JP2020037775A - Non-brace steel frame building construction method and column base unit - Google Patents

Abstract

To provide a non-brace steel frame building, its construction method and a column base unit, capable of eliminating the need of a brace, improving the fitting of a column joint part, and eliminating the need of field welding, while improving factory productivity and transportability by a vertical split structure of a column.SOLUTION: A non-brace steel frame building is constituted of a column 1 made of a square pipe and a beam 2 made of steel. The column 1 is composed of a lower column 1a and an upper column 1b joined to each other in the middle of the story height. In the upper column 1b, a joining steel frame 1bb having a non-closed cross-sectional shape inserted into the lower column 1a extends downward from an upper column body 1ba made of a square pipe. Grout is filled in a state where the joining steel frame 1bb of the upper column 1b is buried in the lower column 1a, and a column joint part 9 between the lower column 1a and the upper column 1b is rigidly joined. A beam end component member 2b of the beam 2 is welded to the side surfaces at least two directions of the lower end of the lower column 1a.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a non-braced steel frame building such as a lightweight steel frame prefabricated building such as an office building, a commercial facility building, an industrial facility building, a warehouse, and a house, a method of constructing the same, and a column base unit.

  In the prefabricated building, a lightweight steel square pipe column is often used. The joint between the column and the beam is a pin joint and reinforced with braces. However, when the brace is provided, the degree of freedom of the plan and the restrictions on the design increase, for example, the window opening cannot be formed.

JP-A-11-50539 JP-A-8-311991 JP-A-9-317003 JP-A-2002-242303 JP-A-6-26098 JP-A-2006-159296 JP-A-5-39632 JP 2002-129658 A

If the column / beam joint is made rigid by welding or the like, the brace can be eliminated. However, in order to increase the factory production rate or reduce the transport size, it is necessary to divide the columns vertically in the middle of the floor height and join them with column joints. For example, a column base unit obtained by welding a divided lower column and a short beam forming an end of a beam in each direction is factory-produced and transported to a site. According to this, the factory production rate can be increased and the transport size can be reduced.
However, when a column joint is used, even if the column / beam joint is rigidly joined, the rigidity of the building is insufficient if the column joint is not rigidly joined, and reinforcement by braces is required.
There is a configuration in which the column joints are rigidly joined, in which square pipe columns are joined with high-strength bolts.However, in order to join with high-strength bolts, it is necessary to overlap a reinforcing plate, and a reinforcing plate or The head of the high-strength bolt, etc., protrudes, making it difficult to fit.
Rigid joining can be achieved by welding, but field welding cannot be adopted because of uncertain factors and lack of joint reliability.

Various proposals have been made for a joint structure of a steel pipe column (for example, Patent Documents 1 to 8). For example, a proposal is also proposed in which concrete is filled in the entire steel pipe column with a reinforcing bar interposed in the connection part (Patent Document 1), and a method in which a connecting column is inserted into the connection part and grout is filled (Patent Document 2). Have been.
However, Patent Literature 1 is a steel pipe column in which concrete is filled in the entire steel pipe column, and the amount of concrete used is large, and the work of arranging a reinforcing bar at a joint takes time.
Patent Document 2 discloses a configuration in which a short steel pipe joint member provided on an upper column is inserted into a lower column and grout is filled between the outer periphery of the joint member and the lower column, but the joint member has a closed cross section. The interior is left as a space. For this reason, the filling amount of the grout is small, and there is a concern about cracking of the grout layer, and it is difficult to increase the rigidity of the joint portion.
The other Patent Documents 3 to 8 have problems such as that the joining work takes time, or a protruding portion is formed from the pillar surface, and the fitting is poor.

  SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to eliminate the need for braces, improve the fitting of column joints, and improve on-site welding while improving factory productivity and transportability by means of a vertical split structure of columns. It is an object of the present invention to provide a non-braced steel frame building capable of eliminating the need for a steel frame, a construction method thereof, and a column base unit.

The non-braced steel frame building of the present invention is a non-braced steel frame building composed of square pipe columns and steel frame beams,
The pillar is composed of a lower pillar and an upper pillar which are joined to each other in the middle of the floor height, and the upper pillar has a joining steel frame having a non-closed cross-sectional shape inserted into the lower pillar, made of a square pipe. It is provided extending downward from the upper column main body, the lower column is filled with grout in a state in which the joining steel frame is embedded, and the column joint portion between the lower column and the upper column is rigidly joined. Then, the end surfaces of the beam end constituting materials that are part of the beam in the length direction in each direction are welded to at least two side surfaces of the lower end of the lower pillar.

According to this configuration, the square pipe column is divided into the lower column and the upper column, the joining steel frame provided in the upper column is inserted into the lower column, and the lower column is filled with grout. Therefore, the column joint is rigidly joined, and can bear the horizontal force. Since the column joint is rigidly joined and the lower end of the lower column and the beam are joined by welding to form a rigid joint, the brace can be omitted. By omitting the brace, the degree of freedom of the plan and the design (design) are improved, for example, the window opening can be freely taken. The column joints are rigidly joined, but since the joining steel frame is inserted and grout is filled, on-site welding is unnecessary, and unlike the case of joining with high-strength bolts, there are parts that protrude outside the column. It does not occur and fits well. Since the joining steel frame has a non-closed cross-sectional shape, a large filling amount of the grout layer can be obtained, and the strength and rigidity of the grout portion are excellent.
Further, since the pillar is divided into a lower pillar and an upper pillar, and the beam to be joined to the lower pillar is only a portion of the beam end component material, the transport size can be reduced and the transportability is excellent. For this reason, the lower column and the beam end component can be joined by factory welding, and this joint does not require on-site welding, and the joining reliability is improved.

In the non-brace steel frame building of the present invention, among the columns and beams constituting the building, the beams and columns other than the floor beam on the lowest floor may be lightweight steel frames.
Because the lower column is connected to the upper column by inserting the connecting steel frame into the lower column and filled with grout to form a rigid connection, the column can be rigidly connected even if the column is a lightweight steel frame square pipe. While using an inexpensive steel-framed building, it is possible to improve the above-described factory productivity and transportability, eliminate the need for braces, improve the accommodation of column joints, and eliminate the need for on-site welding.
The floor beam on the lowest floor may be either a light steel frame or a heavy steel frame. Even in the case of a lightweight steel frame building, the floor beam on the lowest floor may also serve as a base, and is often made of a heavy steel frame. Is obtained.

The joining steel frame may be a cross-shaped cross section, for example, a cross plate.
The joining steel frame may have various cross-sectional shapes, but if the cross-sectional shape is a cross shape, horizontal force in each direction can be transmitted between the upper column and the lower column, and filling of grout is hindered. It is difficult to grind and has excellent grout filling properties.

The column vertical beam type column / beam joint of the present invention is a column / beam joint composed of a column and a beam made of a lightweight steel square pipe,
A lower pillar and an upper pillar joined to each other in the middle of the floor height of the steel frame building, wherein the upper pillar is formed of a square pipe made of a joining steel frame having a non-closed cross-sectional shape inserted into the lower pillar. The lower column and the upper column are rigidly joined by being provided to extend downward from the upper column main body and filling the lower column with grout in a state in which the joining steel frame is embedded, At least two side surfaces of the lower end of the lower column are welded with end surfaces of beam end components that become a part of the beam length direction in each direction, and the lower column and the beam end configuration are welded. The column base unit is composed of the materials.

  By using the column / beam joint having this configuration, as described for the non-braced steel frame building of the present invention, the brace is unnecessary and the column is improved while improving the factory productivity and the transportability by the vertical split structure of the column. It is possible to improve the fitting of the joint and eliminate the need for on-site welding.

The method of constructing a non-braced steel frame building of the present invention is a method of constructing a non-braced steel frame building composed of square pipe columns and steel frame beams,
The lower pillar of the lower pillar and the upper pillar which are joined to each other in the middle of the floor height of the pillar, and the length direction of the beam in each direction on at least two side surfaces of the lower end of the lower pillar. A process of factory-manufacturing a column base unit in which the end faces of the beam end components constituting a part of the welding are welded,
A process of factory-producing an upper column extending downward from an upper column main body made of a square pipe, with a joining steel frame having a non-closed cross-sectional shape inserted into the lower column,
A step of inserting the joining steel frame of the upper column into the lower column of the column base unit carried into the building site,
Filling the lower pillars with grout in a state in which the joining steel frame is embedded, and curing.
And

  According to the method of constructing a non-braced steel frame building, as described for the non-braced steel frame building according to the present invention, the brace is not required while improving the factory productivity and the transportability by the vertically divided structure of the columns. It is possible to improve the fitting of the joint and eliminate the need for on-site welding.

  The non-braced steel frame building of the present invention is a non-braced steel frame building composed of square pipe columns and steel frame beams, wherein the columns are joined to each other in the middle of the floor height. And an upper column, wherein the upper column is provided with a joining steel frame having a non-closed cross-sectional shape inserted into the lower column, extending downward from an upper column main body made of a square pipe, and The grout is filled in a state in which the joining steel frame is embedded, and the column joint portion between the lower column and the upper column is rigidly joined, and at least two side surfaces of the lower end of the lower column are provided. Since the end faces of the beam end components, which become part of the beam length direction in each direction, are welded, the need for braces is eliminated while improving factory productivity and transportability due to the vertical split structure of the columns. In addition, the fitting of the column joint can be improved, and the need for on-site welding can be eliminated.

  A column-beam split type column / beam joint according to the present invention is a column / beam joint comprising a column and a beam made of a lightweight steel square pipe, and is joined to each other in the middle of the floor height of a steel frame building. A lower pillar and an upper pillar, wherein the upper pillar is provided with a joining steel frame having a non-closed cross-sectional shape inserted into the lower pillar, extending downward from an upper pillar body made of a square pipe. The lower column is filled with grout in a state in which the joining steel frame is embedded, so that the lower column and the upper column are rigidly joined, and at least two directions of the lower end of the lower column. To form a column base unit with the lower column and the beam end component, the end surfaces of the beam end components that become a part of the beam length direction in each direction are welded to the side surfaces, Eliminating the need for braces and delivering column joints while improving factory productivity and Rino improvement, is not required of the field welding can be achieved.

  The method of constructing a non-braced steel framed building of the present invention is a method of constructing a non-braced steel framed building composed of a square pipe column and a steel frame beam. A lower pillar of the lower pillar and the upper pillar which are joined to each other, and a beam end portion which is a part of the length direction of the beam in each direction on at least two side surfaces of the lower end of the lower pillar. A process of factory-producing a column base unit with end faces of constituent materials welded thereto, and an upper column in which a joining steel frame having a non-closed cross-sectional shape inserted into the lower column extends downward from an upper column main body made of a square pipe. A factory production process, a step of inserting the joining steel frame of the upper column into the lower column of the column base unit carried into the building site, and a step of embedding the joining steel frame into the lower side. Filling the columns with grout and curing. Therefore, plant productivity due to the upper and lower divided structure of the column, while improving transportability, unnecessary reduction of the brace, the improvement of fit pillar joint, unnecessary reduction of field welding attained.

It is an exploded perspective view showing an example of a column up-and-down division type column / beam joint in a non-brace steel frame building concerning one embodiment of the present invention. It is a perspective view of the assembled state of the same column vertical division | segmentation type column / beam joint body. It is a top view which shows the arrangement | positioning of the beam of the non-brace steel frame building. FIG. 2 is a front view of an intermediate omitted state of the building and a side view of some pillars thereof. It is a fragmentary rear view of the column base unit of the same building. It is a top view of the column base unit. It is a fragmentary front view of the non-brace steel frame building concerning other embodiments of this invention. It is the fragmentary front view of the non-brace steel frame building concerning another embodiment of this invention, and its disassembled front view.

A first embodiment of the present invention will be described with reference to FIGS.
This non-braced steel frame building is a lightweight steel frame prefabricated building that becomes an office building, a commercial facility building, an industrial facility building, a warehouse, a house, and the like. . In this steel frame building, a frame is composed of a pillar 1 made of a square pipe and a steel beam 2 serving as a floor beam, and a column-beam split type column / beam joint body 3 having the following configuration is provided in at least one place. Have. FIGS. 1 and 2 show two column-vertical split type column / beam joints 3 at a position, FIG. 1 shows a state in the middle of assembly (disassembled state), and FIG.

In this column-vertical split type column / beam joint 3, the column 1 is divided into a lower column 1a and an upper column 1b in the middle of the floor height, and the lower column 1a and the upper column 1b are grouted 4 (FIG. 4). Are joined by a rigid joint column joint portion 9 filled with a halftone dot (a part shown by a halftone dot), so to say, a column having a hybrid structure. The lower pillar 1a may have a length of only a portion serving as a pillar. The lower end surface of the lower column 1a is closed by a column base plate 22 joined to the lower column 1a by welding all around. The grout 4 is made of mortar such as non-shrink mortar or concrete.
In the lower pillar 2a, a beam end component 2a, which is a part of the beam 2 to be a floor beam, is joined to two adjacent side surfaces at the lower end, and the lower pillar 1a and the beam end component 2b are used as pillar bases. The unit 5 is configured. The column base unit 5 is produced in a factory and is carried into a construction site.

  The square pipe to be the column 1 is a lightweight steel frame (having a thickness of 6 mm or less), for example, having a thickness of about 100 mm square. The beam 2 serving as a floor beam is made of channel steel or the like, and may be either a heavy steel frame or a light steel frame. In this example, the outer dimension (beam height) is 200 mm, the width is 80 mm, and the web thickness is It is a heavy steel channel steel of 7.5 mm and a flange thickness of 11 mm.

  The upper pillar 1b is composed of an upper pillar main body 1ba made of the square pipe and a joining steel frame 1bb joined to a lower end of the upper pillar main body 1ba. The joining steel frame 1bb is a member to be inserted into the lower column 1a, and a cross plate or a shaped steel having a cross-shaped cross section is used. The length of the joining steel frame 1bb is, for example, a length inserted over the entire height of the lower column 1a. The lower end surface of the upper column main body 1ba is closed by a small plate 6 made of a steel plate joined by full circumference welding or the like, and the upper end of the joining steel frame 1bb is joined to the small plate 6 by welding or the like. The upper column 1b composed of the upper column main body 1ba, the fore-edge plate 6, and the joining steel frame 1bb is produced at a factory.

The beam end component 2b constituting the column base unit 5 is a member of an end part obtained by dividing the beam 2 made of the channel steel to be a floor beam into three parts, and the intermediate member obtained by dividing the three parts is a beam intermediate part. It becomes the component 2a. The beam end component 2b and the beam intermediate component 2a are joined by bolts and nuts 21 via a joining plate 8 superposed on the web surface.
Studs 12 (only the column bases are shown in FIGS. 1 and 2) are installed on the beam intermediate component 2a, and a stiffening plate 13 is provided at the position where the studs 12 are installed.

  FIG. 3 is a plan view of a column and a beam showing an example of an entire non-braced steel frame building provided with the column vertical beam type column / beam joint body 3. In this building, one module has a module configuration of 900 mm, and column / column split type column / beam joints 3 are used at the four corners of the building, at multiple locations along the outer wall, and inside the building.

  As shown in FIGS. 4 to 6, a beam 2 </ b> A of a ceiling portion serving as a shed beam in a girder direction and a wife direction is joined to two adjacent side surfaces at the upper end of the upper pillar 1 b by pin joining. These beams 2A are channel steel, and the webs of the beams 2A are superimposed on a joining plate 24 joined to each side surface of the upper column 1b by welding or the like, and are joined by bolts and nuts 25. For the beam 2A in the girder direction, for example, a lightweight section steel having a height of 150 mm, a width of 75 mm, and a web and flange thickness of 4.5 mm is used. For the beam 2A in the wife direction, for example, a lightweight section steel having a height of 250 mm, a width of 125 mm, a web thickness of 3.2 mm, and a flange thickness of 4.5 mm is used. The upper end surface of the upper pillar 1b is closed by a top plate 26. In FIG. 4, GL indicates a design ground level, L1 indicates a floor top surface, and L2 indicates a ceiling finish surface.

The construction process will be described.
Of the columns 1, the lower column 1a is factory-produced in the state of the column base unit 5 and transported to a construction site. The column base unit 5 is arranged at a predetermined position in the building site, the beam end component 2b of each column base unit 5 is joined to the intermediate beam component 2a, and the plurality of column base units 5 are connected to each other via the beam 2. Connected to. In this example, the column base unit 5 is installed on a foundation 20 made of a solid foundation.
When the column base unit 5 is installed at a predetermined position in the building site in this way, the joining steel frame 1bb of the factory-produced upper column 1b is inserted into the lower column 1a of the column base unit 5 (FIGS. 1 and 4). Arrow a).
When the joining steel frame 1bb is inserted until the lower surface of the upper column main body 1ba of the upper column 1b (the lower surface of the edge plate 6) contacts the upper end surface of the lower column 1a, grout filling formed on the upper portion of the lower column 1a is performed. The grout 4 is poured from the hole 10. When the grout 4 hardens, the lower pillar 1a and the upper pillar 1b are integrated. The curing is performed, for example, by curing for about three days.

According to the column-vertical split type column / beam joint 3 and the steel-frame building having this configuration, the column 1 made of a square pipe is divided into the lower column 1a and the upper column 1b, and the connecting steel frame provided on the upper column 1b. 1bb is inserted into lower pillar 1a, and grout 4 is filled in lower pillar 1b. Therefore, the column joint portion 9 is rigidly joined.
As described above, the column joint portion 9 is rigidly connected, and the lower end of the lower column 1a and the beam 2 serving as the floor beam are connected by welding and are rigidly connected. , And the brace can be eliminated from the conventional lightweight steel structure (brace structure) while the building is made of a lightweight steel frame. By omitting the brace, the degree of freedom of the plan and the design (design) are improved, for example, the window opening can be freely taken.

Since the grout 4 is filled in the lower column 1a constituting the column base, local buckling hardly occurs in the column 1 which is a lightweight square pipe column, and the reduction in proof stress due to the divided structure is alleviated. Therefore, the inner diaphragm for stiffening at the joint of the beams 2 serving as floor beams can be omitted.
Since the buckling of the column 1, which is a lightweight square pipe column, is restrained by the filling grout 4, the deformability of the column 1 is also improved as compared with a pure steel frame.
The joining steel frame 1bb bears bending, shear, and axial force. In this embodiment, the joining steel frame 1bb is inserted through substantially the entire lower column 1a, and the grout 4 is also substantially the same as the lower column 1a. Since the entirety is filled, the rigidity of the lower column 1a is further increased.

Although the column joint portion 9 is rigidly joined, since the joining steel frame 1bb is inserted and the grout 4 is filled, no on-site welding is required, and unlike the case of joining with a high-strength bolt, the column joint portion 9 is provided outside the column 1. There is no protruding part, so it fits well.
Since the joining steel frame 1bb has a non-closed cross-sectional shape, and in particular, is a cross plate, there is no space in the joining steel frame 1bb, and the filling amount of the grout 4 layer in the column cross section increases, and the portion of the grout 4 Excellent strength and rigidity.

  Further, since the column 1 is divided into a lower column 1a and an upper column 1b, and the beam 2 joined to the lower column 1b is only the beam end component 2b, the transport size can be reduced and the transportability can be reduced. Also excellent. For this reason, the lower column 1a and the beam end component 2b can be joined by factory welding, and this joint does not require on-site welding, which increases the reliability of joining and increases the factory production rate in the prefabrication. Can be.

  FIG. 7 shows another embodiment of the present invention. This embodiment shows an example applied to a multi-story (specifically, two-story) steel frame building. This embodiment is the same as the first embodiment shown in FIGS. 1 to 6 except for matters to be particularly described. In this embodiment, the column-column split type column / beam joint 3 described in the first embodiment is attached to the column 1 on the first floor and the beam 2 on the floor, and the column 1 on the second floor and the beam 2 on the floor. Have been applied.

  The beam on the ceiling directly connected to the upper end of the column 1 on the first floor is omitted, and the beam 2 serving as the floor beam on the second floor also serves as the beam on the ceiling on the first floor. The upper end of the pillar 1 on the first floor portion is joined to the lower end of the pillar 1 on the second floor portion via a plate 27 in an abutting state. The same applies to an upper floor portion and a lower floor portion, for example, between a second floor portion and a third floor portion in a case where the building has three or more floors.

  The connection between the upper end of the column 1 on the top floor, in this example, the column 1 on the second floor and the beam 2B on the ceiling is the same as the connection between the column 1 and the beam 2A in the first embodiment.

The joining between the columns 1 and 1 on the upper and lower floors is, for example, joining by welding at a factory.
FIG. 8 shows a specific example of a non-braced steel frame building which is a multi-story structure of three stories or more.
In the case of a two-story building, it is composed of a lowest floor unit 31, an intermediate floor unit 32, and a top floor unit 33. The lowest floor unit 31 is constituted solely by the column base unit 5. The middle floor unit 32 includes an upper pillar 1b of a lower floor portion (a first floor portion of a two-story building) at a lower end of the lower pillar 1a of the pillar base unit 5 of an upper floor portion (a two-story portion of a two-story building). Assume that they were joined by welding at the factory. The top floor unit 33 joins the beam end component 2Ba of the beam 2B of the ceiling, which is a hut beam in the girder direction and the wife direction, to the upper pillar 1b of the top floor part (the second floor part in the case of a two-story building). It becomes.
For each of the floor units 31 to 33 configured as described above, the work of inserting the joining steel frame 1bb of the upper pillar 1b of the upper floor unit into the lower pillar 1a of the lower floor unit and filling the grout 4 is sequentially performed. The grout 4 may be filled after the units 31 to 33 on all floors have been inserted into each other.
In the case of a building having three or more floors, a plurality of units 31 to 33 are provided.

  As described above, in the case where the present invention is applied to a building having two or more floors, the brace is not required and the column joint 9 can be accommodated while improving the factory productivity and the transportability by the vertically divided structure of the column 1 as described above. Improvement and eliminates the need for on-site welding.

  The embodiments for carrying out the present invention have been described based on the embodiments. However, the embodiments disclosed herein are illustrative in all aspects and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

DESCRIPTION OF SYMBOLS 1 ... pillar 1a ... lower pillar 1b ... upper pillar 1ba ... upper pillar main body 1bb ... joining steel frame 2 ... beam 2a ... beam end component 2b ... beam intermediate component 2A, 2B ... ceiling beam 3 ... column vertical Split column / beam joint 4 Grout 5 Column base unit 9 Column joint

The non-braced steel frame building of the present invention is a non-braced steel frame building composed of square pipe columns and steel frame beams,
The pillar is composed of a lower pillar and an upper pillar which are joined to each other in the middle of the floor height, and the upper pillar has a joining steel frame having a non-closed cross-sectional shape inserted into the lower pillar, made of a square pipe. It is provided extending downward from the upper column main body, the lower column is filled with grout in a state in which the joining steel frame is embedded, and the column joint portion between the lower column and the upper column is rigidly joined. Then, the end surfaces of the beam end constituting materials that are part of the beam in the length direction in each direction are welded to at least two side surfaces of the lower end of the lower pillar.
The joining steel frame of the upper column is inserted over the entire height of the lower column, the grout is filled entirely from the upper end to the lower end of the lower column, and the upper column has a grout. It is unfilled, and the lower end surface of the upper column main body is closed by a small plate joined by full circumference welding, and the upper end of the joining steel frame is welded to this small plate.

The column vertical beam type column / beam joint of the present invention is a column / beam joint composed of a column and a beam made of a lightweight steel square pipe,
A lower pillar and an upper pillar joined to each other in the middle of the floor height of the steel frame building, wherein the upper pillar is formed of a square pipe made of a joining steel frame having a non-closed cross-sectional shape inserted into the lower pillar. The lower column and the upper column are rigidly joined by being provided to extend downward from the upper column main body and filling the lower column with grout in a state in which the joining steel frame is embedded, At least two side surfaces of the lower end of the lower column are welded with end surfaces of beam end components that become a part of the beam length direction in each direction, and the lower column and the beam end configuration are welded. The column base unit is composed of the materials.
The joining steel frame of the upper column is inserted over the entire height of the lower column, the grout is filled entirely from the upper end to the lower end of the lower column, and the upper column has a grout. It is unfilled, and the lower end surface of the upper column main body is closed by a small plate joined by full circumference welding, and the upper end of the joining steel frame is welded to this small plate.

The method of constructing a non-braced steel frame building of the present invention is a method of constructing a non-braced steel frame building composed of square pipe columns and steel frame beams,
The lower pillar of the lower pillar and the upper pillar which are joined to each other in the middle of the floor height of the pillar, and the length direction of the beam in each direction on at least two side surfaces of the lower end of the lower pillar. A process of factory-manufacturing a column base unit in which the end faces of the beam end components constituting a part of the welding are welded,
A process of factory-producing an upper column extending downward from an upper column main body made of a square pipe, with a joining steel frame having a non-closed cross-sectional shape inserted into the lower column,
A step of inserting the joining steel frame of the upper column into the lower column of the column base unit carried into the building site,
Filling the lower pillars with grout in a state in which the joining steel frame is embedded, and curing.
And
The joining steel frame of the upper column is inserted over the entire height of the lower column, the grout fills the entire lower column from the upper end to the lower end, and the upper column is non-grouted. The lower end face of the upper column main body in the column base unit is closed by a small plate joined by full circumference welding, and the upper end of the joining steel frame is welded to this small plate.

The upper pillar 1b is composed of an upper pillar main body 1ba made of the square pipe and a joining steel frame 1bb joined to a lower end of the upper pillar main body 1ba. The joining steel frame 1bb is a member to be inserted into the lower column 1a, and a cross plate or a shaped steel having a cross-shaped cross section is used. The length of the joining steel frame 1bb is a length that is inserted over the entire height of the lower column 1a. The lower end surface of the upper column body 1ba is closed by small plates 6 made of joined steel plates in all Shu溶contact, the upper end of the joining steel 1bb is joined by welding or the like to the small plate 6. The upper column 1b composed of the upper column main body 1ba, the fore-edge plate 6, and the joining steel frame 1bb is produced at a factory.

Claims (5)

It is a non-braced steel framed building composed of square pipe columns and steel beams,
The pillar is composed of a lower pillar and an upper pillar which are joined to each other in the middle of the floor height, and the upper pillar has a joining steel frame having a non-closed cross-sectional shape inserted into the lower pillar, made of a square pipe. It is provided extending downward from the upper column main body, the lower column is filled with grout in a state in which the joining steel frame is embedded, and the column joint portion between the lower column and the upper column is rigidly joined. A non-braced steel frame building in which a beam end portion constituting a part of a longitudinal direction of the beam in each direction is welded to at least two side surfaces of a lower end of the lower pillar.   The non-braced steel framed building according to claim 1, wherein, of the columns and beams constituting the building, beams and columns other than a floor beam on the lowest floor are lightweight steel frames.   The non-braced steel frame building according to claim 1 or 2, wherein the connecting steel frame has a cross-shaped cross section. It is a column-beam split type column / beam joint composed of a light steel square pipe column and a part of a beam,
A lower pillar and an upper pillar joined to each other in the middle of the floor height of the steel frame building, wherein the upper pillar is formed of a square pipe made of a joining steel frame having a non-closed cross-sectional shape inserted into the lower pillar. The lower column and the upper column are rigidly joined by being provided to extend downward from the upper column main body and filling the lower column with grout in a state in which the joining steel frame is embedded, At least two side surfaces of the lower end of the lower column are welded with end surfaces of beam end components that become a part of the beam length direction in each direction, and the lower column and the beam end configuration are welded. A column-beam split-type joint that forms a column base unit with materials. A method of constructing a non-braced steel-framed building composed of square pipe columns and steel beams,
The lower pillar of the lower pillar and the upper pillar which are joined to each other in the middle of the floor height of the pillar, and the length direction of the beam in each direction on at least two side surfaces of the lower end of the lower pillar. A process of factory-manufacturing a column base unit in which the end faces of the beam end components constituting a part of the welding are welded,
A process of factory-producing an upper column extending downward from an upper column main body made of a square pipe, with a joining steel frame having a non-closed cross-sectional shape inserted into the lower column,
A step of inserting the joining steel frame of the upper column into the lower column of the column base unit carried into the construction site,
Filling the lower pillars with grout in a state in which the joining steel frame is embedded, and curing.
And construction method of non-brace steel frame building including.

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