JPH04327397A - Joint structure of steel pipe column - Google Patents

Abstract

PURPOSE:To provide the joint structure of steel pipe columns which can improve the reliability of welding and can shorten the time for execution. CONSTITUTION:Metallic fittings 16, 36 for backing are respectively attached to the steel pipe columns 10, 30 formed with erection pieces 12, 32. These metallic fittings 16, 36 for backing are so constituted as to form a prescribed welding width when the ends thereof are butted against each other. Further, the erection piece 12 (or 32) of the one steel pipe column 10 (or 30) projects from the end of this steel pipe column 10 (or 30). A profiling face to aligning the axial centers of the above-mentioned steel pipe columns 10, 30 to each other is provided on this projecting part. The axial centers of the steel pipe columns are automatically aligned by guiding means and the adequate welding width is automatically assured by pressing of the metallic fittings for backing to stoppers. The welding with high reliability is thus executed and the stability of the operations is improved; in addition, the workability is improved.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a steel pipe column joint structure for connecting steel pipe columns to each other before welding.
More specifically, the present invention relates to a steel pipe column joint structure for connecting and temporarily fixing steel pipe columns on which erection pieces are formed by connecting plates.

0002

[Prior Art] Conventionally, in order to fix the ends of two steel pipe columns by welding so that their axes coincide with each other and have a predetermined welding width, an erection machine is conventionally used near the ends of the steel pipe columns to be fixed. Pieces have been formed in advance, a connecting plate is hung between the erection pieces of both steel pipe columns, and in this state, the ends of both steel pipe columns are welded together. FIG. 7 shows an example of the structure of this conventional steel pipe column joint. In the figure, an upper steel pipe column 100 and a lower steel pipe column 20
0 is a steel pipe column to be welded, and rectangular erection pieces 102, 202 are provided on each side near the ends of the upper steel pipe column 100 and the lower steel pipe column 200, respectively. Two bolt tightening holes 102a, 202a are formed in the erection pieces 102, 202, respectively. In this specification, the term "erection piece" refers to a member that is installed around a steel pipe column and is used to temporarily fix (temporarily fix) the steel pipe columns to each other while welding work is being carried out between the steel pipe columns. shall be taken as a thing.

Further, a backing metal fitting 210 is fixed near the end of the inner wall of the lower steel pipe column 200 so as to cover the inner wall. In this steel tube column joint structure, when welding the upper steel tube column 100 and the lower steel tube column 200, the erection piece 102 of the upper steel tube column 100 and the erection piece 202 of the lower steel tube column 200 A long plate-shaped connecting plate 300 is suspended between the two steel pipe columns 100 and 200 to connect them. That is, a total of four bolt tightening holes 302a are formed in the connecting plate 300, and these bolt tightening holes 302a are connected to the erection piece 102,
The two steel pipe columns 100, 200 are connected by fixing the connecting plate 300 with bolts and nuts while matching the bolt tightening holes 102a, 202a of the steel pipe columns 202. In this state, welding is performed together with the backing metal fitting 210 provided on the inner wall of the lower steel pipe column 200, and then each erection piece 102, 202 is cut from the root to complete the welding work of the steel pipe column.

By the way, conventionally, the bolt tightening hole 302a of the connecting plate 300 is connected to the erection piece 102,
202, the upper steel pipe column 100 is hoisted above the lower steel pipe column 200 using a crane or the like, and then the upper steel pipe column 100 is gradually lowered and the upper side is attached to the backing metal fitting 210. Steel pipe column 100
This was done by fitting the backing metal fitting 210 onto the outside and exposing a predetermined length (equal to the welding width) l of the backing metal fitting 210 using a visual guide.

[0005]

[Problems to be Solved by the Invention] However, by the method described above, the upper steel pipe column 100 is externally fitted onto the backing metal fitting 210, and the bolt tightening hole 302a of the connecting plate 300 is connected to the erection piece 102, 202. When matching the bolt tightening holes 102a and 202a, the following problems occurred. That is, when the upper steel pipe column 100 is suspended by a crane and the upper steel pipe column 100 is externally fitted onto the backing fitting 210, the upper steel pipe column 100 is suspended in the horizontal direction.
00 is likely to be shaken, and the backing metal fitting 210 is likely to peel off due to the collision of the upper steel pipe column 100 with the backing member, which also causes a decrease in the reliability of welding.

Further, the work of exposing the backing metal fitting 210 by a predetermined length l is a delicate work that requires moving the heavy upper steel pipe column 100 up and down a minute distance, which is both dangerous and complicated. Ta. . Furthermore, since the connecting plate 300 that is hung between the erection pieces 102 and 202 has a long plate shape, the inner edge of the connecting plate 300 becomes extremely close to the welding part after hanging, so that the welding in the vicinity of the connecting plate 300 is difficult. Therefore, for example, after the erection pieces 102, 202 are cut, the relevant parts are welded, or welding of the relevant parts is omitted. As a result, there was a problem of poor workability or lack of welding reliability.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a steel pipe column joint structure that can improve welding reliability and shorten construction time.

[0008]

[Means for Solving the Problems] A steel pipe column joint structure according to the invention described in claim 1 is a steel pipe column for connecting steel pipe columns on which erection pieces are formed with each other by a connecting plate before welding. In the joint structure, backing metal fittings are attached to both steel pipe columns, and these two backing metal fittings are configured so as to form a predetermined welding width when their ends are brought together,
Furthermore, the tip of the erection piece of at least one of the steel pipe columns protrudes from the end of the steel pipe column, and a tracing surface is formed in the protrusion for aligning the axes of the steel pipe columns. It is something.

Further, the steel pipe column joint structure according to the invention as claimed in claim 2 is such that the connecting plate is pivotally attached to the erection piece of either one of the steel pipe columns in the steel pipe column joint structure according to the invention as claimed in claim 1. It is.

[0010] Furthermore, the steel pipe column joint structure according to the invention as claimed in claim 3 is a steel pipe column joint structure according to the invention as claimed in claim 1 or claim 2, in which the erection on the side of which the tip protrudes from the end part. A notch for welding work is formed in a portion corresponding to the weld between the piece and the connecting plate.

[0011]

[Function] According to the above-mentioned steel pipe column joint structure, the axis of the steel pipe column is automatically aligned by the guide means, and an appropriate welding width can be automatically ensured by abutting the backing metal fitting against the stopper. Therefore, highly reliable welding work can be performed, and the connection work is also facilitated.

0012

[Example] The steel pipe column joint structure of the present invention will be explained below based on an example. FIG. 1 is a partially cutaway front view showing an embodiment of the steel pipe column joint structure according to the present invention, FIG. 2 is a perspective view showing the suspended state before the upper and lower steel pipe columns are welded, and FIG. 1 is an AA sectional view, and FIG. 4 is an enlarged longitudinal sectional view of the welded portion of the steel pipe column after welding. In this example,
The upper steel pipe column 10 and the lower steel pipe column 30 are configured such that each plane cross section has a rectangular shape, and the steel pipe column 10,
Backing metal fittings 16 and 36 are respectively attached to the inner wall ends of the steel pipe columns 10 and 30, and when the ends of the steel pipe columns 10 and 30 are butted together, the ends of both backing metal fittings 16 and 36 are brought into contact with each other,
This ensures an appropriate welding width. That is, the backing fittings 16 and 36 are made of metal and are fixed to the steel pipe columns 10 and 30, respectively, by fusion bonding. Among these, the backing metal fitting 16 attached to the upper steel pipe column 10 projects downward by the welding width from the lower end of the upper steel pipe column 10, while the backing metal fitting 36 attached to the lower steel pipe column 30 does not protrude from the upper end of the lower steel pipe column 30, and the upper end of the backing metal fitting 36 and the upper end of the lower steel pipe column 30 are substantially flush. As a result, by butting the backing fittings 16, 36 of the steel pipe columns 10, 30 against each other, an appropriate welding width can be secured.

[0013] Furthermore, erection pieces 12 and 32 are attached to the outer surfaces 11 and 31 of the ends of the steel pipe columns 10 and 30, respectively, and among these, the erection piece 32 of the lower steel pipe column 30 is a protruding type erection piece. - When the ends of the steel pipe columns 10 and 30 are butted together, this erection piece 32 acts as a guide means to align the axes of both steel pipe columns 10 and 30, and in that state, the connecting plate 50 is suspended between the erection pieces 12 and 32, and the steel pipe columns 10 and 30 can be connected to each other. Here, to explain the erection piece 32 attached to the lower steel pipe column 30, the tip of this erection piece 32 protrudes upward from the upper end of the lower steel pipe column 30, and the protrusion 32a In this case, a tracing surface 32b of the steel pipe column 10 and a welding notch 30c are formed. Therefore, the upper steel pipe column 10 suspended by a crane can slide along the tracing surface 32b and align its axis with the axis of the lower steel pipe column 30. Further, a connecting plate 50 is pivotally attached to the erection piece 32 via a pin 52 (not necessarily a pin, but may also be a bolt and nut), and the pivoting of the connecting plate 50 causes the erection piece 12 to
, 32, and by tightening bolts, the two steel pipe columns 10, 30 can be connected. In this case, the metal fittings 16 for backing the steel pipe columns 10, 30,
36 are butted against each other, the bolt tightening holes 12a, 32a of the erection pieces 12, 32 and the connecting plate 5
Since it will match exactly with the bolt tightening hole 50a of No. 0, it will be sufficient to simply screw the bolt and nut through these bolt tightening holes.

The steel pipe column joint structure of the embodiment is constructed as described above, and its welding work is performed as follows. First, the upper steel pipe column 10 is positioned above the lower steel pipe column 30 using a crane or the like. When the upper steel pipe column 10 is gradually lowered from this state (in the Y direction in Fig. 2), the tracing surface 32b of the erection piece 32 functions as a guide means for the upper steel pipe column 10, and initially it oscillates laterally in the X direction in Fig. 2. The upper steel pipe column 10 is forcibly slid in a direction such that its axis coincides with the axis of the lower steel pipe column 30. When the upper steel pipe column 10 is further lowered from this state, the backing metal fitting 16 of the upper steel pipe column 10 comes into contact with the backing metal fitting 36 of the lower steel pipe column 30.

In this state, the erection piece connecting plate 5
After fixing the upper and lower erection pieces 12, 32 with bolts and nuts according to No. 0, welding is performed by a known method. Thereafter, the bases of the erection pieces 12, 32 are cut with an arc to complete the steel pipe column welding work.

A partial cross-sectional view of the weld after welding is shown in FIG. In the same figure, reference numeral 58 indicates a welded portion, and reference numeral 55
represents a welded metal, and the backing fitting 16 of the upper steel pipe column 10 is welded to the lower steel pipe column 30 by the weld metal 55.

According to the steel pipe column joint structure constructed as described above, the following effects can be obtained. That is, according to the above-mentioned steel pipe column joint structure, after the tracing surface 32b of the erection piece 32 of the upper steel pipe column 10 contacts, the upper steel pipe column 1
0 gradually slides and the axes of both steel pipe columns 10 and 30 are automatically aligned, so that the backing metal fitting 16 of the upper steel pipe column 10 collides with the outer surface 31 of the lower steel pipe column 30. Therefore, the problem of the backing metal fitting 16 peeling off is also eliminated.

Furthermore, while the upper steel pipe column 10 is being lowered along the tracing surface 32b, the backing fitting 16 of the upper steel pipe column 10 and the backing fitting 36 of the lower steel pipe column 30 butt against each other. When this is done, an appropriate welding width can be secured, and in that state, it can be fixed by the connecting plate 50 and welding can be carried out immediately.

Furthermore, when welding the welding portion 58, the part around the steel pipe column where the erection piece 32 is erected is welded from the welding work notch 32c of the erection piece 32, so that the steel pipe It is possible to weld continuously around the column welding part, making the work more efficient.

The present invention is not limited to the embodiments described above, and various modifications can be made without changing the gist of the invention. For example, in the embodiment described above, the welding width of the welded portion 58 was defined by making the protruding length of the backing metal fitting 16 of the upper steel pipe column 10 match the welding width.
As shown in FIG. 5, the backing metal fittings 16 and 36 may be made to protrude by protrusion lengths l1 and l2, respectively, and the total protrusion length may be set as the welding width l of the welding portion 58. Also,
The backing metal fitting 16 is made long and formed to be inserted into the lower steel pipe column 30 beyond the welded part 58, and the backing metal fitting 36 is installed so as to come into contact with the tip of the backing metal fitting 16. You can leave it there. In short, the backing metal fittings 1
6 and the backing metal fitting 36 are butted against each other, the exposed width of the backing metal fitting 36 may match the welding width.

Furthermore, in the embodiment described above, the protruding erection piece 32 protruding from the steel wall around the steel pipe column was provided on the lower steel pipe column 30, but it may be provided on the upper steel pipe column 10. Furthermore, in the above embodiments, the case where the cross-sectional shape of the steel pipe column is square is taken as an example, but the present invention can also be applied to columns such as cylinders.

Furthermore, since the present invention is applied to a joint between a pair of steel pipe columns, a T as shown in FIG.
It can also be applied to cases where each end of the letter-shaped steel pipe column 66 and the ends of the steel pipe columns 68 and 70 are connected.

[0023]

[Effects of the Invention] As explained above, according to the steel pipe column joint structure of the present invention, the axis of the steel pipe column is automatically aligned by the guide means, and the abutment of the backing metal fitting against the stopper automatically aligns the axis of the steel pipe column. An appropriate welding width can be secured, making it possible to perform highly reliable welding, improving work safety, and improving workability.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway view showing an embodiment of a steel pipe column joint structure according to the present invention.

FIG. 2 is a diagram showing a state before upper and lower steel pipe columns are welded.

FIG. 3 is a sectional view taken along line AA in FIG. 1;

FIG. 4 is an enlarged view of a welded portion of a steel pipe column after welding in another example.

FIG. 5 is a diagram for explaining still another embodiment of the steel pipe column joint structure.

FIG. 6 is a diagram for explaining still another embodiment of the steel pipe column joint structure.

FIG. 7 is a partially cutaway view showing a conventional steel pipe column joint structure.

[Explanation of symbols]

10 Upper steel pipe columns 12, 32 Projecting type erection piece 30 Lower steel pipe columns 16, 36 Backing metal fittings

Claims (3)

[Claims] [Claim 1] In a steel pipe column joint structure for connecting steel pipe columns on which erection pieces are formed with a connecting plate before welding, both steel pipe columns are each provided with a backing fitting, Both backing metal fittings are configured to form a predetermined welding width when their ends are butted together, and furthermore, the tip of the erection piece of at least one of the steel pipe columns protrudes from the end of the steel pipe column. A steel pipe column joint structure, characterized in that a protruding portion is formed with a tracing surface for aligning the axes of the steel pipe columns. 2. The steel pipe column joint structure according to claim 1, wherein the connecting plate is pivotally attached to an erection piece of one of the steel pipe columns. 3. A notch for welding work is formed in a portion of the erection piece whose tip portion protrudes from the end of the steel pipe column and the connecting plate at a portion thereof corresponding to the welding portion. A steel pipe column joint structure according to claim 1 or claim 2.