JPS6346814B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a column base metal fitting for welding together columns with closed sections used in steel structures or steel reinforced concrete structures.

Conventionally, when welding a steel column having a closed cross section of a steel frame structure to a steel plate bottom plate, as shown in FIGS. 1 and 2, a welding groove 4 is provided at the joint of the column 1, and Backing material 2 was prepared and installed separately. In this case, in order to obtain a good weld between the bottom plate 3 and the column 1, the groove 4 at the weld tip of the column 1 must be machined with high precision, which requires a large amount of man-hours. However, it was very difficult to bring the backing material 2 into close contact with the inner surface 1' of the flange of the support column 1. In particular, in order to improve the adhesion of the backing material 2 to the inner surface of the flange of the column 1, a method is generally used in which the backing material 2 is divided and installed. However, when this split backing material 2 is used, the welding becomes discontinuous at the seam 7, so there is a drawback that welding defects inevitably occur at this portion. Additionally, ribs 6 were required to strengthen the column base.

The object of the present invention is to provide an easy-to-manufacture column base metal fitting that eliminates the conventional drawbacks of welding a column having such a closed cross section to the bottom plate, and can obtain a welded part with high reliability in terms of strength. A peripheral protrusion corresponding to the closed cross section of a column having a closed cross section to be joined, a uniform welding groove and a backing part provided on the protrusion, are integrally formed with the bottom plate. It is characterized by what it did.

The present invention will be explained based on examples. 3 and 4 show a first embodiment of the present invention, in which a column base metal fitting 8 is provided with a peripheral protrusion 11 on a bottom plate 3 corresponding to the cross-sectional shape of the column 1 having a closed cross section 12. Furthermore, this protruding part 11 has a welding groove part 9 having a uniformly sloped surface and a backing part 1 set so as to be almost in contact with the flange inner surface 1' of the column 1 to be welded.
0 and is formed into an integral structure by casting or forging. In actual welding, the setting of the column 1 and the column base hardware 8 is such that the outer surface of the backing portion 10 is in close contact with the flange inner surface 1' of the column 1. This is done by inserting it into the column cross section 12. The welding work is performed after adjusting the axial distance between the groove portion 9 of the column base hardware 8 and the joint end of the column 1. Center alignment between column 1 and bottom plate 3, backing part 10 and flange inner surface 1' of column 1
No particular effort is required to obtain adhesion to the material. In FIGS. 3 and 4, the column base hardware 8 shows an example of a fixed type in which a plurality of anchor bolt holes 15 are installed on the periphery. Of course, it is also possible to provide the bolt holes 15 in the center of the bottom plate 3.

Further, as shown in FIG. 5 and subsequent figures, the welded portion 13 can be provided on the bottom plate 3 at a position away from the bottom surface 5. Furthermore, as shown in FIGS. 7 and 8, the welded ends of the column 1 are placed at several locations on the groove 9 of the column base hardware 8 (preferably at three locations to prevent rattling). Providing the positioning protrusion 14 for positioning in the column axis direction is effective in increasing work efficiency.

The present invention can achieve the following effects due to the above-described structural features.

(1) Since the welding groove and backing material are provided in advance on the column base hardware side, there is no need for a groove and backing material on the column side, resulting in a significant reduction in processing man-hours.

(2) Since grooves and backing parts with high dimensional accuracy can be obtained, there is no longer a gap between the backing material and the column that becomes large, or discontinuous parts of the backing material, which occur in the past. Therefore, a good weld can be obtained.

(3) The column base hardware itself has a backing part, which is tightly inserted into the inner surface of the column flange, eliminating misalignment between the bottom plate and the column.

[Brief explanation of drawings]

1 and 2 are a plan view and a vertical cross-sectional view of a conventional column base, and FIGS. 3 to 8 show embodiments of the present invention, and FIG. 3 is a first embodiment. 4 is a plan view thereof, FIGS. 5 to 7 are longitudinal sectional views of other embodiments, and FIG. 8 is a plan view of the embodiment shown in FIG. 1: Column, 9: Groove portion, 3: Bottom plate, 10: Backing portion, 8: Column base hardware of the present invention, 11: Peripheral protrusion portion.

Claims (1)

[Claims] 1. A peripheral protrusion corresponding to the closed cross section of a column having a closed cross section to be joined, a uniform welding groove and a backing part provided on the protrusion, are integrally formed with the bottom plate. Column base hardware.