JP7406764B2 - Joint structure of steel pipe columns - Google Patents

Description

The present invention relates to a joint structure for steel pipe columns.

The main pillars used in general steel-frame buildings are through-columns made of steel pipes such as square steel pipes and round steel pipes. The unit length of these steel pipe columns as a material is usually about three storeys long, considering transportation and the like. Therefore, in the construction of buildings of four or more stories or in sites where long columns cannot be transported, it is necessary to connect steel pipe columns using column joints.

Column joints are generally connected at a height of about 1 m from the beam to reduce the bending stress applied to the column. For closed steel pipe columns such as square steel pipes and round steel pipes, the joints are connected from the outer periphery. Therefore, they are generally joined by on-site welding. However, welding and joining steel pipe columns requires advanced welding skills such as horizontal welding, so it is necessary to secure welders and a secure working environment, which requires a lot of cost and construction time.

In response to such problems, major general contractors are currently promoting robotization of welding operations (for example, Patent Document 1). Although robotizing these welding operations can be effective at large-scale sites, it is often difficult to robotize welding at small- to medium-sized sites. Therefore, it is necessary to adopt a conventionally proposed joint structure using bolts (for example, Patent Document 2).

Japanese Patent Application Publication No. 2018-53626 Japanese Patent Application Publication No. 10-317492

However, the conventional bolt-based joint structure described above is not widely used because it is subject to many restrictions by building regulations to satisfy appropriate strength and is expensive. Furthermore, in these bolt-based joint structures, protrusions of the bolts form on the side surfaces of the joints of the steel pipe columns, which may be undesirable in connection with beams and the like.

The present invention has been made in view of the above circumstances, and allows simple and strong joining using general-purpose bolts without requiring on-site welding work and within the provisions of the Building Standards Act. The object of the present invention is to provide a joint structure for steel pipe columns that has no protrusions from the column surface and can be joined at a cost equal to or lower than that of current bolt connections.

The steel pipe column joining structure of the present invention was made to solve the above technical problem, and is characterized by the following features.

First, the steel pipe column joining structure of the present invention is a steel pipe column joining structure in which ends of steel pipe columns that are vertically opposed in the longitudinal direction are joined to each other,
The steel pipe column includes a connecting member having a constant thickness that projects in the longitudinal direction from at least one end and is welded so as not to protrude from the outer periphery of the steel pipe column,
The connecting member is disposed at a position where the joint surfaces of the respective connecting members are in surface contact when the upper and lower steel pipe columns are opposed linearly in the longitudinal direction, and the joint surfaces are in surface contact. A bolt insertion hole is provided that passes through each.
The upper and lower steel pipe columns are bolted together through the bolt insertion holes of the respective connecting members.
Second, in the steel pipe column joining structure of the first invention, the connecting member is composed of a pair of angle steel members whose cross-sectional shape in a direction perpendicular to the longitudinal direction is bent at a right angle;
The pair of angle iron members are arranged in point-symmetrical positions so that their respective bent portions abut against each other,
Rotating one of the vertically opposed steel pipe columns by 90° in the longitudinal axis direction to fit the angle steel member of the connecting member,
It is preferable that the bolts are joined with the joining surfaces in surface contact.
Thirdly, in the steel pipe column joint structure of the second invention, the pair of angle iron members are joined by a reinforcing member at a lower part of the joint surface, and the tip portions of the upper and lower angle steel members are respectively connected to each other by a reinforcing member. It is preferable that the reinforcing member is joined with the reinforcing member in contact with the reinforcing member.
Fourthly, in the steel pipe column joining structure of the second or third invention, the bent portions of the pair of angle steel members butted against each other may be arranged with an interval of 1 mm or less. preferable.
Fifth, in the steel pipe column joining structure of the first invention, the connecting member is composed of a plurality of plates each having a rectangular notch at a corner of one piece, and the vertical part of the lower part of the notch of the plate is They are arranged side by side,
It is preferable that the connecting members of the vertically opposed steel pipe columns are fitted and bolted together with their joint surfaces in surface contact.
Sixthly, in the joint structure for steel pipe columns according to the fifth invention, the connecting member is composed of the four plates, and the plates are arranged in a cross shape when viewed from above, with the lower vertical sides of the notch portions abutting against each other. It is preferable that the
Seventhly, in the steel pipe column joining structure of the fifth or sixth invention, the vertically opposed steel pipe columns are in a state where the lower horizontal sides of the cutout portions of each plate are in contact with each other. Preferably, they are joined.
Eighthly, in the steel pipe column joining structure of the first to seventh inventions, a slit into which the edge of the connecting member fits is provided in the longitudinal direction of the end side surface of the steel pipe column; It is preferable that the edge of the connecting member is fitted into the slit and welded.
Ninth, in the joint structure of steel pipe columns according to the first to eighth inventions, the steel pipe column is a square steel pipe column, and the joint surface of the connecting member is arranged in a direction perpendicular to the longitudinal direction of the square steel pipe column. It is preferable that the connecting member is disposed at a diagonal position of the cross section, and the edge of the connecting member is welded to the corner of the square steel pipe column.
Tenthly, in the joint structure of steel pipe columns according to the first to eighth inventions, the steel pipe column is a round steel pipe column, and the joint surface of the connecting member is arranged in a direction perpendicular to the longitudinal direction of the square steel tube column. In the cross section, it is preferable that the welding is arranged at a diametrical position passing through the center of the circle.
Eleventhly, in the joining structure of steel pipe columns according to the first to tenth inventions, it is preferable that the shape and arrangement of the connecting members in the upper and lower steel pipe columns to be joined are the same.

According to the joint structure of steel pipe columns of the present invention, there is no need for on-site welding work, it is possible to perform simple and strong joints using general-purpose bolts within the provisions of the Building Standards Act, and the protrusion from the column surface can be easily and strongly connected. There are no bolts, making it possible to join at a cost equal to or lower than that of current bolt connections.

1 is a schematic side view showing a first embodiment of a joint structure for steel pipe columns according to the present invention. FIG. 2 is a sectional view taken along line AA in the joining structure of the first embodiment in FIG. 1; FIG. 2 is a schematic diagram showing a joined state of an angle iron member and a reinforcing member in the joining member of the first embodiment, in which (A) is a side view and (B) is a top view. FIG. 1 is a schematic diagram showing a joining member of a first embodiment, in which (A) is a side view and (B) is a top view. It is a schematic side view which shows 2nd Embodiment of the joining structure of the steel pipe column of this invention. FIG. 6 is a cross-sectional view taken along line BB in the joint structure of the second embodiment of FIG. 5; It is a schematic diagram showing a plate in a joining structure of a 2nd embodiment. It is a schematic diagram showing the joined state of the plates in the joining member of a 2nd embodiment, (A) is a side view, and (B) is a top view. It is a schematic diagram showing a joining member of a 2nd embodiment, (A) is a side view, and (B) is a top view. FIG. 7 is a schematic cross-sectional view of a joint structure according to a third embodiment.

The joint structure of the steel pipe column of the present invention will be described in detail below based on the drawings. FIG. 1 is a schematic side view showing a first embodiment of a joint structure for steel pipe columns according to the present invention, and FIG. 2 is a sectional view taken along line AA in FIG. Further, FIG. 5 is a schematic side view showing a second embodiment of the joint structure for steel pipe columns of the present invention, and FIG. 6 is a sectional view taken along line BB in FIG. Moreover, FIG. 10 is a schematic sectional view showing a third embodiment of the joint structure for steel pipe columns of the present invention.

The steel pipe column joining structure of this embodiment is a steel pipe column joining structure in which the ends of the steel pipe columns 1 that are vertically opposed in the longitudinal direction are joined to each other. The steel pipe column 1 includes a connecting member 2 that projects in the longitudinal direction from at least one end and has a certain thickness and is welded so as not to protrude from the outer periphery of the steel pipe column 1. The connecting member 2 connects the upper and lower steel pipes. Bolts are disposed at positions where the joint surfaces 302 of each connecting member 2 are in surface contact when the pillars 1 are faced linearly in the longitudinal direction, and the bolts pass through each of the joint surfaces 302 with the joint surfaces 302 in surface contact. An insertion hole 40 is provided. The lower steel pipe column 1 is bolted together with bolts 41 and nuts 42 through the bolt insertion holes 40 of each connecting member 2.

Note that the joining structure of the connecting member 2 of the present invention is exemplified by the joining structure of the first embodiment and the joining structure of the second embodiment. In addition, in the following description of the embodiment, a joint structure using the square steel pipe column 1 is shown.

(Joining structure of the connecting member of the first embodiment)
In the joint structure of the first embodiment, the connecting member 21 protruding in the longitudinal direction from one end of the steel pipe column 1 is arranged in a direction perpendicular to the longitudinal direction, as shown in FIGS. 3(B) and 4(B). It is composed of a pair of angle iron members 30 whose cross-sectional shapes are bent at right angles, and these pair of angle iron members 30 are arranged at point-symmetrical positions so that their respective bent portions 301 abut against each other. The thickness of the angle steel member 30 can be appropriately determined according to the standards of the steel pipe column 1, etc., but the selection of dimensions in accordance with the standards specified in JIS G 3192 is considered. Further, a bolt insertion hole 40 is provided in the joint surface 302 of the connecting member 21 .

In the joining structure of the first embodiment, a pair of angle iron members 30 constituting the connecting member 21 are joined to each other by a reinforcing member 31 at the lower part of the joining surface 302. As shown in FIG. 3, the reinforcing member 31 is welded and fixed at a welding portion 311 so as to be in close contact with the lower part of the joint surface 302 of each of the pair of angle iron members 30. Further, it is preferable to use a reinforcing member 31 having the same cross-sectional shape as the angle steel member 30 used for the connecting member 21, and when the upper and lower steel pipe columns 1 are connected, The reinforcing member 31 needs to be formed in such a position and shape that the end thereof comes into contact with the reinforcing member 31 and transmits stress. The angle iron member 30 is made up of two plates integrated into an L-shape, but since it is necessary to transmit stress to the adjacent angle iron members 30, the reinforcing members 31 are welded (drilling welding 311) so as to pass the reinforcing members 31 to each other. Ru. By providing the reinforcing member 31 of the above embodiment, the connecting member 21 can be made to have high strength, and in the joined state, the upper and lower steel pipe columns 1 can be joined with appropriate strength.

To fix the connecting member 21 to the square steel pipe column 1, as shown in FIG. 1 and FIG. A slit 11 is provided, and the edge of the connecting member 21 is fitted into the slit 11 and fixed by welding. Note that the welded portion of the slit 11 is shown by a hatched area. In addition, the position of the slit 11, that is, the arrangement position of the connecting member 21 is such that, as shown in FIGS. It is set to be placed at the position of .

Moreover, it is preferable that at least a part of the reinforcing member 31 is provided in a form that matches the slit of the steel pipe column 1. By bringing the reinforcing member 31, which has the same cross section as the connecting member, into contact with the distal end of the connecting member, the corner slits of the square steel pipe are positioned diagonally symmetrically. Thereby, the reinforcing member 31 and the connecting member 21 are both welded to the corner end of the steel pipe column 1, and the strength of the connecting member 21 can be further increased.

As a joining method of the joining structure of the first embodiment, first, the steel pipe columns 1 having the above-mentioned connecting members 21 having the same shape are vertically opposed to each other, and one of the steel pipe columns 1 is rotated by 90 degrees in the longitudinal axis direction. Then, the joint members 21 are fitted with the joint surfaces 302 of the angle iron members 30 in surface contact. Then, the distal ends of the upper and lower connecting members 2 and the reinforcing members 31 are shifted until they come into contact with each other, and bolted together through the bolt insertion holes 40 that pass through each of them. Note that by using high-strength bolts as the bolts 41 used to join the connecting members 21 together, the upper and lower steel pipe columns 1 can be joined more firmly by friction-welding the joining surfaces 302 of the connecting members 21 to each other.

On the other hand, when fitting the above-mentioned upper and lower connecting members 21, if the bent portions 301 of the pair of angle iron members 30 constituting the connecting member 21 are in contact with each other, the fit of the angle iron members 30 becomes tight, and the joint Workability may be deteriorated. Therefore, it is preferable that the bent portions 301 of the angle-shaped steel members 30 abutted against each other are not brought into contact with each other, but are spaced apart from each other by 1 mm or less, preferably about 0.4 to 1 mm. Thereby, when joining the vertically opposed steel pipe columns 1, it becomes possible to fit the connecting member 2 smoothly without resistance, and it is possible to improve joining workability. Note that if the scale of the joint structure is large, the gap may be wider than 1 mm, but in that case, it is necessary to separately provide a spacer or the like so that the skin gap (gap) is 1 mm or less. This is because the standard specifications for construction work stipulate that the dimensions of the skin plow must be within a predetermined interval.

(Joining structure of connecting member of second embodiment)
As shown in FIGS. 5 to 9, the connecting structure of the connecting member of the second embodiment is such that the connecting member 22 is composed of four plates 32 each having a rectangular notch 321 at one corner. The lower vertical sides 322 of the rectangular notches 321 are arranged in a cross shape when viewed from above and welded together. The thickness of the plate 32 can be determined as appropriate depending on the specifications of the steel pipe column 1, but from the viewpoint of strength, it is usually considered to be about 6 to 40 mm. In addition, in the case of square steel pipes for very high-rise buildings, they may be particularly thick. Further, a bolt insertion hole 40 is provided in the joint surface 302 of the connecting member 22.

The connection member 22 is fixed to the square steel pipe column 1 by fixing the side surface of the corner end of the steel pipe column 1 in advance, as shown in FIGS. A slit 11 having a width that fits the edge of the connecting member 22 is provided in the longitudinal direction, and the edge of the connecting member 22 is fitted into the slit 11 and fixed by welding. Note that the welded portion of the slit 11 is shown by a hatched area. Further, the position of the slit 11, that is, the arrangement position of the connecting member 22 is set such that the joining surface 302 of the plate 32 is arranged at a diagonal position in a cross section perpendicular to the longitudinal direction of the square steel pipe column 1. Ru. That is, the lower vertical sides 322 of the rectangular notches 321 of the four plates 32 constituting the connecting member 22 are welded in a state as shown in FIGS. 8(B) and 9(B) when viewed from above. . In addition, at this time, by providing a space as a welding groove (wedge-shaped notch) 324 in the cross section of the butt part of the plate 32 and welding the welding groove 324, the welding excess interferes with the joint surface 302. The welding surface area can be increased without any problems, and stronger welding can be achieved. In FIG. 8(B) and FIG. 9(B), the welding groove and the welded portion 324 are shown in the shaded area.

As a joining method of the joining structure of the second embodiment, first, the spaces formed by the rectangular notches 321 of the joining members of the vertically opposed steel pipe columns 1 equipped with the above-mentioned connecting members 22 of the same shape are connected to each other. are fitted together to bring the lower horizontal sides 323 of the rectangular notches 321 of each plate 32 into contact with each other. Then, the joint surfaces 302 of the plates 32 are brought into surface contact. In this state, the space formed by the rectangular notch 321 becomes a play in fitting, so unlike the first embodiment, there is no need to leave a gap between the plates 32 due to the design, and the plates 32 fit together without resistance. The position can be adjusted more easily, and the four bonding surfaces 302 can be brought into close contact with each other. Then, in this state, bolts are joined through bolt insertion holes 40 passing through each plate 32. In addition, also in the second embodiment, if the skin clearance is 1 mm or more due to the design, it is necessary to separately provide a spacer. As the bolts 41 used to join the connecting members 22 together, the upper and lower steel pipe columns 1 can be more firmly joined by using high-strength bolts, similarly to the joining structure of the first embodiment. As described above, in the joining structure of the second embodiment, since the lower horizontal sides 323 of the rectangular notch portions 321 of each plate 32 of the steel pipe column 1 are in contact with each other, the upper and lower steel pipe columns The axial force of 1 can be transmitted by the bearing stress of the surface.

(Joining structure of connecting member of third embodiment)
As shown in FIG. 10, the joint structure of the connecting member of the third embodiment is that the steel pipe column is a round steel pipe column 1, and the connecting member 23 has a rectangular notch at the corner of one piece used in the second embodiment. The plate 32 is made up of a plurality of plates 32 having a rectangular notch 321, and the lower vertical sides 322 of the rectangular notch 321 of the plates 32 are arranged and welded together. The third embodiment shown in FIG. 10 has six plates 3, and the lower vertical side 322 of each plate 3 is welded at the center of the circle in the cross section. The round steel pipe column 1 used in the present invention is STK, a general structural carbon steel pipe according to architectural standards, and is generally referred to as a "round pipe", "round steel pipe", or simply "steel pipe".

The connection member 23 is fixed to the round steel pipe column 1 by providing a slit 11 in the longitudinal direction of the end side surface of the round steel pipe column 1 in advance, and having a width that allows the edge of the connection member 23 to fit into the slit 11. The connecting member 23 is fixed by fitting the edge of the connecting member 23 to the connecting member 11 and welding it. The position of the slit 11, that is, the arrangement position of the connecting member 23 is such that the joint surface 302 of the plate 32 passes through the center of the circle and is at an even angle in a cross section perpendicular to the longitudinal direction of the round steel pipe column 1. The joint surfaces 302 are arranged in the same direction (leftward or rightward) with respect to the line segment (center point symmetric) divided by .

As a joining method of the joining structure of the third embodiment, first, the connecting members 23 of the round steel pipe columns 1 having the same shape are formed by the rectangular notches 321 of the connecting members 23 of the vertically opposed round steel pipe columns 1. The spaces are fitted together, and the lower horizontal sides 323 of the rectangular notches 321 of each plate 32 are brought into contact with each other. Then, the six joint surfaces 302 of the plate 32 are brought into surface contact. Then, in this state, bolts are joined through bolt insertion holes 40 passing through each plate 32. As the bolts 41 used for joining the connecting members 23, the upper and lower round steel pipe columns 1 can be more firmly joined by using high-strength bolts, similar to the joining structures of the first and second embodiments. Can be done.

In addition, in any of the joining structures of the first embodiment, the second embodiment, and the third embodiment, the protrusion dimension of the connecting member 2 from the end of the steel pipe column 1 is the same as that of the connecting member 2 of the steel pipe column 1 to be joined. It can be set as appropriate depending on the joint area of , the number of bolt insertion holes 40, etc., and is not particularly limited, but in the case of steel pipe columns of standards used in construction, the protrusion dimension is usually about 10 to 50 cm. is taken into account.

In addition, in any of the joint structures of the first embodiment, the second embodiment, and the third embodiment, the shape and arrangement of the connecting members 2 fixed to the upper and lower steel pipe columns 1 to be connected are the same. preferable. By making the shape and arrangement of the connecting members 2 the same, productivity can be improved and joining can be performed at an accurate position and with appropriate strength. In addition, when the shape and arrangement of the connecting members 2 of the upper and lower steel pipe columns 1 are the same, in order to bring the connecting members 2 into appropriate surface contact with each other, it is necessary that the connecting members 2 are point symmetrical and that the connecting members 2 are point symmetrical. The joint surface 302 of the connecting member 2 must be arranged in the same direction as the line. On the other hand, if the upper and lower connecting members are not the same, this can be achieved by determining and designing line segments that make surface contact.

Although the steel pipe column joint structure of the present invention has been described above based on the embodiments, the present invention is not limited to the above embodiments, and various changes can be made without departing from the gist of the invention. be. For example, in the joint structure of the third embodiment described above, in the joint structure of the round steel pipe column 1, a configuration in which six plates 32 are joined is shown, but it is also possible to have a configuration with three plates or a configuration with more than six plates. can. Further, the connecting member 23 can also be configured using the angle steel member 30 used in the first embodiment for the round steel pipe column 1. Furthermore, in the joint structure of the round steel pipe column 1, when two sets of angle steel members are used for the joint member 23, or when a structure using four plates is used, the round steel pipe column and the square steel pipe column are connected. They can also be joined.

Further, in the above embodiment, the bolts 41 and the nuts 42 are used for frictional joining, but a fastening tool such as a rivet may be used for shearing joining. Moreover, although high-strength bolts are normally used as the bolts 41, ultra-high-strength bolts can be used, and thereby the number of bolts 41 can be reduced. Furthermore, from the viewpoint of increasing the strength of frictional bonding, the joining surface 302 of the connecting member 2 may be subjected to red rust treatment or blasting treatment.

Furthermore, in the joining structures of the first, second and third embodiments, a slit 11 is provided at the end of the steel pipe column 1, and the connecting member 2 is fitted into the slit 11 and welded and fixed. However, a diaphragm may be provided and integrated at the end of the steel pipe column 1, and this diaphragm and the connecting member may be integrated.

According to the steel pipe column joint structure of the present invention having the above configuration, it has a joint strength equal to or higher than that of conventional steel pipe column joints, does not require on-site welding work, and is regulated by the Building Standards Act. It is possible to join with general-purpose high-strength bolts, there are no protrusions from the column surface, the number of parts can be reduced, and strong joints can be made at a cost equal to or lower than the current bolt method.

1 Steel pipe columns (square steel pipe columns, round steel pipe columns)
11 Slit 2 Connecting member 21 Connecting member of the first embodiment 22 Connecting member of the second embodiment 23 Connecting member of the third embodiment 30 Angle steel member 301 Bent part 302 Joint surface 31 Reinforcement member 311 Hole welded part 32 Plate 321 Rectangular notch 322 Lower vertical side of the notch 323 Lower horizontal side of the notch 324 Welding groove and welded part 40 Bolt insertion hole 41 Bolt 42 Nut

Claims (6)

A joint structure of steel pipe columns in which ends of steel pipe columns opposed vertically in the longitudinal direction are joined to each other,
The steel pipe column includes a connecting member having a constant thickness that projects in the longitudinal direction from at least one end and is welded so as not to protrude from the outer periphery of the steel pipe column,
The connecting member is made up of a plurality of plates each having a rectangular notch at one corner thereof, and is arranged so that the lower vertical sides of the rectangular notches of the plates are butted against each other, and the upper and lower steel pipe columns are connected in the longitudinal direction. The joint surfaces of each connecting member are arranged in surface contact when facing each other in a straight line, and each connecting member is orthogonal to the longitudinal direction with the joint surfaces in surface contact. A bolt insertion hole is provided that penetrates in the direction .
A state in which the spaces formed by the rectangular notches of the plates of the vertically opposed connecting members are fitted together, and the lower horizontal sides of the rectangular notches of each plate are in contact with each other. A joint structure of steel pipe columns , wherein the upper and lower steel pipe columns are bolted together through the bolt insertion holes of the respective connecting members whose joint surfaces are in surface contact with each other. 2. The connection member according to claim 1 , wherein the connecting member is made up of four plates, and the plates are arranged in a cross shape when viewed from above, with vertical sides of the lower portions of the rectangular notches facing each other. Joint structure of steel pipe columns. A slit into which the edge of the connecting member fits is provided in the longitudinal direction of the end side of the steel pipe column, and the edge of the connecting member is fitted into the slit and welded. The joint structure of steel pipe columns according to claim 1 or 2 . The steel pipe column is a square steel pipe column, the joint surface of the connection member is arranged at a diagonal of a cross section perpendicular to the longitudinal direction of the square steel pipe column, and the edge of the connection member is in the square shape. The joint structure for a steel pipe column according to any one of claims 1 to 3, wherein the joint structure is welded to a corner of the steel pipe column. The steel pipe column is a round steel pipe column, and the joint surface of the connecting member is arranged and welded at a diametrical position passing through the center of a circle in a cross section perpendicular to the longitudinal direction of the round steel pipe column. The joint structure for steel pipe columns according to any one of claims 1 to 4, characterized in that: The joining structure of steel pipe columns according to any one of claims 1 to 5, wherein the shape and arrangement of the connecting members in the upper and lower steel pipe columns to be joined are the same .

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