JPH1122000A - Column and beam joint structure and building unit - Google Patents

Abstract

(57) [Problem] To join a beam to a column, to shorten the welding length, shorten the welding time, and improve the welding workability while securing the joint strength. SOLUTION: In a joint structure of a column 11 and a beam 12, at least a part of an end portion including upper and lower flanges 12A and 12B of the beam 12 is provided with a welded cross-sectional enlarged portion 21, and the end of the beam 12 is placed on the side of the column 11 At least the upper and lower flange corresponding portions 2 of the welded cross-section enlarged portion 21 without being welded to the entire circumference of the portion.
2A and 22B are welded to the side of the pillar 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure between a column and a beam and a building unit.

[0002]

2. Description of the Related Art Conventionally, there is a building unit as described in JP-B-56-51257. The building unit is a framed structure consisting of a steel pipe column, a shaped steel floor beam and a shaped steel ceiling beam assembled in a box shape, and the ends of the floor beam and ceiling beam are welded to the side of the column. Can be configured.

[0003] However, a section steel column such as a floor beam or a ceiling beam is provided with upper and lower flanges and a web, and the end of this beam is butt-welded to the side of the column.

[0004]

However, the prior art has the following problems. (1) Since the entire periphery of the end of the beam, that is, the entire periphery of the upper and lower flanges and the web is welded to the side of the column, the welding length is long and the welding time is long.

(2) In the case where the beam is fixed and welded, the welding position changes variously along the circumferential direction of the beam. Conversely, in order to enable welding in the same welding position, the beam must be fixed. It is necessary to rotate and weld, and the welding workability is poor.

SUMMARY OF THE INVENTION It is an object of the present invention to shorten the welding length, shorten the welding time, and improve the welding workability while securing the joint strength when joining a beam to a column.

[0007]

SUMMARY OF THE INVENTION According to the present invention, there is provided a column and beam joint structure for welding the ends of a beam having upper and lower flanges to side portions of the column. At least a portion of the end portion includes a weld cross-sectional enlarged portion,
At least the upper and lower flange-corresponding portions of the enlarged weld cross-section are welded to the side of the column without welding the end of the beam to the side of the column.

According to a second aspect of the present invention, in the first aspect of the present invention, further, the welded cross-sectional enlarged portion of the beam includes:
The beam base material is processed to be thick.

According to a third aspect of the present invention, in the first aspect of the present invention, further, the enlarged welded section of the beam includes:
It is configured by adding a beam end piece to a beam base material.

The present invention described in claim 4 is the first to third aspects of the present invention.
In the present invention described in any of the above, further, the beam includes upper and lower flanges and a side plate portion, and a weld cross-sectional enlarged portion is provided at some ends including the upper and lower flanges and the side plate portion of the beam; The upper and lower flange corresponding portions and side plate portion corresponding portions of the enlarged portion are welded to the side portions of the pillar.

According to a fifth aspect of the present invention, in the fourth aspect of the present invention, the beam is a lip channel steel, and the beam end piece has a U-shaped cross section. And a closing part for closing one end opening of the connection body, and an enlarged welding cross-section is provided along the width direction of the column at the upper end of the closing part.

According to a sixth aspect of the present invention, in the fifth aspect of the present invention, the length of the enlarged welded section is longer than the width of the upper and lower flanges of the beam. is there.

The present invention described in claim 7 provides the invention according to claims 1 to 6
In the present invention described in any one of the above, further, an inner diaphragm is provided in a cross section corresponding to a flange joint portion of a beam at a longitudinal middle portion of the column.

[0014] The present invention according to claim 8 is characterized in that:
In a building unit obtained by welding the ends of beams having upper and lower flanges, a joint structure between a column and a beam according to any one of claims 1 to 6 is used.

[0015]

According to the first aspect of the present invention, the following (1) to
(3). (1) Since only the part including the upper and lower flanges is welded to the side of the column without welding the entire end of the beam to the side of the column, the welding length is shortened and the welding time is reduced. Can be shortened.

(2) Since only the part including the upper and lower flanges of the beam is welded to the side of the column, even if the beam is fixed and welded, the welding position does not change in various ways, and the welding workability is improved. Can be improved.

(3) A part of the beam including the upper and lower flanges, which is welded to the side of the column, is an enlarged weld cross section. Therefore, although the entire periphery of the end of the beam is not a welded portion, the cross-sectional rupture strength of the welded portion whose weld cross-sectional area has been expanded by the weld cross-sectional enlarged portion can be made larger than the maximum proof stress of the beam base material. In addition, the joint strength between the column and the beam can be secured.

According to the present invention described in claim 2, the following (4)
Has the effect of (4) By thickening the beam base material, the weld cross-sectional enlarged portion of (3) can be formed.

According to the third aspect of the present invention, the following (5)
Has the effect of (5) By adding a beam end piece to the beam base material, the weld cross-sectional enlarged portion of (3) can be formed.

According to the present invention described in claim 4, the following (6)
Has the effect of (6) A portion of the beam including the upper and lower flanges and the side plate portion, which is welded to the side portion of the column, is an enlarged weld cross section. Therefore, the weld length of the enlarged weld cross section extends to the side plate portion side as well as the flange, and as a result, the weld sectional area can be increased without increasing the thickness ratio of the enlarged weld cross section. Thereby, the cross-sectional rupture strength of the welded portion having the enlarged welded cross-sectional area can be made larger than the maximum proof stress of the beam base material, and the joint connection strength between the column and the beam can be secured.

According to the present invention described in claim 5, the following (7)
Has the effect of (7) The beam is a lip channel steel, and the beam end piece is provided with a connection body having a U-shaped cross section and a closing portion for closing one end opening of the connection body, and is welded to an upper end of the closing portion. An enlarged section is provided. Therefore, the torsional deformation of the beam end can be prevented. Thereby, the breaking strength of the welded portion due to torsion can be increased.

According to the present invention described in claim 6, the following (8)
Has the effect of (8) The length of the enlarged weld cross section is longer than the width of the upper and lower flanges of the beam. Therefore, the enlarged weld cross-section that protrudes from both sides from the flange end of the beam acts as an end tab, and the stress of the beam is not directly transmitted to this end tab equivalent part, so even if there is a minute notch at the start and end of the weld. However, the weld does not break.

According to the present invention described in claim 7, the following (9)
Has the effect of (9) Since the inner diaphragm is provided in the cross section of the part where the beam of the column is joined, the sectional strength of the column is improved, the deformation resistance to stress concentration is improved, and the rigidity of the joint between the column and the beam Can be improved.

According to the present invention described in claim 8, the following (10)
Has the effect of (10) Realize the above (1) to (9) at the joint between the column and beam in the building unit, and secure the joint strength while maintaining
The welding length can be shortened, the welding time can be shortened, and the welding workability can be improved.

[0025]

FIG. 1 is a schematic diagram showing a building unit, FIG. 2 is a schematic diagram showing a first embodiment, FIG. 3 is a schematic diagram showing an enlarged welded section of a beam and a welded portion, and FIG. FIG. 5 is a schematic diagram illustrating a third embodiment, FIG. 6 is a schematic diagram illustrating a fourth embodiment, and FIG. 7 is a schematic diagram illustrating a fifth embodiment.

As shown in FIG. 1, each of the building units 10 includes four steel pipe columns 11, four steel beams 12, and one ceiling beam 1.
3 is a skeleton structure assembled in a box shape, and is constructed by welding a floor beam 12 to the lower end side of the column 11 and a ceiling beam 13 to the upper end side of the column 11. The floor beam 12 includes upper and lower flanges 12A and 12B, a web 12C, and upper and lower lips 12D and 12E. The ceiling beam 13 includes upper and lower flanges 13A and 13B, a web 13C, and upper and lower lips 13D and 13E (not shown).

However, the present invention relates to a joint structure of the floor beam 12 or the ceiling beam 13 to the column 11. Hereinafter, pillar 11
The joint structure of the floor beam 12 with respect to is described. Pillar 11
And the joint structure of the ceiling beam 13 can be substantially the same.

(First Embodiment) (FIGS. 2 and 3) The joints of the floor beams 12 to the columns 11 are as follows (1) and (2). In the present embodiment, the inner diaphragm 11A is dropped and welded in a cross section corresponding to a joint portion of the upper flange 12A of the floor beam 12 at an intermediate portion on the lower end side of the column 11. The inner diaphragm 11A has the same contour as the inner peripheral shape of the column 11, and is welded to the inner periphery of the column 11. Further, an end plate 11B is welded to the cross section corresponding to the joint of the lower flange 12B of the floor beam 12 at the lower end of the column 11. The end plate 11B has the same contour as the outer peripheral shape (or inner peripheral shape) of the pillar 11,
Is welded to the end surface of the column 11 so as to close the end surface of the column.

(1) Upper and lower flanges 12A and 1A of the floor beam 12
At least a part of the end including 2B, in the present embodiment, the entire weld cross section 21 is provided (FIG. 3). The enlarged welding section 21 is formed by thickening the end of the floor beam 12.
This is the thickness t1 of the welded cross-section enlarged portion 21 with respect to the base material thickness t0 of the floor beam 12.

In the present embodiment, the upper and lower flanges 12 of the enlarged welded section 21 provided at the end of the floor beam 12 are provided.
Only the portions corresponding to A and 12B are provided as welded portions 22A and 22B to be welded to the column 11. The enlarged welding section 21 provided on the floor beam 12 may be formed only in a limited portion of the end of the floor beam 12 to be the welded portions 22A and 22B.

(2) The end of the floor beam 12 is not welded to the side of the pillar 11 at the entire circumference, and the above-mentioned portion defined at the portion corresponding to the upper and lower flanges 12A and 12B of the enlarged welded cross-section 21 is used. The welds 22 </ b> A and 22 </ b> B are welded to the side of the column 11.

The welded portion 22A of the upper flange 12A of the floor beam 12 is welded on the side of the column 11 to a portion corresponding to the inner diaphragm 11A. Also, the lower flange 12B of the floor beam 12
The welded portion 22B of the end plate 11B
Weld to the part corresponding to.

At this time, the sectional breaking strength Z1 of the above-described welded portions 22A and 22B at the joint between the column 11 and the floor beam 12 is set.
Is calculated so that Z1 is larger than the maximum proof stress M of the beam base material of the floor beam 12 (the welding thickness t1 (same as the thickness t1 of the enlarged welding section 21) of the welded portions 22A and 22B). The welding length b) is determined. Thereby, the floor beam 12
It is possible to prevent the welds 22A, 22B from breaking before the maximum strength is reached. That is, Table 1 shows a specific example of the joint between the column 11 and the floor beam 12 according to the first embodiment. In each example of Table 1, Z1> M is satisfied.

[0034]

[Table 1]

Therefore, according to the present embodiment, the following (1) to
(6). (1) Since only the part including the upper and lower flanges 12A and 12B is welded to the side portion of the pillar 11 without welding the entire end of the floor beam 12 to the side portion of the pillar 11, The welding length can be shortened and the welding time can be shortened.

(2) Upper and lower flanges 12A and 1A of the floor beam 12
Since only a part including 2B is welded to the side portion of the column 11, even when the floor beam 12 is fixed and welded, the welding workability can be improved without variously changing the welding posture.

(3) Upper and lower flanges 12A and 1A of the floor beam 12
A portion including 2B, which is welded to the side portion of the column 11, is a welded cross-section enlarged portion 21. Accordingly, although the entire periphery of the end of the floor beam 12 is not made to be the welded portions B22A and 22B, the sectional break strength of the welded portions 22A and 22B whose welded sectional areas have been enlarged by the welded sectional enlarged portion 21 is determined by the beam base material. And the joint strength between the column 11 and the floor beam 12 can be secured.

(4) By thickening the beam base material, the weld cross-sectional enlarged portion 21 of (3) can be formed.

(5) Since the inner diaphragm 11A is provided in the cross section of the portion where the floor beam 12 of the column 11 is joined, the cross-sectional strength of the column 11 is improved, and the deformation resistance to stress concentration is improved. The rigidity of the joint between the floor beam 11 and the floor beam 12 can be improved.

(6) The above-mentioned (1) to (5) are realized in the joint between the column 11 and the floor beam 12 in the building unit 10, and the welding length is shortened and the welding time is shortened while securing the joint strength. It can be shortened and the welding workability can be improved.

(Second Embodiment) (FIG. 4) In the second embodiment, the joint of the floor beam 12 to the column 11 is as follows (1) and (2). (1) At least a part of the end including the upper and lower flanges 12A and 12B, the web 12C, and the upper and lower lips 12D and 12E of the floor beam 12, and in the present embodiment, the entire weld cross-section enlarged portion 31
Is provided (FIG. 4). The enlarged welding section 31 is formed by thickening the end of the floor beam 12. Base material thickness t of floor beam 12
0 is the thickness t1 of the enlarged weld cross-section 31.

In this embodiment, the upper and lower flanges 12 of the enlarged welded section 31 provided at the end of the floor beam 12 are provided.
A, 12B, the upper and lower portions of the web 12C, and only the portions corresponding to the upper and lower lips 12D, 12E, are welded to the column 11 by welding portions 32A, 32B, 32C, 32D, 3D.
Served as 2E. The enlarged welding section 31 provided on the floor beam 12 is formed by welding portions 32 </ b> A to 32 </ b> A of the ends of the floor beam 12.
It may be limitedly formed only on the portion that becomes E.

(2) The upper and lower flanges 12A, 12B, the web 12C, the upper and lower lips 12D, and the upper and lower lips 12D of the welded cross-section enlarged portion 31 are not welded to the end of the floor beam 12 to the side of the column 11 all around. Welded part 32 defined in the part corresponding to 12E
A to 32E are welded to the sides of the pillar 11.

The welded portion 32A of the upper flange 12A of the floor beam 12 is welded on the side of the column 11 to a portion corresponding to the inner diaphragm 11A. Also, the lower flange 12B of the floor beam 12
The welding portion 32B of the end plate 11B
Weld to the part corresponding to.

At this time, the sectional breaking strength Z1 of the above-mentioned welded portions 32A to 32E at the joint between the column 11 and the floor beam 12 is determined.
The welding cross-sectional area (weld thickness t1 (same as the thickness t1 of the enlarged welded section 31) of the welded portions 32A to 32E such that Z1 is larger than the maximum beam strength M of the beam base material of the floor beam 12 is calculated. The lengths b, h) are determined. Thereby, before the floor beam 12 reaches the maximum proof stress, the welded portions 32A to 32E are formed.
Can be prevented from breaking. That is, Table 2 shows a specific example of the joint between the column 11 and the floor beam 12 according to the second embodiment.
It becomes as follows. In each example of Table 2, Z1> M holds.

According to Table 2, it can be seen that in the second embodiment, a larger cross-sectional breaking strength Z1 can be ensured in the second embodiment, as compared with the first embodiment, while reducing the enlargement ratio of the thickness t1 of the welded cross-section enlarged portion 31. Can be

[0047]

[Table 2]

Therefore, according to the present embodiment, the following (1) to
(7). (1) Since only the part including the upper and lower flanges 12A and 12B is welded to the side portion of the pillar 11 without welding the entire end of the floor beam 12 to the side portion of the pillar 11, The welding length can be shortened and the welding time can be shortened.

(2) Upper and lower flanges 12A, 1
Since only a part including 2B is welded to the side portion of the column 11, even when the floor beam 12 is fixed and welded, the welding workability can be improved without variously changing the welding posture.

(3) Upper and lower flanges 12A, 1
A portion including 2B, which is welded to the side portion of the column 11, is a welded cross-section enlarged portion 31. Therefore, although the entire circumference of the end of the floor beam 12 is not the welded portion 32A to 32E,
The cross-sectional rupture strength of the welded portions 32A to 32E whose weld cross-sectional area has been expanded by the weld cross-sectional enlarged portion 31 can be made larger than the maximum proof stress of the beam base material, and the joint connection strength between the column 11 and the floor beam 12 can be secured. .

(4) By thickening the beam base material, the enlarged welded section 31 of (3) can be formed.

(5) Upper and lower flanges 12A and 1A of the floor beam 12
2B and side plate (web 12C, lip 12D, 12E)
The part to be welded to the side of the column 11 is a welded cross-section enlarged part 31. Therefore, the weld section enlarged portion 3
The welding length of not only the flange but also the side plate (web 12
C, the lip 12D, 12E) also spreads, and as a result, the weld cross-sectional area can be enlarged without increasing the thickness ratio of the weld cross-sectional enlarged portion 31 so much. Thereby, the cross-sectional rupture strength of the welded portions 32A to 32E having the enlarged welded cross-sectional area can be made larger than the maximum proof stress of the base material of the floor beam 12.
1 and the joint strength of the floor beam 12 can be secured.

(6) Since the inner diaphragm 11A is provided in the cross section of the portion of the pillar 11 to which the floor beam 12 is joined, the sectional strength of the pillar 11 is improved, and the deformation resistance to stress concentration is improved. The rigidity of the joint between the floor beam 11 and the floor beam 12 can be improved.

(7) The above-mentioned (1) to (6) are realized in the joint between the column 11 and the floor beam 12 in the building unit 10, and the welding length is shortened and the welding time is shortened while securing the joint strength. It can be shortened and the welding workability can be improved.

(Third Embodiment) (FIG. 5) In the third embodiment, the joints of the floor beams 12 to the columns 11 are as follows (1) and (2). (1) At least a part of the end including the upper and lower flanges 12A and 12B of the floor beam 12, in the present embodiment, the flange 12
Upper and lower weld cross-sectional enlarged portions 41 are provided in the portions A and 12B (FIG. 5). The enlarged welding section 41 is configured by adding a beam end piece 42 made of a thick plate at the tip to the end of the floor beam 12. With respect to the base material thickness t0 of the floor beam 12, the thickness t1 of the distal end portion 42A to be welded to the column 11 of the beam end piece 42 and the welding length b are the welding length b.

In the present embodiment, the tip 42A serving as the welded portion 43 of the beam end piece 42 is provided with a groove for butt welding to the side of the column 11.
Then, the beam end piece 42 is fillet welded to the inner surface of the flange of the floor beam 12 with the welding length 1 at both sides 42B, 42B and the welding length b at the end 42C. At this time, assuming that the moment applied to the end of the floor beam 12 at the joint with the column 11 is borne by the upper and lower flanges 12A and 12B, the flange 12
Since the tensile force based on this moment acts on A and 12B, the welding is performed so that the allowable shear stress degree of the welding seam (weld length 1) of the side portions 42B and 42B of the beam end piece 42 becomes larger than this tensile force. It is necessary to set the length l and the like.

(2) The welded portion 43 of the beam end piece 42 forming the welded cross-sectional enlarged portion 41 is not welded to the end of the floor beam 12 to the side of the pillar 11 all around. 11
Weld to the side. In addition, the welding part 43 of the beam end piece 42 provided on the upper flange 12A of the floor beam 12 is welded to a portion corresponding to the inner diaphragm 11A on the side of the pillar 11. Also, the welded portion 43 of the beam end piece 42 provided on the lower flange 12B of the floor beam 12 is
Weld to the part corresponding to 1B.

At this time, the sectional breaking strength Z 1 of the welded portion 43 of the beam end piece 42 at the joint between the column 11 and the floor beam 12 is calculated, and this Z 1 is calculated from the maximum strength M of the floor beam 12 by the beam base material. The weld cross-sectional area (weld thickness t1, weld length b) of the welded portion 43 of the beam end piece 42 is determined so as to increase. Accordingly, it is possible to prevent the welded portion 43 of the beam end piece 42 from breaking before the floor beam 12 reaches the maximum strength.

Therefore, according to the present embodiment, the following (1) to
(6). (1) Since only the part including the upper and lower flanges 12A and 12B is welded to the side portion of the pillar 11 without welding the entire end of the floor beam 12 to the side portion of the pillar 11, The welding length can be shortened and the welding time can be shortened.

(2) Upper and lower flanges 12A, 1
Since only a part including 2B is welded to the side portion of the column 11, even when the floor beam 12 is fixed and welded, the welding workability can be improved without variously changing the welding posture.

(3) Upper and lower flanges 12A, 1
A portion including 2B, which is welded to the side portion of the column 11, is an enlarged weld cross section 41. Therefore, although the entire circumference of the end of the floor beam 12 is not used as the welded portion 43, the cross-sectional rupture strength of the welded portion 43 whose welding cross-sectional area is enlarged by the welded cross-sectional enlarged portion 41 is calculated from the maximum strength of the beam base material. The joint strength between the pillar 11 and the floor beam 12 can be secured.

(4) By adding the beam end piece 42 to the beam base material, the weld cross-sectional enlarged portion 41 of (3) can be formed.

(5) Since the inner diaphragm 11A is provided in the cross section of the portion where the floor beam 12 of the column 11 is joined, the cross-sectional strength of the column 11 is improved, and the deformation resistance to stress concentration is improved. The rigidity of the joint between the floor beam 11 and the floor beam 12 can be improved.

(6) The above-mentioned (1) to (5) are realized at the joint between the column 11 and the floor beam 12 in the building unit 10, and the welding length is shortened and the welding time is reduced while securing the joint strength. It can be shortened and the welding workability can be improved.

(Fourth Embodiment) (FIG. 6) In the fourth embodiment, the joint of the floor beam 12 to the column 11 is as follows (1) and (2). (1) At least a part of the end including the upper and lower flanges 12A and 12B, the web 12C, and the upper and lower lips 12D and 12E of the floor beam 12, in this embodiment, the upper and lower flanges 12A and 1E.
Upper and lower weld cross-sectional enlarged portions 51 are provided inside 2B (FIG. 6). The weld cross-section enlarged portion 51 has a U
It is configured by adding a beam end piece 52 having a U-shaped cross section.
The beam end piece 52 has a flat plate portion 52A and both side plate portions 52B,
52B. For the base material thickness t0 of the floor beam 12, the flanges 12A and 12B of the floor beam 12, the web 12C, the lips 12D and 12E, and the flat plate portion 52A and the side plate portion 52B of the beam end piece 52 added thereto are integrally formed. This is the thickness t1 of the welded portion 53 formed as follows.

In the present embodiment, a groove 52A is formed on the tip end 52AA of the beam end piece 52, which is to be a welded portion 53, so as to be butt-welded to the side of the column 11. The beam end piece 52 integrates the side plate portions 52B, 52B and the rear end portion 52AB with the inner surface of the floor beam 12 by fillet welding in advance and integrates the flat plate portion 52A with the flanges 12A, 12B of the floor beam 12. Plug welding is performed at the provided plug welding portion 54 so as to be integrated.
The 2AA and the tip of the floor beam 12 are integrated with each other when they are welded to the side of the column 11 (FIG. 6A). That is, welding of the side portion of the column 11 to the floor beam 12 and the beam end piece 52 is performed by abutting the tip end 52AA of the beam end piece 52 to the side portion of the column 11 (FIG. 6).
(C)).

(2) The above welded portion 53 formed by the enlarged welded section 51 together with the end of the floor beam 12 without welding the edge of the floor beam 12 to the side of the column 11 all around. , And welded to the side of the column 11. The upper flange 12 of the floor beam 12
Welded part 5 formed by beam end piece 52 provided near A
3 is welded to the portion corresponding to the inner diaphragm 11A at the side of the column 11. Further, the welded portion 5 formed by the beam end piece 52 provided inside the lower flange 12B of the floor beam 12 is provided.
3 is welded to a portion corresponding to the end plate 11B on the side of the column 11.

Therefore, according to the present embodiment, the following (1) to
(6). (1) Since only the part including the upper and lower flanges 12A and 12B is welded to the side portion of the pillar 11 without welding the entire end of the floor beam 12 to the side portion of the pillar 11, The welding length can be shortened and the welding time can be shortened.

(2) Upper and lower flanges 12A and 1A of the floor beam 12
Since only a part including 2B is welded to the side portion of the column 11, even when the floor beam 12 is fixed and welded, the welding workability can be improved without variously changing the welding posture.

(3) Upper and lower flanges 12A and 1A of the floor beam 12
A portion including 2B, which is welded to the side portion of the column 11, is a welded cross-section enlarged portion 51. Therefore, although the entire periphery of the end of the floor beam 12 is not the welded portion 53, the cross-sectional rupture strength of the welded portion 53 whose welded cross-sectional area is enlarged by the welded cross-sectional enlarged portion 51 is determined from the maximum strength of the beam base material. The joint strength between the pillar 11 and the floor beam 12 can be secured.

(4) By adding the beam end piece 52 to the beam base material, the enlarged welding section 51 of (3) can be formed.

(5) Since the inner diaphragm 11A is provided in the cross section of the portion where the floor beam 12 of the column 11 is joined, the cross-sectional strength of the column 11 is improved, and the deformation resistance to stress concentration is improved. The rigidity of the joint between the floor beam 11 and the floor beam 12 can be improved.

(6) The above-mentioned (1) to (5) are realized at the joint between the column 11 and the floor beam 12 in the building unit 10, and the welding length is shortened and the welding time is reduced while securing the joint strength. It can be shortened and the welding workability can be improved.

(Fifth Embodiment) (FIG. 7) The fifth embodiment of FIG. 7 is different from the fourth embodiment in that a beam end piece is provided inside each of the upper and lower flanges 12A and 12B of the floor beam 12. Beam end piece 6 instead of 52
1 has been provided. The beam end piece 61 has a U-shaped cross section having a flat plate portion 62A and both side plate portions 62B, 62B, and a tip portion 62AA is thicker than other portions. The beam end piece 61 is configured to weld the thick end portion 62AA to the side portion of the column 11 as a thick welded portion 63.

(Sixth Embodiment) (FIGS. 8 to 15) The sixth embodiment of FIG. 12 differs from the fourth embodiment in that the upper and lower flanges 12A of the floor beam 12 made of lip channel steel,
In other words, beam end pieces 72, 72 instead of the beam end pieces 52 are provided inside the respective parts closer to 12B.

As shown in FIG. 8, the beam end piece 72 has a connection main body 73 having a U-shaped cross section, and a closing portion 74 for closing one end opening of the connection main body 73. The connection main body 73 includes a flat plate portion 73A and both side plate portions 73B and 73B, and has an outer surface substantially coincident with the upper and lower inner surfaces of the floor beam 12. As shown in FIGS. 9 and 10, a groove 731 having a semicircular cross section is formed at the end of the connection body 73 on the closing portion 74 side.
Are provided over the flat plate portion 73A and both side plate portions 73B and 73B.

At the upper end of the closing portion 74, a welded cross-sectional enlarged portion 74A having a deformed square cross section is integrally provided along the lateral width direction of the column 11. 11 and 13, the length of the welded cross-section enlarged portion 74A is longer than the width of the upper and lower flanges 12A and 12B of the floor beam 12, while being longer than the width of the side portion of the column 11. It has been shortened. The connecting portion 74B between the weld cross-sectional enlarged portion 74A and the closing portion 74 has a tapered thickness. The beam end piece 72 is formed by welding the tip end portion 741A of the enlarged welded section 74A to the side of the column 11 as a thick welded portion. For the base material thickness t0 of the floor beam 12, the tip end portion 741 which is welded to the side portion of the column 11 of the beam end piece 72 to form a welded portion 75
A thickness t1 of A and welding length b.

As shown in FIGS. 13 and 14, the connection main body 73 of the beam end piece 72 is inserted and arranged in the upper and lower ends of the floor beam 12, and the semi-circular groove 731 is used to raise and lower the floor beam 12. The flat portion 73 of the connection body 73 is welded to the end face.
A and a part of the front end side of both side plate portions 73B, 73B
The beam end piece 72 is fixed to the upper and lower ends of the floor beam 12 by welding to the inner side of the inner side of the upper and lower ends of the floor beam 12.

The end of the floor beam 12 is not entirely welded to the side of the column 11, and the welded cross-section enlarged portion 74 is not welded.
The welded portion 75 of the beam end piece 72 constituting A is welded to the side portion of the column 11 (see FIGS. 13 to 15). still,
Beam end piece 7 provided on upper flange 12A of floor beam 12
2 at the side of the pillar 11 with the inner diaphragm 11A
To weld. Further, the welded portion 73 of the beam end piece 72 provided on the lower flange 12B of the floor beam 12 is welded to a portion corresponding to the end plate 11B on the side of the column 11.

Therefore, according to the present embodiment, there are the following operations (1) and (2) in addition to the operation of the above embodiment. (1) The floor beam 12 is a lip channel steel, and the beam end piece 72 is provided with a connection body 73 having a U-shaped cross section and a closing portion 74 for closing one end opening of the connection body. 74
The welded cross-section enlarged portion 74 having a deformed square cross-section at the upper end
Since A is provided, the torsional deformation of the end of the floor beam 12 can be prevented. Thereby, the breaking strength of the welded portion 75 due to torsion can be increased.

(2) Since the length of the enlarged welding section 74A is longer than the width of the upper and lower flanges 12A and 12B of the floor beam 12, the enlarged welding section extending to both sides from the flange end of the floor beam 12 is provided. The portion 74A serves as an end tab, and the stress of the floor beam 12 is not directly transmitted to the end tab equivalent portion, and even if a minute notch is present at the beginning and end of welding, the welded portion 75 may be broken. Absent.

Although the embodiments of the present invention have been described in detail with reference to the drawings, the specific configuration of the present invention is not limited to the embodiments, and the design may be changed without departing from the scope of the present invention. The present invention is also included in the present invention. For example, the building unit of the present invention may be a unit in which a floor beam is joined to a column and has no ceiling beam, or a unit in which a ceiling beam is joined to a column and has no floor beam.

The present invention is not limited to building units,
It can be widely used as a joint structure between pillars and beams of general buildings.

[0084]

As described above, according to the present invention, when joining a beam to a column, the welding length is shortened, the welding time is shortened, and the welding workability is improved while securing the joint strength. be able to.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a building unit to which the present invention is applied.

FIG. 2 is a schematic diagram showing a first embodiment of the present invention.

FIG. 3 is a schematic view showing an enlarged weld cross section and a weld in FIG. 2;

FIG. 4 is a schematic diagram showing a second embodiment of the present invention.

FIG. 5 is a schematic view showing a third embodiment of the present invention.

FIG. 6 is a schematic diagram showing a fourth embodiment of the present invention.

FIG. 7 is a schematic diagram showing a fifth embodiment of the present invention.

FIG. 8 is a schematic view showing a beam end piece according to a sixth embodiment of the present invention.

FIG. 9 is a sectional view taken along line WW of FIG. 8;

FIG. 10 is a view taken in the direction of the arrow A in FIG. 8;

FIG. 11 is a sectional view taken along line XX of FIG. 8;

FIG. 12 is a front view showing a sixth embodiment of the present invention.

FIG. 13 is a plan view corresponding to FIG.

FIG. 14 is a sectional view taken along line YY of FIG.

FIG. 15 is a sectional view taken along the line ZZ of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Building unit 11 Column 11A Inner diaphragm 12 Floor beam 12A, 12B Flange 12C Web (side plate part) 12D, 12E Rip (side plate part) 13 Ceiling beam 21, 31, 41, 51, 74A Welding section enlarged part 22A, 22B, 32A ~ 32E, 43, 53, 63,
75 Welds 42, 52, 61, 72 Beam end piece

Claims (8)

[Claims] 1. A joint structure of a column and a beam for welding an end of a beam having upper and lower flanges to a side portion of the column, wherein at least a part of an end including the upper and lower flanges of the beam has a weld cross-sectional enlarged portion. A column characterized in that at least the upper and lower flange corresponding portions of the enlarged weld cross-section are welded to the side of the column without welding the entire end of the beam to the side of the column. Beam joint structure. 2. The joint structure between a column and a beam according to claim 1, wherein the enlarged welded section of the beam is formed by thickening a beam base material. 3. An enlarged weld cross section of the beam is formed by adding a beam end piece to a beam base material.
Column and beam joint structure described. 4. The beam has upper and lower flanges and side plate portions, and a weld cross-sectional enlarged portion is provided at a part of the beam including upper and lower flanges and side plate portions, and upper and lower flanges of the weld cross-sectional enlarged portion are provided. The joint structure of a pillar and a beam according to any one of claims 1 to 3, wherein the corresponding portion and the side plate portion corresponding portion are welded to a side portion of the column. 5. The beam is a lip channel steel, and the beam end piece is provided with a port main body having a U-shaped cross section and a closing portion for closing one end opening of the port main body. The joint structure between a column and a beam according to claim 4, wherein an enlarged weld cross section is provided at an upper end portion along a width direction of the column. 6. The joint structure between a column and a beam according to claim 5, wherein the length of the weld cross-sectional enlarged portion is longer than the width of upper and lower flanges of the beam. 7. The joint structure between a pillar and a beam according to claim 1, wherein an inner diaphragm is provided in a cross section corresponding to a flange joint portion of the beam at a longitudinal middle portion of the pillar. 8. A building unit obtained by welding an end of a beam having upper and lower flanges to a side of a column, using the joint structure between a column and a beam according to any one of claims 1 to 6. Building unit.