JP2007308967A - Steel column connection structure and steel column connection method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a steel column connection structure which can correct inclination of a column at a steel column connection portion and exerts excellent workability even if a cross section of the connection portions is expanded, and to provide a steel column connection method. <P>SOLUTION: The steel column connection structure is provided for butting connection surfaces of the upper and lower steel columns 1, 2 against each other to connect the steel columns 1, 2 to each other. The connection surfaces 31, 32 of the upper and lower steel columns 1, 2 are formed into a convex surface and a concave surface having the same radius of curvature a so as to accommodate adjustment of a connection angle between the steel columns 1, 2. Thus when the connection surfaces 31, 32 are connected together, centers of curvature of the respective connection surfaces conform to each other, and therefore relative rotational deviation between the connection surfaces in every direction is allowed around the centers of curvature. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a joining structure of steel columns by a so-called metal touch and a joining method of steel columns, in which joining surfaces of upper and lower steel columns are brought into contact with each other to join the steel columns.

Conventionally, as a method for joining steel columns to each other at a steel construction site, a joining method by full penetration welding or a dry joining method such as high-strength bolt joining is generally used.
By the way, in the field construction of a steel column, it is important to manage the inclination of the column. In the steel construction of JASS6 of the building construction standard specification in the Architectural Institute of Japan, the upper limit of the tolerance of the inclination of the column is set as the accuracy control at the time of building the column. In general, at the time of on-site construction, the inclination of the column is corrected at the joint between the lower layer and the upper layer. In the case of the joining method by complete penetration welding, the inclination of the column at the time of building is corrected using the root gap portion in the groove. Similarly, in the case of the high-strength bolt joining method as described in Patent Document 1, the inclination of the column at the time of building is corrected using the bolt hole of the bolt joint portion.

  In addition, as another joining method, as used in pile joining, a method using a mechanical joint in which a screw hole is provided in a shaft portion, and processing end faces of upper and lower columns horizontally, There is a metal touch bonding method in which end faces are brought into contact with each other. Patent Document 2 describes a configuration in which a metal touch joining method is applied to join outer steel pipes and inner steel pipes in a CFT column (steel pipe concrete column).

Japanese Patent Laid-Open No. 2005-97919 JP-A-10-33263

  However, in the case of the joining method by full penetration welding, the joint where large axial force and bending force are applied has a large amount of welding because the cross section of the steel column becomes large and the plate thickness becomes large. The construction efficiency of the pillar construction method deteriorates. In addition, in the case of a high-strength bolt joining method as described in Patent Document 1, since the joint portion of the pillar has a large area, the number of necessary bolts increases or the bolt diameter increases, and accordingly The number of holes through which the bolts pass increases, and the hole diameter increases. Therefore, the cross-sectional defect | deletion of a steel column increases, and an effective cross section will become small.

  Moreover, when using the mechanical coupling which provides a screw hole in a shaft part as used in joining of piles, high processing accuracy is required for the joint part. Furthermore, as a result of improving the accuracy of the joint, it becomes difficult to correct the inclination of the lower column. Further, in the case of the metal touch bonding method in which the end surfaces of the upper and lower pillars processed horizontally are brought into contact with each other, the inclination of the lower pillar cannot be corrected at the joint portion. Moreover, in the case of the metal touch joining method in the CFT pillar (steel pipe concrete pillar) as described in Patent Document 2, it is difficult to adjust and maintain the gap between the outer steel pipes and the inner steel pipes. Therefore, it is difficult to manage the gap between the outer steel pipes and the inner steel pipes in order to correct the column inclination. Furthermore, although this metal touch joining method can be applied to the joining of steel columns with a closed section such as a steel pipe, it cannot be applied to the joining of steel columns with an open section such as an H-shaped steel.

  The present invention has been made in view of the above circumstances, and it is possible to correct the inclination of the column at the joint portion of the steel column, and the steel column joint structure is excellent in workability even if the cross section of the joint portion becomes large. And it aims at providing the joining method of a steel column.

  In order to achieve the above object, the steel column joining structure according to claim 1 is a steel column joining structure for joining the steel columns by abutting the joining surfaces of the upper and lower steel columns, The joining surfaces of the upper and lower steel columns are curved surfaces that allow adjustment of the joining angle of the steel columns.

  The steel column joining structure according to claim 2 is the invention according to claim 1, wherein one and the other of the joining surfaces of the upper and lower steel columns are a convex curved surface and a concave curved surface having the same radius of curvature. Features.

  A steel column joint structure according to a third aspect is characterized in that, in the invention according to the first or second aspect, at least a part of the joint portion between the joint surfaces is welded.

  The method for joining steel columns according to claim 4, wherein the joining surfaces of the upper and lower steel columns are abutted against each other, and the joining surfaces of the upper and lower steel columns are joined to each other. Is a curved surface that allows adjustment of the joining angle of the steel columns, and the joining surfaces are abutted according to the joining angles of the upper and lower steel columns to join the steel columns.

  According to the present invention, it is possible to correct the inclination of the column at the joint of the steel column by making the joint surface of the steel column curved so as to allow adjustment of the joint angle of the upper and lower steel columns. In addition, excellent workability can be maintained even if the cross section of the joint becomes large. One and the other of the joint surfaces of the upper and lower steel columns can be a convex curved surface and a concave curved surface having the same radius of curvature. Further, by welding at least a part of the joint portion between the joint surfaces of the upper and lower steel columns, shearing force and tensile axial force can be transmitted.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 to FIG. 5 are diagrams for explaining a first embodiment of the present invention. The present embodiment is an application example as a joining structure and joining method for a steel column (steel pipe column) having a circular cross section.

  FIG. 1 shows a state immediately before joining at the time of construction of upper and lower columns. In FIG. 1, reference numeral 1 is a steel column of an upper layer, 2 is a steel column rising from a lower layer, 3 is a steel column 1 serving as a metal touch, 2 joints. The steel column 2 is provided with a flange of a steel beam 6 and a diaphragm 7. The diaphragm 7 is joined to the steel column 2 and the steel columns 1 and 2 are joined at the upper part of the column base. The joint surfaces (metal touch joint surfaces) 31 and 32 of the steel columns 1 and 2 are processed into a convex curved surface and a concave curved surface so as to allow adjustment of the joint angle of the steel columns 1 and 2. In this example, the joint surface 31 is a convex curved surface, and the joint surface 32 is a concave curved surface. However, conversely, the joint surface 31 may be a concave surface and the joint surface 32 may be a convex curved surface. As shown in FIG. 2, the joining surfaces 31 and 32 are processed into curved surfaces having the same curvature radius a to form a part of a spherical surface having the same outer diameter. Therefore, the joint surfaces 31 and 32 have the same center of curvature when they are joined, and relative rotational deviations in all directions are allowed around the center of curvature. Moreover, the joining surfaces 31 and 32 in this example are formed in the whole area of the end surface of the steel columns 1 and 2, as shown in FIG.

  4 and 5 are views showing a state in which the joining angles of the steel columns 1 and 2 are adjusted and joined. When the inclination angle of the steel column 2 is b, the inclination of the steel column 2 can be corrected by the steel column 1 by shifting the joint surfaces 31 and 32 of the steel columns 1 and 2 according to the angle b. . In FIG. 4, c is the floor height, and in FIG. 5, d is the displacement of the joining surfaces 31 and 32 caused by adjusting the joining angle. Although this misalignment d causes a portion that does not become a metal touch on the joining surfaces 31 and 32, surface contact in the circumferential direction of the end surfaces of the steel columns 1 and 2 is ensured.

  When the radius of curvature a is large, the displacement d caused by adjusting the joining angle is increased, and the effective contact area of the joining surfaces 31 and 32 is reduced accordingly. On the other hand, when the curvature radius a is small, the lateral load component applied to the joint surfaces 31 and 32 is increased as compared with the case where the curvature radius a is large. descend. For example, when an inclination of 1/1000 of the column height is set as the upper limit of the management tolerance indicated in the design guideline in the Architectural Institute of Japan, the joint surfaces 31 and 32 after the joint angle is adjusted. It is desirable to set the radius of curvature a so that the effective contact area becomes approximately 75% or more before adjustment of the joining angle. Further, when the radius of curvature a is reduced, it is desirable to increase the yield strength of the joint portion 3 by welding at least a part of the joint surfaces 31 and 32, as will be described later. The joint surfaces 31 and 32 may be subjected to a surface treatment such as blasting in order to improve the bending moment transmission capability.

  FIG. 6 is a diagram for explaining a second embodiment of the present invention. In the first embodiment described above, the joining angle can be adjusted in all directions by processing the joining surfaces 31 and 32 so as to form a part of a spherical surface having the same outer diameter. However, when adjusting the joining angle in the uniaxial direction, as shown in FIG. 6, the joining surfaces 31 and 32 may be processed so as to form a part of a cylindrical surface having the same outer diameter. The cross-sectional shape of the steel columns 1 and 2 is not limited, and may be a circular cross-section as described above, or a closed cross-sectional shape such as a square cross-section as shown in FIG. There may be.

  7 and 8 are diagrams for explaining the third and fourth embodiments of the present invention. The example of FIG. 7 shows steel columns (steel pipe columns) 1 and 2 having a closed cross-sectional shape having a quadrangular cross section as shown in FIG. 7B, and joint surfaces 31 and 32 similar to those of the first embodiment described above, that is, the same. This is an example in which the joining surfaces 31 and 32 processed so as to form a part of a spherical surface having the same outer diameter as shown in FIG. The example of FIG. 8 shows steel columns 1 and 2 having an open cross-sectional shape having an H-shaped cross section as shown in FIG. 8B, and joint surfaces 31 and 32 similar to those of the second embodiment described above, that is, FIG. ) And the joint surfaces 31 and 32 processed so as to form a part of a cylindrical surface having the same outer diameter.

  9, 10 and 11 are diagrams for explaining the fifth, sixth and seventh embodiments of the present invention. The example of FIG. 9 is an example in the case where the outer peripheral portions of the joining surfaces 31 and 32 of the steel columns 1 and 2 having a circular cross section are welded over the entire circumference, 8 is a welded portion, and e is the plate thickness of the joined portion. , F is the thickness of the column shaft portion, g is the thickness of the welded portion 8, h is the outer diameter of the joint portion, and i is the outer diameter of the column shaft portion. Such a welded portion 8 can improve the transmission performance of the shear force and can also transmit the tensile axial force. The welded portion 8 may not be the entire circumference of the joining surfaces 31 and 32 but may be at least a part of the joining portion, and the cross-sectional shapes of the steel columns 1 and 2 are also arbitrary. FIG. 10 shows an example in which the inner peripheral surface of the joint is further bulged inward, and FIG. 11 shows an example in which the outer peripheral surface of the joint is further bulged outward. In either case, by increasing the cross-sectional area of the joint portion of the joint surfaces 31, 32, the contact area can be increased on the joint surfaces 31, 32, and the radius of curvature a can be set large.

  FIG. 12 is a diagram for explaining an eighth embodiment of the present invention. The present invention is not limited to the joining of steel columns, but also the joining of piles, or the joining of CFT columns filled with concrete 11 inside steel columns (steel pipe columns) 1 and 2 having closed cross-sectional shapes as shown in FIG. It can also be applied to. In this example, the protrusions 9 are provided in the whole or a partial area of the inner peripheral surfaces of the steel columns 1 and 2, and the reinforcing bars 10 are provided to be staggered at the joint. The concrete 11 is placed inside the steel columns 1 and 2.

  FIG. 13 is a diagram for explaining a ninth embodiment of the present invention. In the present invention, as shown in FIG. 13, an outer cylinder 12 is disposed on the outer peripheral surface of the joint portion of steel columns (steel pipe columns) 1 and 2 having closed cross-sectional shapes, and concrete (filler) 11 is filled therein. It can also be applied to cases. In this example, the protrusions 9 and 9 are provided on the outer peripheral surface in the vicinity of the joint portion of the steel columns 1 and 2 and the inner peripheral surface of the outer cylinder 12 so as to be alternated at the joint portion. The concrete 11 is filled between the steel columns 1 and 2 and the outer cylinder 12. In this case, the steel pipe column may have an open cross section such as an H-shaped steel. Further, the filler is not limited to concrete, but may be any other material as long as it can transmit a force.

12 and 13 are similar to those in FIGS. 12 and 13, but the structure of the metal touch is different from the conventional one, so that a more reliable transmission of compressive force can be expected as compared with the conventional one.
A combination of the elemental technologies shown in FIGS. 6 to 13 is also possible.

It is a side view at the time of the joining of the steel column in the 1st Embodiment of this invention. It is sectional drawing of the junction part of the steel column of FIG. It is a perspective view of the junction part of the steel column of FIG. It is a side view of the joining state of the steel column of FIG. It is an expanded sectional view of the joined surface in the joined state of the steel column of FIG. It is a perspective view at the time of the joining of the steel column in the 2nd Embodiment of this invention. (A) is a side view at the time of the joining of the steel column in the 3rd Embodiment of this invention, (b) is sectional drawing of the steel column. (A) is a side view at the time of the joining of the steel column in the 4th Embodiment of this invention, (b) is sectional drawing of the steel column. (A) is sectional drawing of the joining state of the steel column in the 5th Embodiment of this invention, (b) is sectional drawing which follows the AA line of (a), (c) is the (a It is sectional drawing which follows the BB line of (). (A) is sectional drawing of the joining state of the steel column in the 6th Embodiment of this invention, (b) is sectional drawing which follows the AA line of (a), (c) is the (a It is sectional drawing which follows the BB line of (). (A) is sectional drawing of the joining state of the steel column in the 7th Embodiment of this invention, (b) is sectional drawing which follows the AA line of (a), (c) is the (a It is sectional drawing which follows the BB line of (). It is sectional drawing of the joining state of the steel column in the 8th Embodiment of this invention. It is sectional drawing of the joining state of the steel column in the 9th Embodiment of this invention.

Explanation of symbols

1, 2 Steel column 3 Joint 8 Weld 31, 32 Join surface a Curvature radius b Inclination

Claims (4)

In the steel column joint structure for joining the steel columns by abutting the joint surfaces of the upper and lower steel columns,
The joining structure of the steel column is characterized in that the joining surfaces of the upper and lower steel columns are curved surfaces that allow adjustment of the joining angle of the steel columns.   2. The steel column joining structure according to claim 1, wherein one and the other of the joining surfaces of the upper and lower steel columns are a convex curved surface and a concave curved surface having the same radius of curvature.   The steel column joint structure according to claim 1 or 2, wherein at least a part of a joint portion between the joint surfaces is welded. In the method of joining steel columns to join the steel columns by abutting the joint surfaces of the upper and lower steel columns,
The joint surfaces of the upper and lower steel columns are curved surfaces that allow adjustment of the joint angle of those steel columns,
The joining surfaces of the steel columns are brought into contact with each other according to the joining angle of the upper and lower steel columns, and the steel columns are joined.

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