JPH09273222A - Joint construction method by site welding of beam of box section and joint structure of beam of box section - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joint construction method executed for joint of beams of box section, and a joint construction manufactured by execution of the method. SOLUTION: In the connection parts of a joint member 2 and a beam member 3 opposite to each other, the lower flange 2a of the joint member 2 is projected, the upper flange 3c of the beam member 3 is projected, further, the web 2d on one side of the joint member 2 is projected, the web 3b on the opposite side of the beam member 3 is projected, and hence they are alternately arranged, and backing strips 4a, 5a, 4b, 5b are respectively provided on the inside along the flanges 2c, 3a and the webs 2b, 3d on the non-projecting side. The beam member 3 is hangingly put in between the joint members 2, 2 and confronted with each other, and both are integratedly joined together by full circumference welding.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to an on-site welding joint construction method for joining a so-called box-shaped cross-section beam such as a steel structure-assembled box beam or box truss chord member and diagonal member in a megastructure. The present invention relates to a box-shaped cross-section beam joint structure manufactured by carrying out the same method.

[0002]

2. Description of the Related Art Conventionally, various construction methods for in-situ welding joints for box-shaped cross-section beams in megastructures have been carried out so that the backing metal does not interfere with existing members during construction. For example, as shown in FIG. 3A, a backing metal c is provided on the outer side surface along three sides of the joint member a having a box-shaped cross section except the upper flange a ′, while the beam member b is joined to the upper flange a ′. The portion close to the joint is cut out by a length sufficient for welding work, and the beam member b is hung by a crane or the like between the joint members a and temporarily attached, and then the upper flange a '.
The three sides except for are welded together from the inner surface. afterwards,
An upper flange piece b ′, which is previously cut and provided with a backing metal d, is attached to the hollow portion, and is welded to the beam member b in the original state,
The so-called upper flange retrofitting method has been implemented.

Further, as shown in FIG. 3B, a backing plate e is slidably attached to a lower surface of a member f with a bolt g in advance, and the backing plate e is attached to the diaphragm h after being suspended. A so-called backing metal slide construction method is also used in which the metal fitting e is projected and constructed.

[0004]

In the above-mentioned method of retrofitting the upper flange, the upper flange b'is cut off and then again welded to the web of the beam member b, so that the amount of welding and the amount of work on site increase, Along with that, there is the problem that costs will increase. Further, the backing metal slide construction method has a problem in strength and rigidity of the beam member because a cross-section loss due to the slide bolt hole is likely to occur.

Therefore, an object of the present invention is to reduce the amount of welding at the site to reduce the cost and to secure higher strength and rigidity. The purpose of the present invention is to provide a joint structure of a cross-section beam.

[0006]

As a means for solving the above problems, the field welding joint method for box-shaped cross-section beams according to the invention described in claim 1 is provided at the beam mounting position of the steel column 1. In the field welding joint construction method of the box-shaped cross-section joint member 2 and the box-shaped cross-section beam member 3 joined between the joint members 2 and 2 facing each other, the joint member 2 and the beam member 3
Facing each other, the lower flange 2a of the joint member 2 is protruded, the upper flange 3c of the beam member 3 is protruded, and the web 2d on one side of the joint member 2 is protruded. Side webs 3b are made to project in a staggered shape, and backing plates 4a, 5 are provided along the non-projection side flanges 2c, 3a and webs 2b, 3d on their inner surfaces
a, 4b, 5b are respectively provided, and the beam member 3 is hung between the joint members 2 and 2 so as to face each other,
It is characterized in that they are integrally joined by full circumference welding.

The joint structure according to the second aspect of the present invention is a joint between the joint member 2 having the box-shaped cross section and the beam member 3 having the box-shaped cross section that is joined between the joint members 2 facing each other. As for the structure, the joint member 2 and the beam member 3 have opposing joints, the lower flange 2a of the joint member 2 is projected, the upper flange 3c of the beam member 3 is projected, and the joint member 2 is provided on one side. Web 2d is protruded and the web 3b on the opposite side of the beam member 3 is protruded, and the flanges 2c, 3a and the webs 2b, 3d on the non-projected side are formed.
Along the inner surface of the backing metal 4a, 5a, 4b, 5b
Are respectively provided, the beam members 3 are hung between the joint members 2 and 2 to face each other, and both are integrally joined by full-circumferential welding.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments and examples of the present invention will be described below with reference to the drawings. FIG.
FIG. 3 briefly shows an implementation point of a joint construction method for a box-shaped cross-section beam according to the present invention. According to this joint construction method, a box-shaped cross-section joint member 2 provided at a beam attachment position of a steel frame column 1 and a joint member 2 of the steel frame columns 1 and 1 facing each other are suspended and joined so as to face each other. The beam member 3 having a box-shaped cross section is welded on site. INDUSTRIAL APPLICABILITY The present invention is suitably implemented mainly for in-situ welding of box-shaped cross-section beams in a megastructure or the like that cannot be implemented in the ground structure.

FIG. 2 is an enlarged view of the joint at the joint portion. The joint member 2 and the beam member 3 face each other such that the lower flange 2a of the joint member 2 projects and the upper flange 3c of the beam member 3 projects. In addition, the web 2d on the left side of the joint member 2 in the figure is projected, and the web 3b on the right side of the beam member 3 in the figure is projected to form an alternate shape, and the flange 2 on the non-projection side is formed.
The backing plates 4a, 5a, 4b, 5b are attached to the inner surfaces of the c, 3a and the webs 2b, 3d so as to protrude by a required length. Here, the protruding portions 2a ', 3c', 2d ', 3b' are protruding by substantially equal distances as compared with the non-projecting portions 2c ', 3a', 2b ', and the tip is groove processed. There is. On the other hand, the joining joints on the opposite side are also formed in alternate shapes. However, the joint member 2 has a shape in which the web on the left side in FIG. 1 is projected, and the web on the right side in FIG. 1 of the beam member 3 is projected. This is because the work of suspending and mounting the beam member 3 between the joint members 2 progresses smoothly.

Therefore, in the field welding joint construction method of the box-shaped cross-section beam having the joint structure, when the beam member 3 is hung between the joint members 2 and 2 by a crane or the like so as to face each other, the joint members 2 and 2 are arranged. The beam member 3 is provided on the upper surface of the tip of the lower flange 2a.
The backing plate 5a provided on the lower flange 3a of the beam rests, and the backing plate 5b provided on the web 3d on the non-projecting side of the beam member 3 contacts the web on the projecting side of the joint members 2 and 2. Similarly, the upper flange 3c of the beam member 3 is provided on the upper surface of the backing plate 4a provided on the upper flange 2c of the joint member 2.
And the web 3b on the projecting side of the beam member 3 comes into contact with the backing plate 4b provided on the web 2b on the non-projecting side of the coupling member 2, so that the coupling members 2 and 2 and the beam member 3 Can be arranged to be joined in series. So first,
In order to enhance the safety in implementing the joint construction method, the joint portion between the joint member 2 and the beam member 3 may be tack-welded. In addition,
The distance between the flanges and the webs forming the joint, that is, the so-called welding gap, is about 7 mm.

Thereafter, a worker or a welding robot finally welds the V-shaped groove forming the joint between the joint members 2 and 2 and the beam member 3 by butt welding, and finally welds the entire periphery of the joint to form the joint member 2. And the beam member 3 are integrally joined. In particular, the welding of the lower flanges 2a and 3a is performed in an upward posture, so that the use of a welding robot is indispensable. As described above, the welding work at the site is performed by the joint member 2
Only the entire circumference of the beam member 3 is welded, and the amount of welding can be minimized.

[0012]

According to the field welding joint construction method for box-shaped cross-section beams and the joint structure for box-shaped cross-section beams according to the present invention, the joint portions of the joint members and the beam members are formed in an alternate shape in advance. It can be joined with a backing metal on all four sides, and while reasonably high strength and rigidity can be secured, it is possible to minimize the welding work at the site, and accordingly, in the amount of welding at the site, etc. The cost can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view simply showing a joint structure of a box-shaped cross-section beam according to the present invention.

FIG. 2 is an enlarged perspective view showing the left joint of the joint structure for a box-shaped cross-section beam according to the present invention.

3A and 3B are front views showing a conventional technique.

[Explanation of symbols]

 1 Steel Column 2 Joint Member with Box Section 3 Beam Member with Box Section 2a Lower Flange 3c Upper Flange 2d Web 3b Web 2c Flange 3a Flange 2b Web 3d Web 4a, 5a, 4b, 5b Backing

Claims (2)

[Claims] 1. A field welding joint construction method of a box-shaped cross-section joint member provided at a beam mounting position of a steel frame column and a box-section cross-section beam member joined between the joint members facing each other, wherein: The member and the beam member facing each other, the lower flange of the joint member is projected, the upper flange of the beam member is projected, and the web on one side of the joint member is projected, and The web is made to have a staggered shape, and a flange is provided on the non-stick side and a backing metal is provided on the inner surface along the web, and the beam members are suspended between the joint members so as to face each other. , Characterized in that they are integrally joined by full circumference welding,
Field welding joint method for box-shaped cross-section beams. 2. A joint structure of a box-shaped cross-section joint member provided at a beam attachment position of a steel frame column and a box-shaped cross-section beam member joined between the joint members facing each other, the joint structure comprising: The member and the beam member facing each other, the lower flange of the joint member is projected, the upper flange of the beam member is projected, and the web on one side of the joint member is projected, The web has a projecting staggered shape, a back metal is provided on the inner surface along the non-projecting side flange and the web, and the beam members are hung between the joint members to be opposed to each other, A joint structure with a box-shaped cross-section beam, characterized in that both are integrally joined by full circumference welding.