JPH0683913B2 - Structure of backing plate - Google Patents

Description

The present invention relates to the structure of a backing plate.

(Prior Art) Conventionally, in a steel building, as shown in FIGS. 11 and 12,
When the lower end of the column 23 made of square steel is butt-welded to the base plate 22 on the foundation 21, a pair of mountain-shaped backing plates 24 are previously formed on the inner peripheral surface of the lower end of the column 23. These backing plates 24 are made to project downward from the lower end of the column 23 by 5 mm over the entire circumference.

(Problems to be Solved by the Invention) By the way, in the above-mentioned conventional case, since the backing plate 24 is formed in a mountain shape, due to a manufacturing error or a difference between manufacturing manufacturers,
The rounded inner surface of the corner of the pillar 23 and the rounded outer surface of the corner of the backing plate 24 do not match, and each side of the mountain-shaped backing plate 24 is exactly the inner peripheral surface of the lower end of the pillar 23. There was a problem of not going along.

Further, conventionally, the backing plate 24 is not provided with any means for determining the amount of protrusion from the lower end of the column 23, and therefore, when the backing plate 24 is welded to the column 23. However, there is also a problem that the amount of protrusion of the backing plate 24 needs to be determined by a ruler or the like, which is extremely troublesome.

Then, in order to avoid the trouble, the backing plate 24
However, this has a problem that the amount of protrusion of the backing plate 24 cannot be made accurate.

It is an object of the present invention to provide a backing plate structure that can solve the above problems.

(Means for Solving the Problems) In order to solve the above problems, the means adopted by the present invention are
A backing plate is welded to the inner peripheral surface of one end of the first material, which has a polygonal cross section, over substantially the entire circumference, and the backing plate is axially outward from the one end of the first material over the entire circumference. And the one end of the first material is the second end.
In the butt-welded material, the backing plate has the first material-side portion on the outer surface of the longitudinal ends of each corresponding backing plate at the inner peripheral edge of the cross section of the first material, and the first material-side portion is cut off and A notch surface that faces the inner peripheral surface of the material, and at the outer surface side portions of both end portions in the longitudinal direction of each backing plate, the second material side portion rather than the cut-off portion is the first portion when welding to the first material. It is a point that is engaged with the end surface of the one end of one material and serves as an engaging portion that determines the amount of protrusion of each backing plate from the first material.

(Operation) When welding the first material to the second material, the backing plate is previously welded to one end of the first material as follows.

That is, one backing plate is inserted into the inside from one end of the first material, the engaging portion of the backing plate is engaged with the end surface of the one end of the first material, and the backing plate is Weld to the inner surface of the material.

Next, the backing plate is sequentially inserted inside the first material and welded.

Then, one end of the first material is welded to the second material.

(Embodiment) Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings of FIGS. 1 to 8. In FIG. 3, reference numeral 1 is a base, and the base 1 is illustrated as a second member. The base plate 2 is fixed by anchor bolts 3.

Reference numeral 4 denotes a pillar exemplified as the first member, which is the base plate 2
It is butt-welded together and is made of square steel, and as shown in FIG. 2, the groove shape at the lower end thereof is a R-shape. In addition, 5 in FIG. 2 shows a welded portion.

As shown in FIGS. 1 and 4 to 8, before the pillar 4 is welded to the base plate 2, the backing plate 6 is substantially attached to the inner peripheral surface of the lower end of the pillar 4 in advance. Welded all around.

The backing plate 6 is in the form of an elongated flat plate, and is slightly smaller than the length of each side portion at the inner peripheral edge of the cross section of the column 4, and its upper end is welded to the inner peripheral surface of the column 4 over the entire length. Incidentally, 7 in FIG. 6 is a welded portion.

The inner surface of both ends of the backing plate 6 in the longitudinal direction is cut off to form an inclined surface 8 that makes an angle of 45 degrees with the inner surface, and faces the inclined surface 8 of the adjacent backing plate 6 with a small gap. At the same time, both longitudinal ends of the backing plate 6 are butt welded. still,
Reference numeral 9 in FIG. 4 is a welded portion.

The upper side of the outer surface of both ends in the longitudinal direction of the backing plate 6 is cut off in a curved shape, and the curved notch surface 10 facing the inner peripheral surface of the column 4 is formed.
The outer surface side of the lower portion of the cutout surface 10 is a stepped engagement portion 11.

The notch surface 10 faces the curved inner surface of the corner of the column 4 with a small gap in between.

Further, the engaging portion 11 engages with the lower end surface of the pillar 4 to determine the amount of downward projection from the lower end surface of the pillar 4, and in the embodiment,
The amount of protrusion is 5 mm.

According to the embodiment configured as described above, when the pillar 4 is welded to the base plate 2, the backing plate 6 is previously welded to the lower end portion of the pillar 4 as follows.

That is, one backing plate 6 is inserted from the lower end of the pillar 4 into the inside thereof, the engaging portion 11 of the backing plate 6 is engaged with the lower end surface of the pillar 4, and the upper end of the backing plate 6 is The part is welded to the inner surface of the column 4 over the entire length.

Next, the backing plates 6 are sequentially inserted into the pillars 4 and welded, and at the same time, both ends of the adjacent backing plates 6 in the longitudinal direction are welded.

After that, the lower end of the pillar 4 is welded to the base plate 2.

As described above, the backing plate 6 is formed in a flat plate shape having substantially the same length as each side portion in the inner peripheral edge of the cross section of the pillar 4, and the backing plate 6
Since the upper side of the outer surface of both longitudinal end portions is cut out and faces the inner peripheral surface of the pillar 4, a notch surface 10 is formed. Pillar 4
There is no problem of not following the inner peripheral surface of the.

Further, since the backing plate 6 is formed with the engaging portion 11 that engages with the lower end surface of the column 4 and determines the downward projection amount of the column 4, the backing plate 6 is attached to the column 4 as in the conventional case. When welding, it is not necessary to determine the amount of protrusion of the backing plate 6 by a ruler or the amount of division, and the backing plate 6
Can be welded to the pillar 4 easily and accurately.

FIG. 9 shows a second embodiment of the present invention, in which the notch surface 10 is an inclined surface forming an angle of 45 degrees with the outer surface of the backing plate 6, and the notch surface 10 and the corner portion of the column 4 are formed. Since the gap between the rounded inner surface and the rounded inner surface is large and the shape of the rounded inner surface of the corner of the pillar 4 is largely different from the predetermined shape due to manufacturing error or the like, the notch surface 10 and the rounded inner surface are different from each other. It is designed not to interfere.

FIG. 10 shows a third embodiment of the present invention, in which the engaging portion 11 of the backing plate 6 is bent at a right angle to the outer surface side.

In addition, in the embodiment, both ends in the longitudinal direction of the backing plate 6 are butt-welded, but they may not be welded.

Further, in the embodiment, the first material is the pillar and the second material is the base plate, but the first material and the second material may be beams or the like, and is not limited to the embodiment.

Further, in the embodiment, the cross section of the first material is a square, but it may be a polygon such as a triangle.

(Effects of the Invention) As described in detail above, according to the present invention, the amount of protrusion of the backing plate from the first material can be accurately determined by the engaging portion of the backing plate. , Can be welded easily and accurately to the first material having a polygonal cross section.

Also, (a) the backing plate has a flat plate shape having substantially the same length as the corresponding side portions on the inner peripheral edge of the cross section of the first material, and (b) the longitudinal direction of each backing plate. Since the first material side portions on the outer surfaces of both ends are cut off and are notched surfaces that face the inner peripheral surface of the first material, there are manufacturing errors in the rounded inner surfaces of the corners of the first material. However, each backing plate can be fitted along the inner peripheral surface of the first material.

Further, since the engaging portions are formed at both end portions in the longitudinal direction of the backing plate, the backing plate can be securely engaged and held with the end surface of the first material in a stable state.

Further, in forming the engaging portion, (c) at the outer surface side portions of both end portions in the longitudinal direction of each backing plate, the second material side portion rather than the cut-off portion is
A notch surface is formed because it is an engaging portion that engages with the end surface of the one end portion of the first material during welding to the first material and determines the amount of protrusion of each backing plate from the first material. It is possible to form the engaging portion only by itself, and the engaging portion can be formed extremely easily.

Furthermore, since the backing plate is simply a flat plate, the backing plate is not bulky and the backing plate is easy to handle, and the backing plate has the above-mentioned configurations (a), (b), and (c). It does not require a large space when storing.

The structure of the backing plate is extremely simple and can be manufactured at low cost.

Even when the backing plate is made to correspond to several kinds of first materials having different side lengths and corner radiuses, etc., it is possible to make them by simply making several kinds of backing plates having different lengths. Therefore, the backing plate can be easily applied to various first materials at low cost.

And so on.

The present invention has the above advantages and is of great benefit.

[Brief description of drawings]

1 to 8 show a first embodiment of the present invention, FIG. 1 is a bottom view of an essential part, FIG. 2 is a side view of the same, and FIG. 3 is a side view showing a pillar on a foundation. Fig. 4 is a partially enlarged view of Fig. 1, Fig. 5 is a sectional view taken along the line AA of Fig. 2, Fig. 6 is a sectional view taken along the line BB of Fig. 1, and Fig. 7 is a backing plate. Partial front view, FIG. 8 is the same perspective view, FIGS. 9 and 10 are bottom cross-sectional views of the essential parts showing the second and third embodiments of the present invention, and FIG. 11 is a conventional example. FIG. 12 is a bottom view of the main part shown, and FIG. 12 is a side view of the same. 2 ... Base plate (2nd member), 4 ... Pillar (1st member), 6 ... Backing plate, 11 ... Engagement part.

Claims (1)

[Claims] 1. A backing plate is welded to the inner peripheral surface of one end of a first material having a polygonal cross section over substantially the entire circumference, so that the backing plate extends from the one end of the first material to substantially the entire circumference. In the case where the first material is butt-welded to the second material while protruding a predetermined amount outward in the axial direction, the backing plate corresponds to the inner peripheral edge of the cross section of the first material. It is formed into a flat plate shape having substantially the same length as each side portion, and the first material side portion on the outer surface of each longitudinal end portion of each backing plate is cut off and formed as a notch surface facing the inner peripheral surface of the first material. In the outer surface side portions of the longitudinal end portions of each backing plate, the second material side portion rather than the cut-off portion engages with the end surface of the one end portion of the first material when welding to the first material. And an engaging portion that determines the amount of protrusion of each backing plate from the first material. Structure.