JPH0744537U - Pillar hardware - Google Patents

Abstract

(57) [Summary] [Structure] A column base metal fitting of the present invention of a type in which anchor bolts are fixed through holes 15 provided in the bottom plate 3 is a peripheral projecting portion having a sectional shape corresponding to the column 1 having a rectangular closed cross section. 11
And a uniform welding groove 9 provided at the upper end of the protrusion 11.
And a backing part 10 protruding from the inside of the groove part 9.
The groove portion 9 is provided with a plurality of positioning projections 14 in the column axis direction. [Effect] Since the groove is provided with a positioning protrusion for maintaining a predetermined gap in the axial direction of the column, the positional accuracy in the axial direction of the column is secured, and at the same time, a gap adjustment work error is eliminated. . Further, since the peripheral protruding portion is sufficiently high, the bottom plate is not thermally deformed at the time of welding, and thus the rigidity of the column base metal member in the rotational direction with respect to the basic concrete is not reduced.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a column base metal member for welding and joining a column having a closed cross section used for a steel frame structure or a steel frame reinforced concrete structure.

[0002]

[Problems to be solved by conventional techniques and devices]

 Conventionally, when welding a steel column having a closed cross section for a steel structure to a steel plate bottom plate, as shown in FIGS. 3 and 4, a welding groove 4 is provided at the joint of the column 1, and The backing material 2 was separately prepared and constructed.

In this case, in order to obtain a good welded portion between the bottom plate 3 and the pillar 1, the groove portion 4 at the welded end portion of the pillar 1 must be processed with high accuracy, which is extremely large. It requires a lot of man-hours, and it is very difficult to bring the backing material 2 into close contact with the inner surface 1 ′ of the flange of the column 1. In particular, in order to improve the closeness of the backing material 2 to the flange inner surface 1 ′ of the pillar 1, as shown in FIG. 3, a method is generally used in which the backing material 2 is divided and installed. However, when this divided backing material 2 is used, the welding becomes discontinuous at the seam 7, so that there is a drawback that welding defects occur at this portion. Also, ribs 6 were needed to strengthen the column base.

In addition, instead of forming a groove at the lower end of the column 1, there is also an example in which a groove is provided on the side of the column base metal piece (FIGS. 5 to 8). The column base metal fittings 8 of FIGS. 5 and 6 are provided with a peripheral projection 11 having a cross-sectional shape corresponding to the column 1 having a closed cross section 12 on the bottom plate 3, and the projection 11 has a uniform projection. It is provided with a welding groove 9 having a slanting surface and a backing portion 10 which is set so as to be almost in contact with the flange inner surface 1'of the column 1 to be welded, and is integrally formed by casting or forging. Is molded into. In actual welding, the pillar 1 and the column base metal fitting 8 are set so that the outer surface of the back support portion 10 is in close contact with the flange inner surface 1 ′ of the pillar 1 so that the column base metal fitting 8 is attached. It is performed by inserting into the column cross section 12.

Further, as shown in FIGS. 7 and 8, the welded portion 13 may be provided on the peripheral edge protruding portion 11 at a position apart from the bottom plate 3. 5 to 7, the column base metal fitting 8 shows an example of a fixed type in which a plurality of anchor bolt holes 15 are installed in the peripheral portion. However, the anchor bolt has a so-called pin structure in order to make the column base movable. There is also an example in which the hole 15 is provided in the central portion of the bottom plate 3.

The welding operation of the column base metal piece 8 is performed after the axial gap between the groove portion 9 of the column base metal piece 8 and the joint end of the column 1 is adjusted. By constructing the column base metal fitting 8 in this way, in order to center the column 1 and the bottom plate 3 and to obtain the close contact between the backing part 10 and the flange inner surface 1 ′ of the column 1, special work labor is required. There is no need. However, the problem remains that it takes time to accurately adjust the gap in the column axis direction.

Therefore, the object of the present invention is to solve the drawbacks of the prior art in welding a column having such a closed cross section to the bottom plate, and to obtain a welded portion with high reliability in terms of strength and dimensional accuracy. It is to provide a column base metal fitting that is easy to manufacture.

[0008]

[Means for Solving the Problems]

 As a result of earnest research in view of the above object, the present inventor has found that a welding groove is provided at the upper end of a peripheral protrusion protruding upward from the bottom plate of the column pedestal, and a positioning protrusion is provided at the groove. The inventors have found that providing the pillars at several locations facilitates the positioning of the pillars, completely prevents distortion of the bottom plate due to welding, and thus enables the pillars to be fixed with strong rigidity, and conceived the present invention.

That is, the column pedestal of the present invention is of a type in which anchor bolts are fixed through holes provided in the bottom plate, and the peripheral projecting portion has a cross-sectional shape corresponding to a column having a rectangular closed cross section to be joined. And a uniform welding groove provided on the upper end of the protrusion and a backing portion protruding from the inside of the groove together with the bottom plate. It is characterized in that a plurality of positioning projections in the column axis direction are provided.

[0010]

[Examples and functions]

 As shown in FIG. 1 and FIG. 2, the column pedestal according to the embodiment of the present invention is provided with a bottom plate 3, a peripheral protruding portion 11 protruding from an upper surface of the bottom plate 3, and an upper end portion of the peripheral protruding portion 11. It comprises a groove portion 9, a backing portion 10 protruding upward from the inside of the groove portion, and projections 14 provided at several places on the groove portion 9.

The height of the peripheral protruding portion 11 is set so that the distance between the bottom plate 3 and the groove portion 9 is sufficiently large as shown in FIG. In the example shown in FIG. 1, the height of the peripheral protrusion 11 is about twice the thickness of the protrusion 11. By having such a high protrusion 11, heat during welding escapes in the middle, and the bottom plate is not heated enough to undergo thermal deformation. On the other hand, if the protrusion 11 is too low or absent, the bottom plate 3 is extremely heated and deforms. Then, the pedestal metal fitting is placed on the basic concrete, and the fixing is performed only by the anchor bolts. Therefore, the adhesion between the bottom plate 5 of the metal fitting and the basic concrete becomes insufficient, and the rigidity in the rotating direction is reduced. In addition, welding work is usually performed by inserting a welding rod in a direction approximately in the middle of the joint surface (lower surface) of the column 1 and the groove portion 9, but in such a case, the protrusion 11 is sufficiently high. And welding work becomes easy.

The groove 9 of the column base metal fitting 8 is provided with several positioning protrusions 14 for keeping the welded end of the column 1 in a predetermined gap in the axial direction of the column. It is desirable to provide the positioning projections 14 at three locations to prevent rattling.

[0013]

[Effect of device]

 The pedestal metal fitting of the present invention has the following effects due to the above structural features. (1) Since the column base metal fitting itself has a backing part that is inserted so as to be in close contact with the inner surface of the flange of the column, there is no misalignment between the bottom plate and the column. (2) Since the groove has a positioning protrusion to maintain a predetermined gap in the column axis direction, position accuracy in the column axis direction is ensured and gap adjustment work mistakes are eliminated. . (3) Since the protruding portion at the peripheral edge is sufficiently high, the bottom plate is not thermally deformed during welding, and there is no reduction in rigidity in the direction of rotation of the column pedestal with respect to the basic concrete. (4) As a concomitant matter, compared with the conventional column base using steel plates, the welding groove and the backing part are provided in advance on the side of the column base, so that the groove is formed on the column side. There is no need to provide or use a backing material, and the processing man-hour is reduced. In addition, since the gap between the backing material and the column and the discontinuity of the backing material are not generated unlike in the conventional case, a good weld can be obtained.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a column base using a column base metal according to an embodiment of the present invention.

FIG. 2 is a plan view of a column pedestal according to an embodiment of the present invention.

FIG. 3 is a transverse cross-sectional view of a column base portion using a conventional steel plate.

FIG. 4 is a vertical cross-sectional view of a column base portion using a conventional steel plate.

FIG. 5 is a vertical cross-sectional view of a column base portion using a column base metal member of a comparative example.

FIG. 6 is a plan view of a column pedestal metal object of a comparative example.

FIG. 7 is a vertical cross-sectional view of a column base portion using a column base metal member of a comparative example.

FIG. 8 is a vertical cross-sectional view of a column base portion using a column base metal member of a comparative example.

[Explanation of symbols]

 1 pillar 3 bottom 8 pillar leg metal fitting 9 groove 10 backing 11 peripheral projection 14 positioning projection

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Shingo Nogami 1-9-1 Kitahama, Wakamatsu-ku, Kitakyushu City, Fukuoka Prefecture Inside the Wakamatsu Factory, Hitachi Metals, Ltd.

Claims (1)

[Scope of utility model registration request] 1. A column base metal fitting of a type in which an anchor bolt is fixed through a hole provided in a bottom plate, and a peripheral projection having a cross-sectional shape corresponding to a column having a rectangular closed cross section to be joined, and an upper end of the projection. A uniform welding groove portion provided in the groove portion and a backing portion protruding from the inside of the groove portion are integrally formed with the bottom plate, and the groove portion has a protrusion for positioning in the column axis direction. A column base metal fitting characterized by being provided in several places.