JPH0711706A - Steel pipe column and beam jointing method - Google Patents

Abstract

PURPOSE:To reduce the number of processes by setting the vertical length of a gusset plate fitted to a steel pipe column to be greater than that of a beam and making the gusset plate penetrate through the cutouts previously made in the upper and lower flanges of the beam. CONSTITUTION:A gusset plate 3 is mounted in position where a columnar steel pipe column 1 is jointed to a beam 2, and the vertical length of the gusset plate 3 is set to be greater than that of the beam 2. In the upper and lower flanges 2a, 2b of the beam 2, cutouts 2K are previously formed through which the upper and lower ends of the vertically mounted gusset plate 3 can penetrate. While the upper and lower ends of the gusset plat 3 is penetrating through the cutouts 2K of the beam 2, the beam 2 is fitted to the steel pipe column 1 and gaps between the cutouts 2K and the upper and lower ends of the gusset plate 3 are filled with welding beads B. As a result, brittle fracture is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of joining a steel pipe column and a beam, and more specifically, a gusset plate is attached to a portion of the steel pipe column where the beam is to be joined, and the upper and lower flanges and the web are connected via the gusset plate. The present invention relates to a method of joining a steel pipe column and a beam for joining an H-shaped steel beam composed of both parts to the beam joining planned portion.

[0002]

2. Description of the Related Art In FIG. 14, upper and lower flanges 2a and 2b and a web 2d are provided at planned beam joining positions of a steel pipe column 1 (cylindrical body).
The conventional method of joining the beam 2 composed of both parts is shown. In this conventional method, the through diaphragms 21 and 22 (that is, the central portion is a partition wall inside the steel pipe pillar 1) at upper and lower ends (corresponding to the planned joining portions of the upper and lower flanges 2a and 2b) of the beam joining planned portion, respectively. Existing and outer peripheral edge is steel pipe column 1
Through diaphragms 21 and 2 projecting outward of the
Attach 2) in advance. In addition, a gusset plate 3 having a length shorter than the mutual distance between the upper and lower through diaphragms 21 and 22 is vertically welded to the other portion of the beam joining scheduled portion. Furthermore, the web 2 at the end of the beam 2 on the joining side
Recesses are formed in the portions corresponding to the upper and lower ends of d. Then, after moving the beam 2 so that the vertical position of the beam 2 coincides with the vertical position of the planned beam joining position, the web 2 of the beam 2 is moved.
The joining side end of d is connected to the tip of the gusset plate 3 by using the high-strength bolt 4. In the connected state, the gusset plate 3 is shortened as described above, and the beam 2 Since the recesses are formed in the upper and lower ends of the web 2d at the joining side end portion of the above, between the upper through diaphragm 21 and the upper surface of the gusset plate 3 and the lower through diaphragm 22.
A space is formed between the gusset plate 3 and the lower surface of the gusset plate 3. Then, the upper through diaphragm 21
The space formed between the upper surface of the gusset plate 3 and the gusset plate 3 is a welding space S (that is, the backing 5 which is necessary for welding (butt welding) the upper flange 2a of the beam 2 and the upper diaphragm 21 on the upper side. Space required for arrangement of the space S)
Becomes Then, the tip ends of the upper and lower flanges 2a, 2b of the beam 2 on the steel pipe column side are passed through the tip portions of the diaphragms 21, 22 to
The beam 2 is joined to the beam joining planned portion by butt welding using the welding space S or the like (but of course, butt welding is performed on both front and rear sides of the gusset plate).

It should be noted that, instead of the above-mentioned through diaphragms 21 and 22, the outer reinforcing diaphragms (specifically, between the outer peripheral edges of the upper and lower diaphragms, at the upper and lower ends of the beam-joining planned portions). A steel pipe column 1 with an H-shaped steel and an external reinforcing diaphragm attached with a reinforcing member similar in cross section.
In the case where the beam 2 is to be joined to the planned beam joining location, and also when the beam 2 is to be joined to the planned beam joining location of the steel tube column 1 (for example, the steel tube column 1 made of a rectangular tube) other than the cylindrical body. The welding space S, which was required during welding in the above-mentioned conventional method, was similarly formed.

Further, FIG. 15 shows a conventional method of joining two types of beams 2 and 2A (hereinafter, referred to as stepped beams) having different vertical lengths to the same planned beam joining position in the steel pipe column 1 (cylindrical body). It is shown. Even at the time of joining the stepped beams, the welding space S was similarly formed in order to join the beam 2 having the longer vertical length to the planned beam joining location.
Moreover, in order to join the beam 2A having a shorter vertical length to the planned beam joining position, one of the flanges of the shorter beam 2A (lower side in FIG. 15) is provided at the intermediate portion in the vertical direction of the gusset plate 3. Diaphragm 23 to be joined to the flange)
It was necessary to form the recessed portion 3a for positioning the outer peripheral edge portion of the diaphragm 23 (which is also attached to the steel pipe column 1 in advance).

[0005]

In each of the above-mentioned conventional methods, the welding space S necessary for the welding is formed, and the presence of the welding space S causes the flanges 2a and 2b to be separated from each other. A non-bonded portion where the web 2d (or the gusset plate 3) is not bonded is generated. The non-bonded portion has a size that cannot be filled in by simply forming a weld bead in a later step, and is a space that remains even in the final stage. Therefore, due to the existence of the non-bonded portion, a secondary bending stress due to a shearing force may be generated in the flanges 2a and 2b directly receiving the beam load, and the flanges 2a and 2b may be brittlely fractured. was there. Further, when joining the stepped beams, it is necessary to form a recessed portion 3a in which the outer peripheral edge portion of the flange of the shorter beam 2A is fitted in the intermediate portion in the vertical direction of the gusset plate 3, and the number of man-hours for processing the material increases. There was a problem. The present invention has been made by paying attention to such an actual situation, and there is a problem of brittle fracture of the upper flange 2a due to the existence of the non-joint portion, a problem of increase in the number of material processing steps at the time of joining the stepped beams, and the like. The purpose is to provide means that can solve all of the above.

[0006]

A method for joining a steel pipe column and a beam according to the present invention (hereinafter referred to as the present invention method) is a method of attaching a gusset plate to a beam joining planned portion of a steel pipe column, and inserting the gusset plate through the gusset plate. A method of joining a steel tube column and a beam for joining an H-shaped steel beam composed of both upper and lower flanges and a web at the planned beam joining location, wherein the vertical length of the gusset plate is set to be smaller than the vertical length of the beam. The upper and lower end portions of the gusset plate attached to the beam joint planned location are formed in advance on the upper and lower flanges by forming notches that can penetrate the upper and lower end portions of the gusset plate in the joining process. While passing through the notch, the beam is attached to the beam-joining planned location, and a melt filling the gap formed between the notch and the upper and lower ends of the gusset plate is filled. By forming the bead, it is characterized by integrating the said and the gusset plate beam.

[0007]

According to the method of the present invention having the above characteristics,
Prior to attaching a beam made of H-shaped steel to a beam joining planned location, the vertical length of a gusset plate previously attached thereto is set to be longer than the vertical length of the beam, and the upper and lower flanges of the beam Since the notches that can penetrate the upper and lower ends of the gusset plate in the joining process are formed in advance, the upper and lower ends of the gusset plate are cut into the notches when aligning the beam with the planned beam joining position. The beam can be aligned while penetrating the part. Then, after performing the alignment of the beam, after connecting the web of the beam and the gusset plate, the beam flange and the steel pipe column are welded and joined on both front and rear sides of the gusset plate, and the notch and the A weld bead is formed in the gap between the upper and lower ends of the gusset plate by fillet welding or butt welding to fill the gap, and thus the gusset plate and the beam can be integrated. Therefore, according to the method of the present invention, the non-bonded portion that occurs when the conventional method is used, that is, the non-bonded portion where the beam flange and the web (or the gusset plate) are not bonded (for the arrangement of the backing, etc.). It becomes possible to avoid the occurrence of necessary space). As a result, the problem of brittle fracture of the flange caused by the presence of the non-bonded portion does not occur. Further, in the process of joining the beams, the upper and lower end portions of the gusset plate are in a state of penetrating the cutout portions of the upper and lower flanges of the beam. It is not necessary to form a recessed portion for locating the outer peripheral edge portion of the flange of the shorter beam, and thus the problem of increase in the number of material processing steps at the time of joining conventional stepped beams can be solved.

[0008]

As described above, according to the method of the present invention, the problems of brittle fracture of the flange, the increase of man-hours required for processing the material when joining the stepped beams, etc. can be solved all at once. The object of the invention is achieved.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. In the drawings, the portions denoted by the same reference numerals as the conventional example indicate the same or corresponding portions.

[First Embodiment] FIGS. 1 to 10 show a first embodiment of the method of the present invention. In FIG. 1 to FIG. 3, reference numeral 1 denotes a cylindrical steel pipe column, and a beam joining planned portion of the steel pipe column 1 (that is, a place where the beam 2 is planned to be joined to the steel pipe column 1) is a beam 2 For easier insertion work,
The diameter is expanded to form a thick wall. The beam 2 is specifically made of H-shaped steel in which upper and lower flanges 2a and 2b and a web 2d in the middle thereof are integrally connected.

First, a gusset plate 3, which is interposed between the beam 2 and the steel tube column 1 when the beam 2 is to be joined, is vertically attached to a portion of the steel tube column 1 where the beam is to be joined by a welding method. To be The vertical length of the gusset plate 3 is set longer than the vertical length of the beam 2.
Further, the upper and lower flanges 2a and 2b of the beam 2 are preliminarily formed with notches 2K which can penetrate the upper and lower ends of the vertically mounted gusset plate 3 in the joining process.

Next, after horizontally inserting the beam 2 between the adjacent steel pipe columns 1 from a side slightly above the beam-joining planned position, the beam 2 is vertically lowered as shown in FIG. Then, the beam 2 is aligned (especially, the height is aligned). In the alignment, the upper and lower end portions of the gusset plate 3 already attached to the planned beam joining position, the upper and lower flanges 2a, The former is made to penetrate the latter by fitting with the notch 2K of 2b. If the beam positioning member 6 shown in FIG. 2 is attached to the lower part of the gusset plate 3 in advance, the beam positioning member 6 can be used to facilitate the positioning of the beam 2.

In this way, when the alignment work of the beam 2 is completed, the beam 2 is attached to the planned beam joining position.
The high strength bolts 4 are used for bolt connection. In addition, the bolt connection is performed after the connected portion is sandwiched between the two connecting plates 10A and 10B (see FIGS. 2 and 3). After that, the beam flanges 2a and 2b and the steel pipe column 1 are butt welded to each other on both front and rear sides of the gusset plate 3 (5 in FIGS. 1 and 2 is
The gap formed between the cutouts 2K of the beam flanges 2a and 2b and the upper and lower ends of the gusset plate 3 is formed by the welding bead B by a welding method. By burying, the gusset plate 3 and the beam 2 are integrated. As a welding method for filling the gap, a method of forming a weld bead B by simply performing fillet welding on a small gap (see FIG. 4), and mounting a square bar 7 on the gap and welding from above A method of forming the bead B (see FIG. 5), a method of placing the round bar 8 on the gap and forming the weld bead B thereon (see FIG. 6), and inserting a wedge material 9 into the gap Various welding methods such as a method of forming the weld bead B from above (see FIG. 7) and a butt welding can be considered.

In addition, the beam-joining planned portion of the steel pipe column 1 is replaced by the beam 2
In order to increase the diameter for the purpose of facilitating the insertion work, the inner peripheral portion of the steel pipe column 1 may be expanded as shown in FIGS. 8 and 9.

According to the method of the present invention as described above, the beam 2
Prior to attaching the beam to the beam-joining place, the vertical length of the gusset plate 3 previously attached thereto is changed to the beam 2
Since the upper and lower flanges 2a and 2b of the beam 2 are preliminarily formed with notches 2K that can penetrate the upper and lower ends of the gusset plate 3 in the joining process, When performing the alignment work of 2,
The alignment work can be performed while the upper and lower ends of the gusset plate 3 are passed through the notch 2K. Then, after the alignment work is completed, a weld bead B can be formed by fillet welding or butt welding in the gap between the notch 2K and the upper and lower ends of the gusset plate 3 to fill the gap. As a result, the gusset plate 3 and the beam 2 are integrated. Therefore, a non-bonded portion that occurs in the case of the conventional method, that is, a non-bonded portion where the upper flange 2a of the beam 2 and the web 2d (or the gusset plate 3) are not bonded (necessary for the arrangement of the backing, etc.) It becomes possible to avoid the occurrence of (space). As a result, the conventional problem of brittle fracture of the flanges 2a and 2b caused by the presence of the non-bonded portion does not occur.

Next, another embodiment will be described.

[Second Embodiment] In the first embodiment described above, the gusset plate 3 serves as a wall that separates the front and rear, and the beam 2
Since the flanges 2a and 2b of No. 2 are divided into front and rear, when welding the steel pipe column 1 and the flanges 2a and 2b, continuous welding cannot be performed across the front and rear flanges 2a and 2b.
As shown in FIG. 11, a triangular upper cutout 3K is formed at a position corresponding to the upper flange 2a of the gusset plate 3, and a scallop-shaped cutout 3K is formed at a position corresponding to the lower flange 2b of the gusset plate 3. If the scallops 3S are formed, continuous welding can be performed over the front and rear flanges 2a and 2b, and welding workability can be improved.

[Third Embodiment] FIG.
As shown in FIG. 2, when joining a stepped beam (that is, when joining two kinds of beams 2 and 2A having different vertical lengths to the same planned beam joining location in the steel pipe column 1), There are various actions and effects. That is, in the process of joining the beams 2 and 2A,
The upper and lower ends of the gusset plate 3 are the upper and lower flanges 2 of the beam 2.
Since it is in a state of penetrating the notched portion 2K of a and 2b, a recessed portion for fitting the outer peripheral edge portion of the flange of the shorter beam 2A to the intermediate portion in the vertical direction of the gusset plate 3 is formed even when joining the stepped beams. The necessity of forming is eliminated, and thus the problem of increase in the number of material processing steps at the time of joining conventional stepped beams can be solved.

[Fourth Embodiment] The method of the present invention can also be applied to the case where the steel tube column 1 is formed of a rectangular tube as shown in FIG. Further, in the above-described first embodiment, the gusset plate 3 and the web 2d of the beam 2 are bolted to each other after the connected portions are sandwiched by the two joint plates 10. The bolt 3 may be connected to the web 2d of the beam 2 by applying one joint plate 10 from one side as shown in FIG.

It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a front view showing a first embodiment of the method of the present invention.

[Figure 2] Side view

FIG. 3 is a plan view thereof

FIG. 4 is an explanatory view showing a method (part 1) of reinforcing the flange cutout portion.

FIG. 5 is an explanatory view showing a method (part 2) of reinforcing the flange cutout portion.

FIG. 6 is an explanatory view showing a method (part 3) of reinforcing the flange cutout portion.

FIG. 7 is an explanatory view showing a reinforcing method (No. 4) of the flange cutout portion.

FIG. 8 is a vertical cross-sectional view showing a modified example (No. 1) of a beam-joining planned portion of a steel pipe column.

FIG. 9 is a vertical cross-sectional view showing a modified example (No. 2) of a beam-joining planned portion of a steel pipe column.

FIG. 10 is a front view showing a state where a beam is being moved to the beam-joining planned location.

FIG. 11 is a side view showing a second embodiment of the method of the present invention.

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

FIG. 13 is a horizontal sectional view showing a fourth embodiment of the method of the present invention.

FIG. 14 is a front view showing a conventional joining method (No. 1).

FIG. 15 is a front view showing a conventional joining method (No. 2).

[Explanation of symbols]

 1 Steel Pipe Column 2 Beams 2a, 2b Flange 2d Web 2K Notch 3 Gusset Plate B Weld Bead

Claims (1)

[Claims] 1. A gusset plate (3) is attached to a beam joining planned portion of a steel pipe column (1), and both upper and lower flanges (2a), (2b) and a web (2d) are inserted through the gusset plate (3). A method for joining a steel pipe column and a beam, which joins an H-shaped steel beam (2) consisting of a portion to the beam joining planned portion, wherein the vertical length of the gusset plate (3) is set to the beam (2).
Is longer than the vertical length of the gusset plate (3K), the notch (2K) which can penetrate the upper and lower ends of the gusset plate (3) in the joining process is formed in advance in the upper and lower flanges (2a), (2b). The upper and lower ends of the gusset plate (3) attached to the beam-joining planned location are provided with the notch (2K).
The welding bead (2), which is attached to the beam-joining planned position while penetrating the same, and fills a gap formed between the notch (2K) and the upper and lower ends of the gusset plate (3). A method of joining a steel pipe column and a beam, wherein the gusset plate (3) and the beam (2) are integrated by forming B).