JP2000186373A - Connecting member and connecting structure of steel structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connecting method, by which the productivity of steel machining is improved by reducing mandays on operation and the quality of the connecting section of a column member, in which a cross section is changed, and a beam member can also be improved in the connecting section. SOLUTION: An external diaphragm 12 is installed to a lower steel-pipe column 10, and a through-diaphragm 13 is arranged between the lower steel-pipe column 10 and an upper steel-pipe column 11. The external diaphragm 12 is composed of a connecting section 12a surrounding the lower steel-pipe column 10 and three plate sections 12b, the through-diaphragm 13 comprises a thick section 13a, on which the upper steel-pipe column 11 is placed, and three plate sections 13b, and boltholes 12c, 13c for connection are formed to the plate sections 12b, 13b respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for joining a column member and a beam member in a steel structure.

[0002]

2. Description of the Related Art As shown in FIG. 8, a column constituting a steel structure sometimes needs a portion where the cross section changes from a large section column 81 to a small section column 80 as shown in FIG. Conventionally, such a portion is provided at the upper end of the large-section column 81 and the lower end of the small-section column 80 with through diaphragms 86 and 87, respectively.
Are arranged, and a plurality of steel plates 82 are combined and welded to form a tapered portion 83.

[0003] A bracket 84 is joined to the diaphragms 86, 87 and the tapered portion 83 by welding, and a beam member 85 is joined to the tip of the bracket 84 via a bolt / nut 88 and a splice plate 89.

[0004]

In the conventional method,
Since a plurality of steel plates 82 are welded to assemble the tapered portion 83, a lot of man-hours are spent for this work, which is a factor that lowers the productivity and economy of steel frame processing. Further, in the conventional method, since the number of welded portions is relatively large, there is a possibility that the quality of the joined portion is deteriorated.

[0005] Therefore, an object of the present invention is to reduce the number of work steps and improve the productivity of steel frame processing at the joint between the column member where the cross section changes and the beam member. Another object of the present invention is to provide a joining technique capable of improving the quality of a joining portion.

[0006]

According to the present invention, there is provided a connecting member for a steel structure, comprising: a lower steel column having a large cross section; an upper steel column having a smaller cross section than the lower steel column; A joining member used for joining an upper and lower steel pipe column and a beam member, wherein the joining member includes an upper diaphragm and a lower diaphragm, and the lower diaphragm is an outer diaphragm surrounding the lower steel pipe column, The upper diaphragm is a through-diaphragm disposed between an upper end of the lower steel pipe column and a lower end of the upper steel pipe column.

[0007] By joining the upper and lower steel pipe columns and the beam member using the connecting member having such a configuration, the lower steel pipe column and the upper steel pipe column are connected by the upper diaphragm, and the lower diaphragm is attached to the lower steel pipe column. In this state, the lower steel pipe column and the beam member can be joined via the upper and lower diaphragms. Since there is no need to form a tapered portion by combining and welding a plurality of steel plates, or to cut the upper and lower steel pipe columns, the number of work steps is reduced, and the productivity of steel frame processing is improved. In addition, welding defects are reduced due to the reduction in the number of welded portions, so that the quality of the joint is improved. further,
Since the column member and the beam member are not welded to each other, there is no possibility of fracture due to welding defects or brittle fracture.

Here, by forming a through hole communicating with the inside of the lower steel pipe column in the upper diaphragm, the inside of the upper steel pipe column and the inside of the lower steel pipe column communicate with each other. Concrete can be filled, and application to steel pipe concrete structures becomes possible.

Further, the upper diaphragm is formed by a thick portion on which the upper steel pipe column is placed and a plate portion connected to the thick portion and thinner than the thick portion, so that the upper diaphragm is formed through the thick portion. The lower steel pipe column and the upper steel pipe column are firmly joined, and the beam member and the lower steel pipe column can be joined via the plate portion. In addition, since the thick portion intervenes at the boundary between the lower steel column and the upper steel column, the rigidity at the boundary where stress is concentrated increases,
The strength of the joint increases.

[0010] Further, by forming the lower diaphragm from a joint surrounding the lower steel pipe column and a plate connected to the joint, the beam member and the lower steel pipe column are joined via the plate. Therefore, the joining workability is improved, and a strong joint can be formed.

By forming the upper diaphragm and the lower diaphragm with cast steel or forged steel in advance, it is possible to reduce the number of work steps on site. In addition, since the number of welding points due to on-site construction is reduced, the occurrence of poor welding is reduced, and the quality of the joint is improved.

[0012]

FIG. 1 is a perspective view showing a joint structure of a steel pipe column according to a first embodiment of the present invention, FIG. 2 is a plan view of the joint structure of FIG. 1, and FIG. Longitudinal sectional view of the part, FIG.
FIG. 3 is a perspective view showing a joined state of the upper diaphragm in the first embodiment.

In this embodiment, the side pillars 9 of the steel structure are arranged such that the lower steel pipe pillar 10 having a large cross section and the upper steel pipe pillar 1 having a small cross section are provided.
This is the joint structure of the portion narrowed down to 1. Lower steel pipe column 10
The upper steel pipe column 11 and the upper steel pipe column 11 are in a positional relationship such that one of their side surfaces is flush with each other, so that the axis 11c of the upper steel column 11 is shifted from the axis 10c of the lower steel column 10 in the side direction. It is in a state of being left.

An outer diaphragm 12 is mounted on the lower steel column 10, and a diaphragm 13 is disposed between the lower steel column 10 and the upper steel column 11. Outer diaphragm 1
2 is fixed to the outer peripheral surface of the lower steel pipe column 10 by welding,
The through diaphragm 13 is joined to the lower steel column 10 and the upper steel column 11 by welding.

The outer diaphragm 12 includes a joint 12a surrounding the lower steel pipe column 10 and three plate portions 12b connected to the periphery of the joint portion 12, and the plate portion 12b has a beam member 1a.
A plurality of bolt holes 12c to be used for joining with the bolt 7 are formed.

The through-diaphragm 13 is used for the upper steel pipe column 11.
Is composed of a thick portion 13a on which is mounted, and three plate portions 13b connected to the thick portion 13a and having a smaller thickness than the thick portion 13a, and a joining bolt hole 13c is formed in the plate portion 13b. . A vertical reinforcing plate 18 is attached between the plate portion 12b and the plate portion 13b, and a scallop 19 is provided at a corner of the reinforcing plate 18. The through-diaphragm 13 has a through-hole 20 communicating with the inside of the lower steel pipe column 10. The through-hole 20 is formed at a position where the center thereof coincides with the axis 11 c of the upper steel pipe column 11.

With such a configuration, the lower steel pipe column 10 and the beam member 17 can be joined via the plate portion 12b of the outer diaphragm 12 and the plate portion 13b of the through diaphragm 13, so that a strong joining is achieved. A part can be formed. In this case, the auxiliary plate 21 and the bolt / nut 2
2, the plate portions 12b and 13b are connected to the beam member 1.
7 and the reinforcing plate 18 is connected to the beam member 1.
7 with the web 17w.

Unlike the conventional method, it is not necessary to form a tapered portion by combining and welding a plurality of steel plates, or to cut and join the lower steel pipe column 10 and the upper steel pipe column 11, so that the number of working steps is reduced. The productivity of steel processing is improved. In addition, since the number of welding points is reduced, welding defects are reduced, and the quality of the joint is improved.

Since the rigidity is increased by passing the thick portion 13a of the diaphragm 13 through the boundary between the lower steel column 10 and the upper steel column 11, the strength of the joint is large. Further, since the lower steel pipe column 10 and the upper steel pipe column 11 constituting the side columns 9 of the steel structure are not welded to the beam member 17, there is no possibility of breakage due to welding defects or brittle fracture.

The inside of the upper steel pipe column 11 and the lower steel pipe column 1
Since the inside of the lower steel pipe column 10 communicates with the inside of the lower steel pipe column 10 through the inside of the upper steel pipe column 11, concrete can also be filled.

Since the outer diaphragm 12 and the through-diaphragm 13 are made of cast steel in advance, the number of work steps on site is reduced. As a result, the number of welding points due to on-site construction is reduced, so that poor welding is also reduced, leading to an improvement in the quality of the joint.

FIG. 5 is a plan view showing a joint structure of steel pipe columns according to a second embodiment of the present invention, and FIG. 6 is a perspective view showing a joint state of an upper diaphragm in the second embodiment. The present embodiment is a joint structure of a part of a middle pillar 60 of a steel structure which is narrowed from a lower steel pillar 61 having a large cross section to an upper steel pillar 62 having a small cross section. The lower steel pipe column 61 and the upper steel pipe column 62 are in a positional relationship such that their respective axes 61c, 62c coincide with each other.

A diaphragm 63 is arranged between the lower steel pipe 61 and the upper steel pipe 62, and the same outer diaphragm (not shown) as the outer diaphragm 12 is mounted on the lower steel pipe 61. The through-diaphragm 63 is joined to the upper steel pipe column 62 and the lower steel pipe column 61 by welding, respectively, and the outer diaphragm is similarly fixed to the outer peripheral surface of the lower steel pipe column 61 by welding.

The through-diaphragm 63 is connected to the upper steel pipe column 62.
Is composed of a thick portion 63a on which is mounted, and three plate portions 63b connected to the thick portion 63a and thinner than the thick portion 63a. A plurality of joining bolt holes 63c are formed in the plate portion 63b. ing. The through-diaphragm 63 has a lower steel column 6
1 is provided with a through hole 65 communicating with the inside. The through hole 65 is formed at a position where the center thereof coincides with the axis 62 c of the upper steel pipe column 62. The structure and function of the outer diaphragm fixed to the outer peripheral surface of the lower steel pipe column 61 and other parts are the same as those of the outer diaphragm 12 of the first embodiment.
Is the same as

With such a configuration, the lower steel pipe column 61 and the beam member 66 can be firmly joined to each other, and it is not necessary to form a tapered portion unlike the conventional method. Reduce the productivity of steel frame processing,
Since the number of welding points is reduced, welding defects are reduced, so that the quality of the joint is improved.

FIG. 7 is a plan view showing a joint structure of steel pipe columns according to a third embodiment of the present invention. The present embodiment is a joint structure of a portion of a corner post 70 of a steel structure that is narrowed down from a lower section 71 having a large section to an upper section 72 having a small section. The lower steel pipe column 71 and the upper steel pipe column 72 are in a positional relationship such that one of their corners coincides in the plan view, and the axis 72c of the upper steel pipe column 72 is the lower steel pipe column 71c.
In the corner direction from the axis 71c.

A diaphragm 73 is disposed between the lower steel pipe column 71 and the upper steel pipe column 72, and the same outer diaphragm (not shown) as the outer diaphragm 12 is mounted on the lower steel pipe column 71. The through diaphragm 73 is joined to the upper steel column 72 and the lower steel column 71 by welding, and the outer diaphragm is also fixed to the outer peripheral surface of the lower steel column 71 by welding.

The through-diaphragm 73 is provided with an upper steel pipe column 72.
A thick portion 73a on which is mounted, and three plate portions 73b connected to the thick portion 73a and thinner than the thick portion 73a, and a plurality of joining bolt holes 73c are formed in the plate portion 73b. ing. In the through diaphragm 73, the lower steel pipe column 7 is provided.
1 is provided with a through hole 75 communicating with the inside. The through hole 75 is formed at a position where the center thereof coincides with the axis 72 c of the upper steel pipe column 72. The structure and function of the outer diaphragm fixed to the outer peripheral surface of the lower steel pipe column 71 and other parts are the same as those of the outer diaphragm 12 of the first embodiment.
Is the same as

With this configuration, the lower steel pipe column 71 and the beam member 76 can be firmly joined to each other, and it is not necessary to form a tapered portion unlike the conventional method. Reduce the productivity of steel frame processing,
Since the number of welding points is reduced, welding defects are reduced, so that the quality of the joint is improved.

[0030]

According to the present invention, the following effects can be obtained.

(1) By providing a through-diaphragm disposed between a large-section lower steel pipe pillar and a small-section upper steel pipe pillar, and an outer diaphragm surrounding the lower steel pipe pillar, the lower steel pipe is provided through the through-diaphragm. It becomes possible to join the column and the upper steel tube column, and to join the beam member to the lower steel tube column via both diaphragms. Since it is not necessary to form a tapered portion by combining and welding a plurality of steel plates, or to cut and join steel pipe columns, the number of working steps is reduced, and the productivity of steel processing is improved. Since the number of welding spots reduces the number of welding defects, the quality of the joint is improved. Since the column member and the beam member are not welded to each other, there is no possibility of fracture due to welding defects or brittle fracture.

(2) By forming a through hole communicating with the inside of the lower steel pipe column in the upper diaphragm, the inside of the upper steel pipe column communicates with the inside of the lower steel pipe column. Concrete can be filled inside the column, and application to a steel pipe concrete structure is also possible.

(3) The upper diaphragm is formed by a thick portion on which the upper steel pipe column is placed, and a plate portion connected to the thick portion and having a smaller thickness than the thick portion. Thus, the lower steel pipe column and the upper steel pipe column can be firmly joined to each other, and the beam member and the lower steel pipe column can be joined via the plate portion. In addition, since the thick portion intervenes at the boundary between the lower steel pipe column and the upper steel pipe column, the rigidity of the boundary where the stress is concentrated increases, so that the strength of the joint increases.

(4) By forming the lower diaphragm with a joint surrounding the lower steel tube column and a plate connected to the joint, the beam member and the lower steel tube column are joined via the plate portion. Therefore, joining workability is improved, and a strong joining portion can be formed.

(5) By forming the upper and lower diaphragms with cast steel or forged steel in advance, it is possible to reduce the number of work steps on site. In addition, since the number of welding points due to on-site construction is reduced, poor welding is also reduced, and the quality of the joint can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a joint structure of a steel pipe column according to a first embodiment.

FIG. 2 is a plan view of the bonding structure of FIG. 1;

FIG. 3 is a longitudinal sectional view of the joint structure of FIG. 1;

FIG. 4 is a perspective view showing a joined state of an upper diaphragm in the first embodiment.

FIG. 5 is a plan view showing a joint structure of steel pipe columns according to a second embodiment.

FIG. 6 is a perspective view showing a joined state of an upper diaphragm in a second embodiment.

FIG. 7 is a plan view showing a joint structure of steel pipe columns according to a third embodiment.

FIG. 8 is a perspective view showing a main part of a conventional joint structure for steel pipe columns.

[Explanation of symbols]

9 Side pillar 10, 61, 71 Lower steel pipe pillar 11, 62, 72 Upper steel pipe pillar 10c, 11c, 61c, 62c, 71c, 72c Shaft center 12 Outer diaphragm 13, 63, 73 Through diaphragm 12a Joint 12b, 13b, 63b , 73b Plate portion 12c, 13c, 63c, 73c Bolt hole 13a, 63a, 73a Thick portion 17, 66, 76 Beam member 18 Reinforcement plate 19 Scallop 20, 65, 75 Through hole 21 Auxiliary plate 22 Bolt / nut 17f Flange 17w Web 60 center pillar 70 corner pillar

Continued on the front page F term (reference) 2E125 AA04 AA14 AB01 AB16 AC15 AC16 AG12 AG57 BA55 BB02 BB09 BB22 BB35 BC09 BD01 BE01 BF04 BF08 CA05 CA14 EA33

Claims (6)

[Claims] 1. A lower steel column having a large cross section, an upper steel column having a smaller cross section than the lower steel column, and disposed above the lower steel column, and a joint used for connecting the upper and lower steel column and a beam member. A member, wherein the joining member includes an upper diaphragm and a lower diaphragm, wherein the lower diaphragm is an outer diaphragm surrounding the lower steel column, and the upper diaphragm is an upper diaphragm of the lower steel column and an upper diaphragm of the upper steel column. A joining member for a steel structure, wherein the joining member is a through-diaphragm arranged between the lower end and the lower end. 2. The joint member for a steel structure according to claim 1, wherein a through hole communicating with the inside of said lower steel pipe column is formed in said upper diaphragm. 3. The upper diaphragm is formed of a thick portion on which the upper steel pipe column is placed, and a plate portion connected to the thick portion and having a smaller thickness than the thick portion. Item 2. A joining member for a steel structure according to Item 1 or 2. 4. The joining member for a steel structure according to claim 1, wherein said lower diaphragm comprises a joining portion surrounding said lower steel pipe column, and a plate portion connected to said joining portion. 5. The joining member according to claim 1, wherein the upper diaphragm and the lower diaphragm are formed of cast steel or forged steel. 6. A lower steel pipe column having a large cross section and an upper steel pipe column arranged above the lower steel pipe column with a cross section smaller than the lower steel pipe column, using the joining member according to any one of claims 1 to 5. Structure of a steel structure in which a beam and a member are joined.