JP2020143430A - Joint structure of square steel pipe column - Google Patents

Abstract

To form a square steel pipe column by axially butting an upper column member and a lower column member separated from each other and joining them without depending on welding, and to prevent loss of compressive force due to contact between corner members while generating compressive force acting on a corner member arranged inside an outer ring most effectively on the column.SOLUTION: Recessed grooves 22, 32 are formed in the circumferential direction at least in corner parts 21, 31 at positions spaced apart from the abutment surfaces 2a, 3a of an upper column member 2 and a lower column member 3, respectively; a corner members 4 in contact with the outer peripheral surfaces of the upper column member 2 and the lower column member 3 are arranged at the respective corner parts 21, 31 of the upper column member 2 and the lower column member 3 which are butted against each other, while axially straddling both recessed grooves 22, 32 of the upper column member 2 and the lower column member 3; an outer ring 5 continued in the circumferential direction of the upper column member 2 and the lower column member 3 and capable of bearing tensile force is arranged on the outer peripheral side of all the corner members 4.SELECTED DRAWING: Figure 1

Description

The present invention relates to a joint structure of a square steel pipe column in which an upper column member and a lower column member separated from each other are abutted in the axial direction and joined without depending on welding to form a square steel pipe column.

It is common that the upper column member and the lower column member, which are butted in the axial direction and joined to form a steel pipe column (column member), are brought into the site in a separated state and then welded and joined at the site. is there. In order to reduce the construction error during welding of the upper and lower column members in the butted state, it is necessary to straddle a plate between the steel materials previously welded to the outer periphery of each column member for positioning (patented). Reference 1).

As a method of joining columnar members that are abutted against each other without welding, an inner ring and an outer ring are straddled between the ends of a cylindrical pile member (columnar member) and attached to the inner peripheral surface of the outer ring. There is a method of joining both pile members by applying a force from the outer ring to the inner ring toward the center side with the arrangement of the outer ring by utilizing the inclination (see Patent Document 2).

This method focuses on the fact that the outer peripheral surface of the columnar member has a cylindrical shape, and by inclining the outer peripheral surface of the inner ring and the inner peripheral surface of the outer ring with respect to the axis of the columnar member (the surface of the columnar member), a wedge is used. Utilizing the effect, a force toward the center of the columnar member is applied from the outer ring to the inner ring. By inclining the outer peripheral surface of the inner ring and the inner peripheral surface of the outer ring with respect to the axis of the columnar member, the outer ring is moved in the axial direction of the columnar member while circumscribing the outer ring to the outer peripheral surface of the inner ring. Receives a circumferential tensile force from the inner ring. On the other hand, the inner ring receives the compressive force of the reaction force from the outer ring, and the columnar member receives the abdominal pressure toward the center side as the resultant force of the compressive force from the inner ring.

Since the abdominal pressure is the resultant force of the compressive forces, when the compressive forces in the two directions act at an angle, the resultant force becomes the diagonal line of the parallelogram formed by the vectors in the two directions, so that the columnar member is orthogonal to the axis. Focusing on the section of the 1/4 arc when viewed in the cross section, the resultant force generated in this section is the size of the diagonal line of the square. Therefore, when the columnar member has a cylindrical cross section, in order to most effectively generate the compressive force acting on the inner ring on the columnar member, the 1/4 arc section is evenly arranged in the circumferential direction for the entire circumference (circumference). It becomes rational to place the inner ring.

However, since the inner ring tries to contract in the circumferential direction by receiving a compressive force, if it is continuous in the circumferential direction, it is not possible to apply abdominal pressure to the columnar member, so that the inner ring is separated in the circumferential direction. It is necessary (paragraph 0020).

JP-A-4-327397 (Claim 1, paragraphs 0012 to 0016, FIGS. 1 to 3) Utility Model Registration No. 3180610 (Claim 1, paragraphs 0018 to 0020, FIGS. 1, 2)

In this way, the inner ring needs to be divided in the circumferential direction, but when the columnar member has a cylindrical shape, the inner ring material divided as described above has a length that orbits the outer circumference of the columnar member as a whole. It is most efficient to have a cylinder.

However, even if the inner ring material is separated in the circumferential direction, if the inner ring material orbits the outer circumference of the columnar member as a whole, adjacent inner ring materials can come into contact with each other when each inner ring material receives a compressive force from the outer ring. If they come into contact with each other, the compressive force from the inner ring material cannot be sufficiently applied to the columnar member. Further, for example, when the columnar member is a steel pipe, when it is used in a part where thermal expansion may occur in the used state, the possibility that adjacent inner ring materials come into contact with each other due to thermal expansion increases, and the abdominal pressure increases. Loss is likely to occur.

Based on the above background, the present invention proposes a joint structure of a square steel pipe column having a structure in which the compressive force acting on the inner ring of Patent Document 2 is most effectively generated in the columnar member, but the loss of the compressive force due to contact is not generated. Is.

In the joint structure of the square steel pipe column according to claim 1, the surface of the corner portion on the cross section has a curved surface, is abutted against each other in the axial direction, and is joined to form the upper column member and the lower column member. It is a joint structure of square steel pipe columns consisting of
A concave groove is formed in the circumferential direction at least at each corner of the upper column member and the lower column member at a position separated from the abutting surface of the lower column member.
With the upper pillar member and the upper pillar member while straddling the upper pillar member and the both concave grooves of the lower pillar member in the axial direction at each corner portion on the cross section of the upper pillar member and the lower pillar member butted against each other. A corner member that comes into contact with the outer peripheral surface of the lower pillar member is arranged.
On the outer peripheral side of all the corner members, an outer ring that is continuous in the circumferential direction of the upper pillar member and the lower pillar member and can bear a tensile force is arranged.
The outer ring moves from the upper pillar member side or the lower pillar member side toward both of the abutting surfaces, and the inner peripheral surface of the outer ring is in close contact with the outer peripheral surface of the corner material. Make it a requirement.

"The surface of the corner on the cross section has a curved surface" means that the pillar itself is a square steel pipe, but when viewed in the cross section when cut on a plane orthogonal to the material axis, the surface of the corner is It means that it is formed in a curved surface shape that is convex toward the outer peripheral side in the radial direction. The square steel pipe has four corners, and the surface of each corner has a 1/4 arc shape, so the corner material is placed on the surface side of all corners, and all corner materials are outside. When a compressive force is received from the ring, the force (abdominal pressure) toward the center on the cross section received by the square steel pipe from all the corner members becomes equal to the force received by the circular steel pipe.

This means that, under the same conditions, the force toward the center is the same as the force received by the circular steel pipe. "Same conditions" means that the tension applied to the outer ring is the same. Since the columns are square steel pipes, the parts other than the corners have a flat shape. As shown in FIGS. 2- (a) and 2- (b), when the square steel pipe column 1 receives a force toward the center from the corner members 4 at the corners 21 and 31, flat portions other than the corners 21 and 31. A tensile force acts in the circumferential direction. The magnitude of the curvature (radius of curvature) on the surface of the corner, or the ratio of the radius of curvature to the dimension of the square steel pipe is arbitrary.

"All corner materials receive compressive force from the outer ring" is specifically the inclination of the outer peripheral surface of the corner material from the upper pillar member to the lower pillar member from the center side to the outer peripheral side of the upper pillar member, or what is it? At the same time that the outer ring is inclined in the opposite direction, the inner peripheral surface of the outer ring is also inclined from the center side to the outer peripheral side of the upper pillar member from the upper pillar member to the lower pillar member, or in the opposite direction. Makes it possible.

"The outer peripheral surface of the corner material is inclined from the center side to the outer peripheral side of the upper pillar member from the upper pillar member to the lower pillar member, or an inclination in the opposite direction" means that the outer peripheral surface of the corner material 4 is on the upper side. It means that the upper pillar member 2 is inclined from the pillar member 2 to the lower pillar member 3 in either the central side or the outer peripheral side with respect to the vertical plane. The inclination of the outer peripheral surface of the corner member 4 is the same as the inclination attached to the inner peripheral surface of the outer ring 5.

The inner peripheral surface of the outer ring 5 is on the side far from the surfaces of the upper pillar member 2 and the lower pillar member 3, from the lower side to the lower side in the example shown in FIG. 1- (a), around the outer peripheral surface of the corner member 4. It is inserted (drived) toward the abutting surfaces 2a and 3a of the upper pillar member 2 and the lower pillar member 3. The outer ring 5 is continuous in the circumferential direction of the upper pillar member 2 and the lower pillar member 3, but the inclination of the inner peripheral surface may be formed at least in a section (part) where the corner member 4 is present.

As a result of inserting the outer ring 5, the side of the inner peripheral surface of the outer ring 5 near the surface of the upper pillar member 2 and the lower pillar member 3 approaches the surfaces of the upper pillar member 2 and the lower pillar member 3. Along with this, the inner peripheral surface of the outer ring 5 exerts a compressive force on the outer peripheral surface of the corner member 4 toward the center side of the upper pillar member 2, and the upper pillar member 2 and the lower pillar member 3 are subjected to FIG. 2- (a). ), As shown in (c), abdominal pressure is received from the corners 21 and 31 toward the center. When the outer ring 5 exerts a compressive force on the corner member 4, the outer ring 5 receives a tensile force in the circumferential direction as a reaction force from the corner member 4, and stretches or tries to stretch.

As described above, the surfaces of the corner portions 21 and 31 of the upper column member 2 and the lower column member 3 which are joined to each other to form the square steel tube column 1 come into contact with the outer peripheral surfaces of the upper column member 2 and the lower column member 3. The corner material 4 is arranged, and the outer ring 5 continuous in the circumferential direction of the upper pillar member 2 and the lower pillar member 3 is arranged on the outer peripheral side of all the corner material 4, and the inner peripheral surface of the outer ring 5 is the corner material 4. By bringing it into close contact with the outer peripheral surface, it becomes possible to apply a compressive force from the outer ring 5 to the corner material 4 of all the corner portions 21 and 31. At the same time, the square steel pipe column 1 can receive a force (abdominal pressure) toward the center on the cross section from all the corner members 4, which is equivalent to the force received by the circular steel pipe when the inner ring is arranged all around the circular steel pipe. It will be possible.

On the other hand, unlike the case where the inner ring goes around the outer circumference of the circular steel pipe, the corner members 4 and 4 arranged at the adjacent corners 21, 21 (31, 31) do not come into contact with each other, so that the inner ring goes toward the center. There is no loss of force (abdominal pressure). In particular, even when the square steel pipe column 1 is used in a portion where thermal expansion may occur in the used state and the corner member 4 may thermally expand in the circumferential direction, the adjacent corner members 4 and 4 come into contact with each other. Since there is no possibility of this, there is no loss of abdominal pressure due to thermal expansion.

"At least a concave groove is formed in each corner portion in the circumferential direction" means a section of at least the corner portion 21 (31) when the upper column member 2 and the lower column member 3 are viewed axially (in a cross section). In addition, it is said that the concave groove 22 (32) is continuously formed in the circumferential direction. “At least” means that the concave groove 22 (32) needs to be formed only in the section of the corner portion 21 (31) where the corner member 4 is arranged, and the upper column member 2 and the lower column It may be formed so as to orbit (continuously) in the circumferential direction (entire circumference) of the member 3.

The corner members 4 are axially formed in the corner portions 21 and 31 on the cross section of the upper pillar member 2 and the lower pillar member 3 but are abutted against each other, and in the concave grooves 22 and 32 of the upper pillar member 2 and the lower pillar member 3. It is placed across. The "butting surface 2a of the upper pillar member 2" in claim 1 is the lower end surface of the upper pillar member 2, and the "butting surface 3a of the lower pillar member 3" is the upper end surface of the lower pillar member 3.

Here, as shown in FIGS. 1- (a), 2- (a), and (b), the side surface 42 on the butt surface 2a and 3a side of the convex portion 41 of the corner member 4 and the concave surface 42 in contact with the side surface 42. The side surfaces 23 and 33 of the grooves 22 and 32 are inclined from the concave groove 22 and 32 sides toward the abutting surfaces 2a and 3a from the center side to the outer peripheral side on the cross section of the upper pillar member 2 and the lower pillar member 3. If so (claim 2), when the corner member 4 receives a force from the outer ring 5 toward the center side on the cross section, both of the corner member 4 are brought into close contact with each other to the upper pillar member 2 and the lower pillar member 3. It becomes possible to apply the force to make it work.

The convex portion 41 fits into the concave grooves 22 and 32 from the outer peripheral side to the center side of the upper pillar member 2 and the lower pillar member 3, or fits in a state close to fitting. At this time, the side surface 42 of the convex portion 41 and the side surfaces 23 and 33 of the concave grooves 22 and 32 are engaged with each other in the axial direction of the upper pillar member 2 and the lower pillar member 3, and the side surface 42 faces the side surface 23 vertically downward. And engages the side surface 33 vertically upward.

When the corner member 4 receives a force from the outer ring 5 toward the center side on the cross section, a force perpendicular to the surface is applied to the upper column member 2 and the lower column from the side surface 42 on the abutting surface 2a and 3a side of the convex portion 41. It acts on the member 3. Since the force acting on the upper column member 2 has a vertically downward component and the force acting on the lower column member 3 has an upward component, the upper column member 2 and the lower column member 3 are pivoted to each other from the convex portion 41. A force (compressive force) that tries to bring them into close contact with each other can be applied. In order to exert this effect, it is appropriate that the side surface 42 of the convex portion 41 of the corner member 4 is in contact with the side surface 42 on the butt surface 2a and 3a side of the concave grooves 22 and 32.

Corner members that come into contact with the outer peripheral surfaces of the upper and lower column members are arranged on the surfaces of the corners of the upper and lower column members that are joined to each other to form a square steel tube column, and the outer peripheral side of all the corner members. Since the outer ring is arranged in the outer ring and the inner peripheral surface of the outer ring is brought into close contact with the outer peripheral surface of the corner material, a compressive force can be applied to the corner material at all corners from the outer ring. At the same time, a force (abdominal pressure) toward the center on the cross section, which is equivalent to the force received by the circular steel pipe when the inner ring is arranged on the entire circumference of the circular steel pipe, can be applied to the square steel pipe column from all corner materials. it can.

Further, unlike the case where the inner ring goes around the outer circumference of the circular steel pipe, the corner members at the adjacent corners do not come into contact with each other, so that the force toward the center is not lost. In particular, when a square steel pipe column is used in a part where thermal expansion may occur in use, and even if the corner members may thermally expand, adjacent corner members are unlikely to come into contact with each other. There is no loss of abdominal pressure due to swelling.

(A) is a vertical sectional view showing a state in which an upper column member and a lower column member constituting a square steel pipe column are joined by using a corner member and an outer ring, and (b) is a sectional view taken along line xx of (a). Is. (A) is an enlarged view of FIG. 1- (a), (b) is an enlarged view of the concave groove portion of FIG. 1- (b), and (c) is a side surface and a concave portion of the convex portion of the corner material shown in (a). It is an enlarged view of (a) which showed the state of the force generated with the side surface of the groove on the butt surface side. (A) is a horizontal cross-sectional view showing an example in which the corner material is arranged only in the corner portion of the upper pillar member and the lower pillar member, and (b) is the corner material from the corner portion to the flat section. Is a horizontal cross-sectional view showing an example when the corner members are arranged, and (c) is a horizontal cross-sectional view showing an example when the corner material is arranged only in the section near the center of the corner portion. It is a distribution map which showed the bending moment when the joint position of the upper column member and the lower column member is set so that the end bending moment of the beam (beam member) which constitutes a column / beam frame becomes uniform.

FIG. 1 shows a square steel pipe column composed of an upper column member 2 and a lower column member 3 in which the surfaces of the corner portions 21 and 31 on the cross section form a curved surface, are abutted against each other in the axial direction, and are joined to form a square steel pipe column 1. A specific example of the joint structure of the above is shown. As shown in FIG. 1- (b), square steel pipes are used for the upper column member 2 and the lower column member 3 so that the surface of the corner portion 21 (31) forms a 1/4 arc. Since FIGS. 1- (b) and 2- (c) are horizontal cross-sectional views of the upper pillar member 2, only the corner portion 21 of the upper pillar member 2 is visible here, but the upper pillar member 2 The corner portion 31 of the lower pillar member 3 is located at the same position as the corner portion 21.

A position at a position at a distance from the lower end surface of the upper pillar member 2 and the upper end surface of the lower pillar member 3, which are the abutting surfaces 2a and 3a of the upper pillar member 2 and the lower pillar member 3, to the opposite sides of the abutting surfaces 2a and 3a. Recessed grooves 22 and 32 are formed in at least the corner portions 21 and 31 in the circumferential direction. The concave grooves 21 and 31 have a width such that at least a part of the convex portion 41 of the corner member 4 entering the concave grooves 22 and 32 can be accommodated in the axial direction of the upper pillar member 2 and the lower pillar member 3. “At least” means that the entire convex portion 41 does not necessarily have to fit in the thickness direction of the corner member 4. As shown in FIG. 1- (a), the corner member 4 is installed so as to straddle between the concave groove 22 of the upper pillar member 2 and the concave groove 32 of the lower pillar member 3, and therefore, at least in both concave grooves 22 and 32. It has a straddling width, and the convex portions 41 of the corner member 4 are formed at two positions on both sides in the width direction.

The side surfaces 23 and 33 on the butt surfaces 2a and 3a of the recessed grooves 22 and 32 have the center on the cross section of the upper pillar member 2 and the lower pillar member 3 from the concave groove 22 and 32 side to the butt surface 2a and 3a side. It may be sloped from the side to the outer circumference. In that case, on the inner peripheral surface of the corner material 4, the side surfaces 42 on the butt surface 2a and 3a side of the convex portions 41 and 41 corresponding to the both concave grooves 22 and 32 also have the butt surface 2a from the concave groove 22 and 32 side. The upper pillar member 2 and the lower pillar member 3 are inclined from the central side to the outer peripheral side on the cross section toward the 3a side.

The upper pillar member 2 and the lower pillar member 3 are abutted against each other at the corners 21 and 31 on the cross section of the upper pillar member 2 and the lower pillar member 3 while straddling the both concave grooves 22 and 32 of the upper pillar member 2 and the lower pillar member 3 in the axial direction. A corner member 4 that comes into contact with the outer peripheral surfaces of the pillar member 2 and the lower pillar member 3 is arranged. On the outer peripheral side of all the corner members 4, an outer ring 5 that is continuous in the circumferential direction of the upper pillar member 2 and the lower pillar member 3 and can bear a tensile force is arranged. The outer ring 5 is brought into close contact with the outer peripheral surfaces of all the corner members 4 so that the two convex portions 41 and 41 of each corner member 4 enter the concave grooves 22 and 32, so that at least the upper pillar member 2 and the lower pillar member 3 are in contact with each other. Has a width to straddle. Specifically, as shown in FIG. 1- (a), it is appropriate to have a width that straddles the two convex portions 41, 41 of the corner member 4.

The outer peripheral surface of the corner member 4 is inclined from the upper pillar member 2 to the lower pillar member 3 from the center side to the outer peripheral side of the upper pillar member 2 or in the opposite direction. The inner peripheral surface of the outer ring 5 in contact with the outer ring 5 also has an inclination from the center side to the outer peripheral side of the upper pillar member 2 from the upper pillar member 2 to the lower pillar member 3, or the outer peripheral surface of the corner member 4 in the opposite direction. It is sloped in the same direction. In the examples shown in FIGS. 1 and 2, the outer peripheral surface of the corner member 4 and the inner peripheral surface of the outer ring 5 are inclined from the center side to the outer peripheral side of the upper pillar member 2 from the upper pillar member 2 to the lower pillar member 3. An example is shown when this is done.

From the state where the abutting surfaces 2a and 3a of the upper pillar member 2 and the lower pillar member 3 shown in FIG. 1- (a) are in contact with each other (close contact), the outer ring 5 is on the upper pillar member 2 side or the lower pillar member 3 side. Is moved toward both abutting surfaces 2a and 3a. As the inner peripheral surface of the outer ring 5 is in close contact with the outer peripheral surface of the corner material 4, the outer ring 5 exerts a compressive force on the corner material 4, and as shown in FIG. 2- (b), the upper pillar member 2 and the lower pillar The members 3 are joined to each other in a state of receiving abdominal pressure from the corner portions 21 and 31 toward the center side. Tools such as actuators and hammers are used to move the outer ring 5.

In the example shown in FIGS. 1 and 2, the outer ring 5 is moved from the upper column member 2 side toward both abutting surfaces 2a and 3a, so that the inner peripheral surface of the outer ring 5 is the outer peripheral surface of the corner member 4. 2-Press to the center side of the upper pillar member 2 and the lower pillar member 3 as shown in (a), and from the corners 21 and 31 of the upper pillar member 2 and the lower pillar member 3 as shown in (b). Apply abdominal pressure. At the same time, a tensile force acts on the outer ring 5 in the circumferential direction, and a compressive force acts on the upper column member 2 and the lower column member 3 in the circumferential direction. As a result of the outer ring 5 coming into close contact with the corner member 4, the upper column member 2 and the lower column member 3 are joined so that the axial compressive force and the horizontal shear force are mainly transmitted.

In FIG. 2- (b), each side surface 42 of the convex portion 41, 41 of the corner material 4 comes into contact with the side surfaces 23, 33 on the butt surface 2a, 3a side of the concave groove 22, 32, so that the upper pillar is formed from the corner material 4. An example of forming the side surfaces 42, 23, and 33 in the case where the upper column member 2 and the lower column member 3 are made to apply a compressive force in the axial direction to each other when an abdominal pressure is applied to the member 2 and the lower column member 3. Shown. On the side surface 42 of the convex portion 41 and the side surfaces 23 and 32 of the concave grooves 22 and 32, the cross sections of the upper pillar member 2 and the lower pillar member 3 are formed from the concave groove 22 and 32 sides to the butt surfaces 2a and 3a as described above. A slope is added from the upper center side to the outer circumference side.

In this example, on the side surface 42 of the convex portion 41 on the upper pillar member 2 side, from the upper pillar member 2 side to the lower pillar member 3 side, the upper pillar member 2 and the lower pillar member 3 are directed from the central side to the outer peripheral side on the cross section. The side surface 42 of the convex portion 41 on the lower pillar member 3 side is inclined, and the upper pillar member 2 and the lower pillar member 3 are on the outer peripheral side from the center side on the cross section from the lower pillar member 3 side to the upper pillar member 2 side. There is a slope towards.

FIGS. 3-(a) to 3 (c) show an example in which the peripheral length of the corner member 4 circumscribing the surface of the corner portion 21 (31) is changed. (A) shows an example in which the peripheral length of the corner member 4 is made equal to the length of the curved surface section of the corner portion 21 (31). In this case, the abdominal pressure can be applied to the entire section of the corner portion 21 (31) from the entire length of the corner member 4.

(B) is a case where the peripheral length of the corner member 4 is made larger than the length of the curved surface section of the corner portion 21 (31), and the corner member 4 has a curved section and a straight section. In this case, the abdominal pressure can be applied to the entire section of the corner portion 21 (31) from the curved section of the corner member 4, but the abdominal pressure is not applied to the straight section. (C) shows an example in which the peripheral length of the corner member 4 is shorter than the length of the curved surface section of the corner portion 21 (31). In this case, the abdominal pressure can be applied to the corner portion 21 (31) from the entire length of the corner member 4, but since the pressure from both ends of the corner member 4 acts on the corner portion 21 (31), the upper column member 2 And there is a possibility of causing local stress in the lower column member 3.

FIG. 4 shows the square steel column 1 and the beam member 6 when a horizontal force is applied to the column / beam frame composed of the square steel column (column member) 1 composed of the upper column member 2 and the lower column member 3 and the beam member 6. The distribution of the bending moment generated in is shown. As shown here, the upper column member 2 and the lower column are in a state where only the axial compressive force and the horizontal shear force are transmitted at the butt surfaces 2a and 3a, which are the joints (joint) positions between the upper column member 2 and the lower column member 3. If the members 3 are joined, no bending moment is generated in the fitting portion, so that the bending moment can be set to 0.

In the example shown in FIG. 4, the bending moment of the column base of the square steel column 1 on the first floor becomes 0, the bending moment at the position near the column base of the square steel column 1 on the second floor becomes 0, and the bending moment on the third floor becomes 0. This is a case where the joint position of the upper column member 2 and the lower column member 3 is set on each floor so that the bending moment between the column base portion and the column head portion of the square steel tube column 1 becomes zero. Further, in this example, since the bending moments shown by the thick lines at the ends of the beam member 6 are the same, it is possible to standardize the shape, dimensions, and the like of the beam member 6.

1 …… Square steel pipe column (column member),
2 ... Upper pillar member, 21 ... Corner, 22 ... Recessed groove, 23 ... Side, 2a ... Butt surface,
3 ... Lower pillar member, 31 ... Corner, 32 ... Recessed groove, 33 ... Side, 3a ... Butt surface,
4 …… Corner material, 41 …… Convex part, 42 …… Side surface,
5 …… Outer ring,
6 …… Beam member.

Claims (2)

It is a joint structure of a square steel pipe column composed of an upper column member and a lower column member, in which the surface of the corner portion on the cross section forms a curved surface, is abutted against each other in the axial direction, and is joined to form a square steel pipe column.
A concave groove is formed in the circumferential direction at least at each corner of the upper column member and the lower column member at a position separated from the abutting surface of the lower column member.
With the upper pillar member and the upper pillar member while straddling the upper pillar member and the both concave grooves of the lower pillar member in the axial direction at each corner portion on the cross section of the upper pillar member and the lower pillar member butted against each other. A corner member that comes into contact with the outer peripheral surface of the lower pillar member is arranged.
On the outer peripheral side of all the corner members, an outer ring that is continuous in the circumferential direction of the upper pillar member and the lower pillar member and can bear a tensile force is arranged.
The outer ring moves from the upper pillar member side or the lower pillar member side toward both of the abutting surfaces, and the inner peripheral surface of the outer ring is in close contact with the outer peripheral surface of the corner material. Joint structure of square steel pipe columns. The side surface of the inner peripheral surface of the corner material, which corresponds to the two concave grooves, on the butt surface side and the side surface of the concave groove in contact with the side surface are hung from the concave groove side to the butt surface side. The joint structure for a square steel pipe column according to claim 1, wherein the upper column member and the lower column member are inclined from the central side to the outer peripheral side on the cross section.

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