JP2925926B2 - Field welding method for square steel pipe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an on-site welding method used when a structural member such as a beam is formed of a square steel pipe and welding of the square steel pipes is performed at a construction site.

[0002]

2. Description of the Related Art Conventionally, as a method for welding such a square steel pipe on site, as shown in FIG. 3, a joining end face 21 of a double-sided steel pipe 20 to be joined is butted and the butted face is welded. The so-called butt welding is generally known.

[0003]

However, in the above-mentioned conventional welding method, as shown in FIG.
In addition to the downward and lateral welding for joining the upper surface and the lateral surface of the rectangular steel pipe, the upward welding when joining the lower surface of the rectangular steel pipe 20 is required. And since this upward welding is a difficult welding operation, butt welding of square steel pipes in factories etc.
By rotating the rectangular steel pipe, the welding is performed without performing upward welding.

However, since it is impossible to rotate a rectangular steel pipe at a construction site, upward welding at the construction site is very difficult, and is not generally practiced. .

[0005] For this reason, there has been a demand for a welding method which can easily and reliably perform a welding operation in a case where a welding operation of welding rectangular steel pipes must be performed on site. Was.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to make it possible to easily and reliably carry out welding joining of square steel pipes at a site without performing an upward welding operation. To provide a method for welding square steel pipes on site.

[0007]

In the method for welding rectangular steel pipes on site according to the present invention, prior to carrying out the welding and joining work,
At the upper part of the joint end of the double-sided steel pipe to be joined, on both sides from the top of the double-sided steel pipe, in a state where the double-sided steel pipe is connected
And forming a notch that is formed integrally with the rectangular steel pipe and has the same shape as the opening of the notch.

[0008] First, the joining end faces of the rectangular steel pipes other than the notched portions are butted, and the lower portions of the rectangular steel pipes are welded to each other by downward welding and lateral welding from the notched portions. Then, the said closing member in the notch, and set <br/> Ke as put upward or found in an opening of the notch, by welding at a downward welding and horizontal welding, both square tube the upper Is welded.

As described above, according to the field welding method of the present invention, the welding is performed by welding other than the notch portion, which is the lower portion of the rectangular steel pipe, and by welding through the closing member, which is the upper portion of the rectangular steel pipe. It is intended to perform welding joining of power double-ended steel pipes.

According to the field welding method of the present invention, by utilizing the notch and the closing member,
Welding of the rectangular steel pipes to be joined can be performed without performing an upward welding operation. From this, it becomes possible to reliably perform the welding joining of the rectangular steel pipes with a simple operation on site.

In the field welding method of the present invention, the notch
With the same shape as the opening of the pipe
To cover the notch (opening) from above
By doing so, the notch is closed. Therefore, both corners
Blockage after welding and joining work at the bottom of the section steel pipe is completed
Attach the member to the notch, that is, open the notch
The work of closing with the closing member can be performed easily and quickly in a downward operation.
I can.

Further, the notch in the field welding method of the present invention
The part is connected to the square steel pipe.
It opens from the surface to both side surfaces. That
After setting the closing member in the opening of this notch,
The tangent shape is bilaterally symmetrical for double-sided steel pipes,
Stress concentration can be reduced.

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a method for welding square steel pipes according to the present invention;

At the construction site, an on-site welding method of a square steel pipe (see FIG. 1) for joining and welding the joining end faces of the square steel pipes to be joined is as follows. the top, successive states to both RHS 1
The notch 2 is formed to open from the upper surface of the double-sided steel pipe to both side surfaces, and the joining end faces of the double-sided steel pipe 1 other than the notch 2 are joined to open the notch 2 . The lower portion of the double-sided steel pipe 1 is welded by downward welding and lateral welding from the side.

Next, a closing member 3 formed integrally with the square steel pipe 1 and having the same shape as the opening of the notch 2 is formed in the opening of the notch 2 formed continuously with the rectangular steel pipe 1. Notch
While being provided so as to cover the opening of the part 2 from above ,
By welding the closing member 3 and the rectangular steel pipe 1 by downward welding and lateral welding, the upper part of the rectangular steel pipe 1 is welded.

The on-site welding method according to the present invention provides a welded joint other than the above-described notch 2 at the lower part of the rectangular steel pipe 1 and a welded joint via the closing member 3 at the upper part of the rectangular steel pipe 1. Thus, the welding and joining of the rectangular steel pipes 1 to be joined are performed.

The notch 2 in this embodiment is the same as that shown in FIG.
(A), when viewed from the side of the rectangular steel pipe 1 , the rectangular steel pipe 1 is notched in a substantially right triangle so as to form a slope 1a from the upper surface to the joint end face. When the joining end surfaces of the two are abutted, a continuous substantially triangular shape having both slopes 1a can be formed. Soshi
The notch 2 continuous with the double-sided steel pipe 1 is made of square steel.
A substantially equilateral triangular notch on both sides of the pipe 1 and a square steel pipe
(1) Opening upward from the substantially square notch on the upper surface
It is formed.

Further, as shown in FIG. 1C, the closing member 3 has two slopes 3a that abut against the slope 1a of the double-sided steel pipe 1, and has an upper surface flush with the upper surface of the double-sided steel pipe 1. It is formed so that it becomes. And this closing member 3 is square
When viewed from the side surface of the steel pipe 1, the upper surface and both slopes 3a are formed in a substantially equilateral triangular shape, and as a whole,
A substantially equilateral triangular portion serving as both sides of the steel pipe 1 and a square steel pipe 1
It is formed from a substantially square-shaped portion serving as an upper surface . This
Therefore, the closing member 3 is inserted into the notch 2 (opening).
The notch 2 can be closed by covering it from above.
It is configured to be able to.

The joining of the double-sided steel pipes 1 employing the above-described field welding method of the present invention is performed by utilizing the notch 2 and the closing member 3 described above. Can be performed without performing an upward welding operation. That is, the notch 2 opened upward is
Using, for example, looking into the notch 2 (opening) from above
In such a state that the rectangular steel pipe 1 can be implemented by downward welding and lateral welding from the notch 2 side ,
Welding and joining work of the lower part of the rectangular steel pipe 1 including the lower surface can be performed without performing upward welding work.

In the field welding method according to the present invention, the notch
From the upper surface of the square steel pipe 1 to both sides
The closing member 3 is placed in the notch 2 (opening) from above.
The notch 2 is closed by making it not work. That
Therefore, after the welding and joining work of the lower part of the rectangular steel pipe 1 is completed
Mounting the closing member 3 to the notch 2
The operation of closing the opening of the notch 2 with the closing member 3 is performed in a downward direction.
It can be easily done in a short time in the business. In addition, this blocking
The work for covering the notch 2 (opening) from above with the member 3 is as follows.
By using the welding backing metal 4 as a guide,
It can be done easily.

Furthermore, the notch in the field welding method of the present invention
The part is connected to the square steel pipe.
It opens from the surface to both side surfaces. for that reason,
Welding shape after setting the closing member in the opening of this notch
Shape becomes bilaterally symmetrical in double-sided steel pipes, causing unnecessary stress
Concentration can be reduced.

[0022] and, from that of these, the current of the present invention
According to the field welding method, the welding connection of the square steel pipes 1 can be reliably performed by a simple operation on site.

FIG. 2 shows another embodiment of the welding and joining state in the field welding method of the present invention, in which the shapes of the notch 2 and the closing member 3 are different. As shown in FIG. 2A, the notch 2 in this embodiment is a square steel pipe.
When viewed from the side, the horizontal surface 1b and the rising surface 1c are notched in a substantially rectangular shape so as to be formed, and when the joining end surfaces of the rectangular steel pipes 1 are abutted, the horizontal surfaces 1b are continuously at the same level. And a continuous substantially square shape can be formed. Then, the notch continuous in this square steel pipe 1
The notch 2 is a substantially square notch on both sides of the square steel pipe 1.
And the substantially square notch on the upper surface of the square steel pipe 1
Are formed as openings.

As shown in FIG. 2C , the closing member 3 in the embodiment shown in FIG. 2 has a horizontal surface 3b and a vertical surface 3b which are in contact with the horizontal surface 1b and the rising surface 1c of the rectangular steel pipe 1. It has a raised surface 3c and is formed so that the upper surface is flush with the upper surface of the double-sided steel pipe 1. When viewed from the side of the rectangular steel pipe 1 , the closing member 3 is formed in a substantially square shape from the upper surface, the horizontal plane 3b, and both rising surfaces 3c, and is formed on both sides of the rectangular steel pipe 1 as a whole.
And a substantially square portion that forms the upper surface of the square steel pipe 1.
And are formed from From this, this blockage
The material 3 is placed over the notch 2 (opening) from above.
So that the notch 2 can be closed.
You.

[0025]

According to the present invention, the welding and joining work of the double-sided steel pipes to be joined by the on-site welding method is performed at the lower part of the double-sided steel pipes.
Utilizing a notch and a closing member, which is performed by welding and joining other than the notch provided in the double-sided steel pipe and by welding and joining through a closing member which is a top of the double-sided steel pipe and closes the notch. It is done by that.

Therefore, according to the in-situ welding method of the present invention, the welding and joining work of the lower portion of the rectangular steel pipe including the lower surface of the rectangular steel pipe can be performed by downward welding and lateral welding from the notch side. The welding and joining work of the steel pipes can be performed without performing the upward welding work, and the welding and joining of the rectangular steel pipes can be reliably performed by a simple work on site.

In the field welding method of the present invention, the notch
With the same shape as the opening of the pipe
To cover the notch (opening) from above
By doing so, the notch is closed. Therefore, both corners
Blockage after welding and joining work at the bottom of the section steel pipe is completed
Attach the member to the notch, that is, open the notch
The work of closing with the closing member can be performed easily and quickly in a downward operation.
I can.

Further, in the field welding method of the present invention,
With the notch connected to the square steel pipe,
It is open from the top surface to both side surfaces. So
After setting the closing member in the opening of this notch
Is symmetrical in the double-sided steel pipe,
Necessary stress concentration can be reduced.

[Brief description of the drawings]

FIG. 1 (a) is a schematic view showing a state before a welding operation in a method for welding a rectangular steel pipe on site according to the present invention, and FIG. 1 (b) is a view showing A of FIG.
(C) is a schematic view showing a state after the welding operation in the on-site welding method of the rectangular steel pipe according to the present invention, and (d) is a sectional view taken along the line A.
FIG. 7C is a sectional view taken along line BB of FIG.

FIG. 2A is a schematic view showing a welded state in another embodiment of the field welding method of the present invention, showing a state before welding work;
(b) is a cross-sectional view taken along the line CC of (a), (c) is a schematic view showing a welded state in another embodiment of the field welding method of the present invention, showing a state after the welding operation, and (d) () Is a sectional view taken along line DD of (c).

FIG. 3 (a) is a schematic view showing a conventional method for welding a square steel pipe on site, and FIG. 3 (b) is a sectional view taken along line EE of FIG. 3 (a).

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Square steel pipe, 1a ... Slope, 1b ... Horizontal plane, 1c ... Rising surface, 2 ... Notch part, 3 ... Closing member, 3a ... Slope, 3b ... Horizontal plane, 3c ... Rising surface, 4 ... Backing metal for welding.

Claims (1)

(57) [Claims] 1. A method for welding rectangular steel pipes at a construction site, in which the joining end faces of the rectangular steel pipes to be joined are butt-joined and welded together. , From the top of the double-sided steel pipe to both sides
Forming a notch portion that opens over , and joining the joining end surfaces of the lower portions of the rectangular steel pipes, which are portions other than the notch portion, with each other, and performing downward welding and lateral welding from the opening side of the notch portion. The lower part of the rectangular steel pipe is welded and joined, and then the notch formed continuously in the rectangular steel pipe is opened.
In the mouth , a closing member formed in the same shape as the opening of the notch portion and integrated with the square steel pipe is placed above the opening of the notch portion.
Together manner provided covering from by welding and the closing member and both RHS downward welding and horizontal welding, the welded joint the upper portion of both square tube, said notches the a lower portion of both square tube A field welding method for a square steel pipe, wherein the double-sided steel pipe to be joined is welded by welding other than a portion and a welding connection via a closing member at an upper part of the double-sided steel pipe.