the beam end 2A in the manufacturing process of the H-shaped beam 2, and a pair of post-attached backing metals 24 for column-beam welding, which are aligned to both ends in the flange width direction on the lower surface side of the upper flange 20 and temporarily welded in the erection process of welding the beam end 2A of the H-shaped beam 2 to the steel column 1. As shown in Figure 1, the lower end of the beam end 2A of the H-shaped beam 2 is provided with a backing metal 25 for column-beam welding, which is aligned to the lower surface side of the lower flange 21 in a continuous state over the flange width and then temporarily welded in the erection process.

[0024] As shown in Figs. 3 and 4, the pre-attached backing metal 23 has a flange width direction length L1 that is longer than a thickness t1 (see Fig. 4) at the upper end of the web 22 including the remaining portion 22Da of the fillet 22D that remains on both sides of the web 22 after the formation of the notched groove 22B described above, and is shorter than the flange width W (see Fig. 3) of the upper flange 20. The flange width direction length L2 of each post-attached backing metal 24 is set to a length that extends from both ends of the pre-attached backing metal 23 in the flange width direction to the ends of the upper flange 20 in the flange width direction. In this embodiment, the flange width direction length L2 of each post-attached backing metal 24, which is the length that extends from both ends of the pre-attached backing metal 23 in the flange width direction to the ends of the upper flange 20 in the flange width direction, is illustrated as a length that exceeds the ends of the upper flange 20 in the flange width direction as shown in Fig. 4, but is not limited thereto, and may be a length that does not exceed the ends of the upper flange 20 in the flange width direction.

[0025] 2, the pre-attached backing metal 23 has a step d1 corresponding to the difference between the thickness t2 of the upper diaphragm 10 and the thickness t3 of the upper flange 20, and the overhang length L3 from the upper flange is set longer than the root gap g between the upper diaphragm 10 and the upper flange 20. The post-attached backing metal 24 has a cross-sectional shape, as viewed in the flange width direction, that is horizontally long and has no step, and its horizontal length L4 is set longer than the above-mentioned root gap g.

[0026] 1 to 4, pre-attached backing metal 23 has a thick plate portion 23A corresponding to the distance d2 (see FIG. 2) between the lower surface of upper flange 20 and the upper end of web 22 in notch groove 22B, and a thin plate portion 23B corresponding to the distance d3 (see FIG. 2) between the lower surface of upper diaphragm 10 and the upper end of web 22 in the erection process. As shown in FIGS. 1 to 2, pre-attached backing metal 23 is formed so that the above-mentioned step d1 is located on an extension line of the groove surface that forms groove portion 20A of upper flange 20, and the location where step d1 is formed is inclined at the same angle as the groove angle of groove portion 20A of upper flange 20.

[0027] As shown in Fig. 1, the steel column 1 is provided with a height adjustment mechanism 3 that enables adjustment of the height position of the upper surface of the pre-attached backing metal 23 relative to the lower surface of the upper diaphragm 10 during the erection process. The height adjustment mechanism 3 is composed of a pair of splitting arrows 30 that are driven between each support plate 14 on the steel column 1 side and the lower flange 21 of the H-shaped beam 2. A recess 14A is formed at the upper end of each support plate 14, which enables the splitting arrow 30 to be driven between the lower flange 21 of the H-shaped beam 2.

[0028] In the construction method using the beam-column joint structure exemplified in this embodiment, first, in the manufacturing process of the H-beam 2 in a factory or the like, the upper and lower grooves 20A, 21A, the notch groove 22B, the scallops 22C, etc. are formed in the beam end 2A of the H-beam 2. In addition, the pre-attached backing metal 23 is inserted into the notch groove 22B and welded to the lower surface side of the upper flange 20 at the beam end 2A. In the construction process at the construction site, the H-shaped beam 2 is lifted by a crane or the like with respect to the steel column 1 that has been erected at the construction site in advance, and the beam end 2A of the H-shaped beam 2 is placed on the upper end of each support plate 14 of the steel column 1 in a state in which the web 22 is in surface contact with the gusset plate 13 on the steel column 1 side to prevent positional deviation in the flange width direction, and in a state in which the thin plate portion 23B of the pre-attached backing metal 23 is inserted under the upper diaphragm 10 to ensure a root gap g (see FIG. 2) between the upper and lower diaphragms 10, 11 and the upper and lower flanges 20, 21. After this placement, the web 22 of the beam end 2A and the gusset plate 13 on the steel column 1 side are temporarily fixed using construction bolts in a state in which the height adjustment of the H-shaped beam 2 with respect to the steel column 1 is allowed. Once this temporary fastening is completed, a pair of splitters 30 are driven between each support plate 14 on the steel column 1 side and the lower flange 21 of the H-shaped beam 2 so that the height position of the upper flange 20 relative to the upper diaphragm 10 falls within the specified range, and a height adjustment is performed to gradually increase the height position of the H-shaped beam 2 relative to the steel column 1. Then, when the height position of the upper flange 20 relative to the upper diaphragm 10 falls within a specified range by this height adjustment, the gusset plate 13 on the steel column 1 side and the web 22 of the beam end 2A are finally fastened together using the high-strength bolt 4 (see FIG. 1). After this final fastening, each post-attached backing metal 24 is tack welded to the lower side of the upper flange 20 with its column side end face 24B abutting against the beam side end face 10A of the upper diaphragm 10 (see FIGS. 1-2), and the backing metal 25 is tack welded to the lower side of the lower flange 21 with its column side end face 25A abutting against the beam side end face 11A of the lower diaphragm 11 (see FIG. 1). After these tack welds, the steel column 1 and the beam end 2A of the H-shaped beam 2 are welded together, and the above-mentioned scallop 22C is filled with welds. In other words, by performing the above-mentioned construction method using the column-beam joint structure exemplified in this embodiment, the H-shaped beam 2 can be properly welded to the steel column 1 without causing any misalignment between the upper diaphragm 10 and the upper flange 20 that falls outside the specified range.

[0029] In addition, in the beam-column joint structure exemplified in this embodiment, the pre-attached backing metal 23 is inserted into the notched groove 22B of the beam end 2A during the manufacturing process of the H-beam 2 and welded to the underside of the upper flange 20 at the beam end 2A, so that the H-beam 2 can be turned upside down when the pre-attached backing metal 23 is welded to the beam end 2A. This allows the pre-attached backing metal 23 to be easily welded to the underside of the upper flange 20 at the beam end 2A by downward welding, which is expected to have stable quality.

[0030] Therefore, during the construction process of welding the beam end 2A of the H-shaped beam 2 to the steel column 1, it is possible to eliminate the need for upward welding, which is difficult and for which very few people are qualified, but which was previously required when welding a backing metal to the underside of the upper flange 20 at the beam end 2A.

[0031] Moreover, the pre-attached backing metal 23 and the post-attached backing metal 24 have a flange width direction length as a whole that corresponds to the flange width W of the upper flange 20, while the flange width direction length L1 of the pre-attached backing metal 23 is shorter than the flange width W of the upper flange 20. Therefore, even if there is a construction error in the inclination of the steel column 1 that is erected in advance during the erection process or the upper diaphragm 10 is bent, the gap between the upper diaphragm 10 of the steel column 1 and the pre-attached backing metal 23 on the H-beam 2 side can be prevented from exceeding the allowable range. The gap between the upper diaphragm 10 and the post-attached backing metal 24 can be easily adjusted to within the allowable range when the post-attached backing metal 24 is temporarily welded to the underside of the upper flange 20.

[0032] Furthermore, since the length L1 in the flange width direction of the pre-attached backing metal 23 is longer than the thickness t1 at the upper end of the web 22 including the remaining portion 22Da of the fillet 22D, it becomes easier to weld the pre-attached backing metal 23 to the upper end of the web 22 of the beam end 2A by downward welding with the H-shaped beam 2 turned upside down.

[0033] As a result, it is possible to eliminate the need for difficult upward welding, while preventing the occurrence of the inconvenience of the gap between the upper diaphragm 10 of the steel column 1 and each backing metal 23, 24 on the H-shaped beam 2 exceeding the allowable range.

[0034] According to the beam-column joint structure exemplified in this embodiment, in the erection process, the pre-attached backing metal 23 can be attached to the upper diaphragm 10 of the steel column 1 while absorbing the difference d1 between the thickness t2 of the upper diaphragm 10 and the thickness t3 of the upper flange 20, and the overlapping portion 23C (see Figs. 1 and 2) overlapping vertically with the lower surface of the upper diaphragm 10 is secured. Also, each post-attached backing metal 24 can be attached to the upper diaphragm 10 while the column side end surface 24B of the post-attached backing metal 24 is abutted against the beam side end surface 10A of the upper diaphragm 10, while the overlapping portion 24A (see Figs. 1 and 2) overlapping vertically with the lower surface of the upper flange 20 is secured.

[0035] As a result, even though the root gap g between the upper diaphragm 10 and the upper flange 20 differs depending on the thicknesses t2, t3 of the upper diaphragm 10 and the upper flange 20 and the groove shape, etc., the variation in the root gap g can be easily absorbed by using pre-attached backing metal 23 or post-attached backing metal 24 that have the same length in the root gap direction.

[0036] Furthermore, since the steel column 1 is equipped with the above-mentioned height adjustment mechanism 3, the height position of the upper flange 20 relative to the upper diaphragm 10 can be easily and accurately adjusted by driving a pair of splitters 30 between each support plate 14 on the steel column 1 side and the lower flange 21 of the H-shaped beam 2, thereby avoiding the risk of misalignment between the upper diaphragm 10 and the upper flange 20 falling outside the specified range.

[0037] [Another embodiment] Another embodiment of the present invention will now be described. The configurations of the respective alternative embodiments described below are not limited to being applied alone, but may also be applied in combination with the above-described embodiment or other alternative embodiments.

[0038] (1) In the above embodiment, the pre-attached backing metal 23 is exemplified as being formed integrally with the thick plate portion 23A and the thin plate portion 23B. However, the present invention is not limited to this. For example, as shown in FIGS. 5 to 6, the pre-attached backing metal 23 may be divided into the thick plate portion 23A and the thin plate portion 23B. When the pre-attached backing metal 23 is divided into the thick plate portion 23A and the thin plate portion 23B in this way, if there are multiple column-beam joints where the difference between the thickness t2 of the upper diaphragm 10 and the thickness t3 of the upper flange 20 is different, this can be easily dealt with by changing the combination of the thick plate portion 23A and the thin plate portion 23B so as to obtain the step d1 corresponding to these differences. The combination of the thick plate portion 23A and the thin plate portion 23B is determined and welded together in the manufacturing process of the H-shaped beam 2. 5 and 6, the thick plate portion 23A and the thin plate portion 23B are divided on an extension line of the groove surface forming the groove portion 20A of the upper flange 20. The thick plate portion 23A is formed into a trapezoid with one side inclined at the same angle as the groove angle of the groove portion 20A of the upper flange 20 when viewed in the flange width direction. The thin plate portion 23B is formed into an inverted trapezoid with one side inclined at the same angle as the groove angle of the groove portion 20A of the upper flange 20 when viewed in the flange width direction.

[0039] (2) In the above alternative embodiment (1), the pre-attached backing metal 23 is exemplified as being divided into a thick plate portion 23A having a trapezoidal shape when viewed in the flange width direction and a thin plate portion 23B having an inverted trapezoidal shape when viewed in the flange width direction. However, the present invention is not limited to this and may be, for example, divided into a thick plate portion 23A and a thin plate portion 23B having a rectangular shape when viewed in the flange width direction.

[0040] (3) In the above embodiment, the height adjustment mechanism 3 is exemplified as being constituted by a pair of splitters 30 that are driven between a pair of support plates 14 on the steel column 1 side and the lower flange 21 of the H-shaped beam 2. However, this is not limited to this. For example, as shown in FIG. 5, instead of the pair of support plates 14, a pair of support members 15 made of L-shaped steel or the like having a top plate portion 15A and a vertical wall portion 15B may be welded to the steel column 1, and the height adjustment mechanism 3 may be constituted by a pair of bolts 31 that are screwed from below into screw holes 15C formed in the top plate portions 15A of these support members 15. In this configuration, by screwing each bolt 31 into each support member 15, the height position of the H-shaped beam 2 relative to the steel column 1 can be adjusted more easily and accurately. [Explanation of symbols]

[0041] 1 Steel column 2 H-beam 2A beam end 3 Height adjustment mechanism 10 Upper diaphragm 11 Lower diaphragm 20 Upper flange 22 Web 22B Notched groove 22C Scallop 22D Fillet 22Da residual part 23 Pre-attached backing plate 23A Thick plate section 23B Thin plate part 24 Retrofit backing plate L1 Length of pre-attached backing plate in the flange width direction L2 Length of the retrofit backing plate in the flange width direction L3 Length of protrusion from upper flange of pre-attached backing plate L4: The horizontal length of the cross section of the rear end backing plate as viewed in the flange width direction W Flange width of upper flange d1 Step d2 Distance between the bottom surface of the upper flange and the top end of the web in the notched groove d3 Distance between the bottom surface of the upper diaphragm and the top end of the web during the erection process g Root gap t1 Thickness at the top of the web t2 Thickness of upper diaphragm 10 t3 Thickness of upper flange 20

Claims

1. A column-beam joint structure in which an end of an H-shaped beam having a scallop formed at the lower end of the web to enable on-site welding to a steel column having an upper diaphragm and a lower diaphragm is welded to the steel column at a construction site, In the manufacturing process of the H-shaped beam, a pre-attached backing metal for column-beam welding is inserted into a notch groove formed at the upper end of the web at the beam end and welded to the lower surface side of the upper flange at the beam end; In the erection process of welding the beam end to the steel column, a pair of post-attached backing metals for column-beam welding are aligned and temporarily welded to both ends in the flange width direction on the underside of the upper flange, the pre-attached backing metal has a length in the flange width direction that is longer than a thickness at an upper end of the web including a remaining portion of a fillet that remains on both sides of the web after the notch groove is formed, and is set to a length shorter than a flange width of the upper flange; the post-attached backing metal has a length in the flange width direction set to a length extending from an end of the pre-attached backing metal in the flange width direction to an end of the upper flange in the flange width direction, the pre-attached backing metal has a step corresponding to a difference between a thickness of the upper diaphragm and a thickness of the upper flange, and a protruding length from the upper flange is set to be longer than a root gap between the upper diaphragm and the upper flange, The post-installed backing plate has a cross-sectional shape when viewed in the width direction of the flange that is a horizontally long rectangle without any steps, and its horizontal length is set longer than the root gap in this column-beam joint structure.

2. A column-beam connection structure in which an end portion of an H-shaped beam having a scallop formed at the lower end of the web to enable on-site welding to a steel column having an upper diaphragm and a lower diaphragm is welded to the steel column at a construction site, In the manufacturing process of the H-shaped beam, a pre-attached backing metal for column-beam welding is inserted into a notch groove formed at the upper end of the web at the beam end and welded to the lower surface side of the upper flange at the beam end; In the erection process of welding the beam end to the steel column, a pair of post-attached backing metals for column-beam welding are aligned and temporarily welded to both ends in the flange width direction on the underside of the upper flange, the pre-attached backing metal has a length in the flange width direction that is longer than a thickness at an upper end of the web including a remaining portion of a fillet that remains on both sides of the web after the notch groove is formed, and is set to a length shorter than a flange width of the upper flange; the post-attached backing metal has a length in the flange width direction set to a length extending from an end of the pre-attached backing metal in the flange width direction to an end of the upper flange in the flange width direction, A column-beam joint structure in which the pre-attached backing metal is divided into a thick plate portion corresponding to the distance between the underside of the upper flange and the upper end of the web in the cutout groove, and a thin plate portion corresponding to the distance between the underside of the upper diaphragm and the upper end of the web during the construction process.

3. The column-beam joint structure according to claim 1 or 2, wherein the steel column is provided with a height adjustment mechanism that enables adjustment of the height position of the upper surface of the pre-attached backing plate relative to the lower surface of the upper diaphragm during the construction process.

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