JP2008284575A - Welded column having box shape cross section - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a welded column having a box shape cross section, which welded column can use a welding method of a small heat input such as the gas shielded arc welding and the submerged arc welding, and can reduce the degradation of the quality of steel members when a diaphragm is built in the column having the box shape cross section by welding. <P>SOLUTION: In at least one plane of the welded column which has the box shape cross section and is composed of four skin plates, the outer face of the column is configured by the end face of a diaphragm 3 and the outer faces of two or more skin plates 2 divided into an upper part and a lower part. Then, the diaphragm 3 is welded to the skin plates 2 by the arc welding 12 from outside of the column member. Then, all sides of the diaphragm 3 is welded to the skin plates by the arc welding 11 from inside and by the arc welding 12 from outside. In the arc welding 11, 12, the welding heat input is small. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a welded box type cross-sectional column used for a steel column of a column beam frame.

  As a rectangular cross-section column of a steel frame column, there is a box-shaped cross-section member assembled by corner welding of four skin plates, particularly in a cross section having a large plate thickness. When a diaphragm is welded inside the box-shaped cross-section member, an electroslag welding method is generally used as the welding method (see, for example, Patent Documents 1 and 2).

JP-A-6-93684 Japanese Patent Laid-Open No. 9-308975

  The plate thickness of the diaphragm built horizontally in the box-shaped cross section column is generally larger than the plate thickness of the beam flange to be joined. Therefore, the electroslag welding method is used for joining the skin plate and the diaphragm. A one-pass welding method with large heat input is used. Since the electroslag welding method can form a joint by one-pass welding, there is an advantage that the construction efficiency can be greatly improved as compared with a multi-layer welding method such as a gas shielded arc welding method.

  However, since the electroslag welding method is a high heat input welding method, the heat effect on the joint and the steel around the joint is large, and the strength decreases due to softening of the steel or the toughness decreases due to coarsening of the steel structure. growing. In the case of TMCP steel, where the amount of application has been increasing recently, the strength and toughness of the base metal has been increased by thermal processing control. Therefore, when high heat input welding such as electroslag welding is performed, the base metal The strength reduction of the heat-affected zone where the toughening effect is lost becomes prominent and may cause a serious problem with respect to the destruction of the entire joint.

  On the other hand, gas shielded arc welding (GMAW) and submerged arc welding (SAW) can reduce the heat input by making it multi-layered. However, after assembling the members into a box shape, the inside must be welded. It is difficult. Therefore, when the diaphragm is welded inside the box-shaped cross-section member, at least the last side cannot be welded.

  The present invention is intended to solve the above-described problems, and when a diaphragm is built in a box-shaped cross-section member by welding, a welding method having a small welding heat input can be used, and the material of the steel material An object of the present invention is to provide a welded box type cross section column capable of reducing deterioration.

  A welding box type cross section column according to claim 1 of the present invention is a welding box type cross section column in which a diaphragm is built in a skin plate constituting a column side plate of a box type cross section by welding, and at least one end face of the diaphragm Is located on the outer surface of the skin plate and is joined to the upper and lower skin plates by welding from the outside.

  Specifically, for example, as shown in FIGS. 1 to 4, at least one surface of the welding box type cross section column, the outer surface of the column is constituted by the end surface of the diaphragm and the outer surfaces of two or more skin plates divided vertically. The diaphragm is welded from the outside of the column member. It is possible to weld the entire side of the diaphragm to the skin plate using a welding method with a low welding heat input. Further, it is generally known that when the plate thickness of the skin plate at the beam-column joint increases, the out-of-plane rigidity of the skin plate increases, so that the joint efficiency of the joint increases. In the case of FIG. 4, since the skin plate sandwiched between the upper and lower diaphragms can be increased in thickness, it is possible to increase the joint efficiency of the joint.

  In some cases, the end surface of the diaphragm and the outer surface of the upper and lower skin plates are aligned with each other, or the end surface of the diaphragm is protruded outward from the outer surface of the upper and lower skin plates.

  The welding box type cross section column according to claim 2 of the present invention is the welding box type cross section column according to claim 1, wherein gas shield arc welding (GMAW) or submerged arc welding (SAW) is used for welding the skin plate and the diaphragm. Is used.

  This is the case where GMAW or SAW with low welding heat input is used, and it can be used only for welding from the outside of the diaphragm, but this welding heat input is applied to both welding from the outside of the diaphragm and welding from the inside. It is preferable to use a small welding method. Moreover, it is preferable that these welding methods make the amount of heat input per welding small as a multi-layer pile for one welding line.

(1) When a diaphragm is built into a box-shaped cross-section member by welding, at least one end face of the diaphragm is exposed to the outer surface of the column and joined to the skin plate by welding from the outside, so an arc with low welding heat input Using the welding method, the entire side of the diaphragm can be welded to the skin plate, and the material deterioration of the steel material can be reduced.
(2) A good welded box-shaped cross-section column with no material deterioration can be obtained at low cost.
(3) Since the thickness of the skin plate between the diaphragms can be increased, the joint efficiency of the joint can be increased.

  Hereinafter, the present invention will be described based on the illustrated embodiments. FIG. 1 is a plan view, a front view, and a rear view showing a first embodiment of a welded box-type cross-sectional column of the present invention. FIG. 2 is a plan view, a front view, and a rear view showing the second embodiment. FIG. 3 is a plan view, a front view, and a rear view showing the third embodiment. FIG. 4 is a front view and a perspective view showing the fourth embodiment.

  In the embodiment of FIG. 1, there are three skin plates 1 constituting a column side plate of a box-shaped cross-section member, a skin plate 2 divided on the top and bottom of the remaining one surface, and a rectangular diaphragm 3 with one side exposed to the outer surface of the column. Used. The end surface exposed to the outer surface of the diaphragm 3 is configured so that the end surfaces of the skin plates 1 on both sides and the outer surfaces of the upper and lower skin plates 2 coincide with each other.

  First, the three skin plates 1 are assembled by corner welding 10, and the diaphragm 3 is inserted into the inside from the lateral direction. The end surface exposed to the outer surface of the diaphragm 3 is aligned with the end surfaces of the skin plates 1 on both sides. Three sides of the skin plate 1 and the diaphragm 3 are joined by welding 11 from the inside.

  Next, the remaining one skin plate 2 is placed above and below the diaphragm 3, the end surfaces on both sides of each skin plate 2 are joined to the skin plates 1 on both sides by square welding 10, and the upper and lower skins of the diaphragm 3 are respectively connected to the upper and lower skins. The plate 2 is joined by welding 12 from the outside.

  The end surface of the diaphragm 3 may protrude beyond the outer surface of the upper and lower skin plates 2 in order to reduce the stress acting on the welded portion between the diaphragm and the beam flange.

  As a welding method used for welding 11 and welding 12, it is preferable to use GMAW (gas shield arc welding) or SAW (submerged arc welding), which has a smaller welding heat input than electroslag welding. Furthermore, if multi-layer welding is performed for one weld line, the amount of heat input per welding is reduced, so that although the process is complicated, deterioration of material characteristics can be further suppressed.

  In the embodiment of FIG. 2, a skin plate 1 having two opposing faces and a skin plate 2 divided into the upper and lower parts of the remaining two faces and a rectangular diaphragm 3 in which two opposing sides are exposed to the outer surface of the column are used. The two end surfaces exposed on the outer surface of the diaphragm 3 are configured such that the surfaces thereof coincide with the end surfaces of the skin plates 1 on both sides and the outer surfaces of the upper and lower skin plates 2.

  First, two skin plates 1 facing each other are arranged, and a diaphragm 3 is inserted into the skin plate 1 from the lateral direction. The two end faces exposed on the outer surface of the diaphragm 3 are aligned with the end faces of the skin plates 1 on both sides. Two skin plates 1 and two sides of the diaphragm 3 are joined by welding 11 from the inside.

  Next, the remaining two skin plates 2 are arranged above and below the diaphragm 3, the end surfaces on both sides of each skin plate 2 are joined to the skin plates 1 on both sides by square welding 10, and the upper and lower skins of the diaphragm 3 are respectively connected to the upper and lower skins. The plate 2 is joined by welding 12 from the outside. In addition, although FIG. 2 illustrated the case where the two sides of the diaphragm 3 were exposed to the column outer surface, the three sides and the four sides can also be exposed.

  Also in this case, the end surface of the diaphragm 3 may protrude beyond the outer surface of the upper and lower skin plates 2.

  In the embodiment of FIG. 3, the widened portion 3a is provided at the end of the diaphragm 3 of the embodiment of FIG. 1, and the overall planar shape is convex. The same procedure as in FIG. 1 is used. The widened portion 3a can be provided on two sides and three sides. Also in this case, the end surface of the diaphragm 3 may protrude beyond the outer surface of the upper and lower skin plates 2.

  When the column and the H-shaped cross-section beam are joined, as shown in the embodiment of FIG. 4, the diaphragm 3 is usually provided at the joining position of the upper and lower flanges of the H-shaped cross-section beam. In this case, the skin plate 2 welded to the diaphragm 3 on the outside is composed of three skin plates 2. In this case, it can be manufactured in the same manner as described above. Also in this case, the end surface of the diaphragm 3 may protrude beyond the outer surface of the upper and lower skin plates 2. The skin plate 2 sandwiched between the upper and lower diaphragms 3 can be increased in thickness, and the joint efficiency of the beam can be increased.

  Generally, the skin plate portion of a column has a role of transmitting axial force or shear force. Therefore, it is preferable that the strength of the diaphragm and the welded portion is ensured also on the surface to be welded on the outside. For this purpose, a steel material having a strength equal to or higher than that of the skin plate is used as the diaphragm. The welding part also uses a welding method or material that increases the strength.

The welded structure and welding method of the present invention are particularly effective when used as a skin plate for a steel material that has a large strength drop due to the thermal effect during welding. As an example of such a steel material, for example, a high strength TMCP type high strength steel having a tensile strength exceeding 590 N / mm ² can be cited.

  Needless to say, the present invention is not limited to the illustrated examples.

It is the top view, front view, and back view which show 1st Embodiment of the welding box type cross-section pillar of this invention. It is the top view which shows 2nd Embodiment of the welding box type cross-section pillar of this invention, a front view, and a rear view. It is the top view, front view, and back view which show 3rd Embodiment of the welding box type cross-section pillar of this invention. It is the front view and perspective view which show 4th Embodiment of the welding box type cross-section pillar of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Skin plate 2 ... Skin plate 3 ... Diaphragm 10 ... Square welding 11 ... Arc welding from inside 12 ... Arc welding from outside

Claims (2)

  A welded box-shaped cross-section column in which a diaphragm is built in by welding inside a skin plate that constitutes a column side plate of a box-shaped cross section, and at least one end surface of the diaphragm is positioned on the outer surface of the skin plate, A welded box-shaped cross-section column which is joined to the outside by welding from the outside.   The welding box type cross section column according to claim 1, wherein gas shield arc welding or submerged arc welding is used for welding the skin plate and the diaphragm.

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