JP3974859B2 - Column base hardware - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a column base metal fitting suitable for use in a steel-framed reinforced concrete building.
[0002]
[Prior art]
As a column base metal used for conventional steel reinforced concrete construction (SRC construction), Patent Document 1 discloses that a steel pillar has a cross-sectional shape (substantially cross-shaped, substantially T-shaped, substantially L-shaped) on a bottom plate having anchor bolt holes. The protrusion has an adapted protrusion, and the protrusion has an inclined portion of the bottom plate to relieve local stress concentration, and anchor bolt holes at or near four intersections on the extension line of each flange portion of the protrusion. The column base hardware is described in which the distance from the outer surface of each flange portion of the projecting portion to the outer surface of the bottom plate is 100 mm or less in plan view.
[0003]
In Patent Document 2, a bottom plate provided with a bolt hole through which an anchor bolt passes, a solid or hollow barrel portion standing integrally on the bottom plate, and a lower end portion of a steel column to be erected are joined to the barrel. There is described a column base hardware having an upper plate integrally formed on the part and projecting at least a part of the outer periphery to the side of the body part.
[0004]
[Patent Document 1]
JP-A-6-257219 [Patent Document 2]
JP-A-5-287805 [0005]
[Problems to be solved by the invention]
Patent document 1 can reduce the external dimension of the reinforced concrete provided around a column base metal fitting, and can utilize the utilization space of a building effectively. However, since the protrusion part suitable for the cross-sectional shape (substantially cross shape etc.) of a steel column is formed on a bottom plate, when welding a steel column, there exists a problem that the welding attachment position of a steel column is restricted.
[0006]
According to Patent Document 2, the amount of the bottom plate protruding laterally from the outer periphery of the flat cross-sectional shape of the steel column is reduced, and the reinforcing bars arranged in the axial direction of the column in the vicinity of the outer periphery of the steel column cross section interfere with each other. Can be prevented. Moreover, in the 1st Example, since the upper board is formed in the plane, the welding attachment position of a steel column is not restrict | limited, There exists an advantage with a high freedom degree. However, since the bottom plate, the body portion, and the top plate are integrally formed of casting, there is a problem that the manufacturing becomes complicated and the manufacturing cost increases.
[0007]
Therefore, an object of the present invention is to provide a column base hardware that can be manufactured at a low cost, with a high degree of freedom without restricting the welding position of the steel column.
[0008]
[Means for Solving the Problems]
The column base metal of the present invention is formed by welding a cast upper plate and a steel plate bottom plate, and the upper plate forms a plane for welding the steel column at the upper part, and the bottom plate at the lower part at the lower part. A hollow body provided with a groove for welding is formed, and an anchor bolt hole is provided on the outer peripheral portion of the bottom plate so as to be substantially within the plane cross-sectional area of the upper plate. At least one of them is provided with a vent hole for venting gas that leads to a hollow portion in the body portion of the upper plate.
[0009]
[Action]
In the column base metal of the present invention, when the steel column is welded, the upper part of the upper plate is flat, so that the welding attachment position of the steel column is not restricted and the degree of freedom is increased. In addition, since the bottom plate made of general-purpose steel plate and the upper plate made of cast metal are welded to each other, the manufacturing cost can be reduced as compared with the conventional cast-integrated column base metal. In addition, since the anchor bolt holes provided on the outer periphery of the bottom plate are provided at positions that do not protrude from the flat cross-sectional area of the top plate, the outer dimensions of the reinforced concrete provided around the column base hardware can be reduced, and the building space can be reduced. Can be used effectively.
[0010]
Furthermore, since the trunk | drum formed in the lower part of the upper board is hollow, it is comparatively lightweight and it is easy to carry out welding and construction work. Further, by providing at least one of the top plate and the bottom plate with one or a plurality of vent holes for venting to the hollow portion in the body portion of the top plate, when welding the top plate and the bottom plate, the welding gas is Sound welding can be performed without accumulating in the hollow portion in the body portion of the upper plate.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a schematic cross-sectional view of the column base metal of the present invention. FIG. 2 is a sectional view taken along line AA in FIG. 1 and 2, a column base 1 is formed by welding a cast upper plate 2 made of cast steel and a steel plate bottom plate 3 made of rolled steel.
[0012]
On the upper part of the upper plate 2, a plane 4 having a flat cross-sectional outline of a quadrangular shape (vertical 660 mm × horizontal 660 mm) and a smooth finish on the surface was formed as a surface for welding a steel column (not shown). The steel column is freely positioned and welded in the region of the plane 4. A body part 6 having a hollow part 5 was formed so as to protrude from the central part of the lower part of the upper plate 2. The cross-sectional outline of the trunk portion 6 is a square frame shape, and a groove 7 for welding the bottom plate 3 is provided at the lower end of the trunk portion 6. FIG. 3 is an enlarged partial cross-sectional view of a groove portion 7 in a portion B in FIG. Further, a vent hole 8 for venting gas from the flat surface 4 of the upper plate 2 to the hollow portion 5 of the trunk portion 6 is provided in the central portion of the upper plate 2.
[0013]
The bottom plate 3 is made of a steel plate having a length of 700 mm, a width of 700 mm, and a thickness of 65 mm. A total of four anchor bolt holes 9 were provided at each of the four corners of the outer peripheral portion of the bottom plate 3. Since the position of the anchor bolt hole 9 is almost within the area of the flat cross-sectional outline of the upper plate 2, the external dimensions of the reinforced concrete provided around the column base 1 can be reduced. In addition, a total of five through holes 10 for venting the gas from the bottom surface of the bottom plate 3 to the hollow portion 5 of the trunk portion 6 were provided in portions corresponding to the center portion of the bottom plate 3 and the four corners in the trunk portion 6. And both were welded in the state which made the upper surface of the baseplate 3 contact | abutd to the groove | channel 7 of the trunk | drum 6 of the upper board 2, and the column base 1 was completed.
[0014]
The through holes 8 and 10 for venting may be provided on at least one of the upper plate 2 and the bottom plate 3. It is preferable to form the through holes 8 and 10 on the bottom plate 3 made of a steel plate rather than forming it on the upper plate 2. Further, the through holes 8 and 10 may be provided in the top plate 2 and the bottom plate 3 respectively at one place or a plurality of places.
[0015]
FIG. 4 shows a column base hardware according to another embodiment of the present invention. FIG. 4 corresponds to a cross-sectional view taken along line AA in FIG. In FIG. 4, a total of twelve anchor bolt holes 9 are provided, one at each of the four corners of the outer periphery of the bottom plate 3 and one at the center of the side. Since the position of the anchor bolt hole 9 is almost within the area of the flat cross-sectional outline of the upper plate 2, the external dimensions of the reinforced concrete provided around the column base 1 can be reduced.
[0016]
【The invention's effect】
According to the column base metal of the present invention, it is particularly suitable for use in a steel-framed reinforced concrete building, the welding attachment position of the steel column is not restricted, the degree of freedom is high, and the manufacturing cost can be reduced.
[Brief description of the drawings]
FIG. 1 shows a schematic cross-sectional view of a column base metal of the present invention.
FIG. 2 is a cross-sectional view taken along line AA in FIG.
FIG. 3 is an enlarged partial cross-sectional view of a groove portion of a portion B in FIG.
FIG. 4 shows a cross-sectional view of a column base metal of another embodiment of the present invention.
[Explanation of symbols]
1 Column base, 2 Top plate, 3 Bottom plate, 4 Plane, 5 Hollow part,
6 trunk, 7 groove, 8 through hole, 9 anchor bolt hole, 10 through hole

Claims (1)

The upper plate made of steel and the bottom plate made of steel plate are welded. The upper plate forms a plane for welding the steel column at the upper part, and a groove for welding the bottom plate at the lower part is provided at the lower part. The bottom plate is provided with anchor bolt holes on the outer periphery thereof so as to be substantially within the flat cross-sectional area of the top plate, and at least one of the top plate and the bottom plate is provided with the top plate. A column base metal having a vent hole for venting communicating with a hollow portion in the body portion of the cylinder.

Images