JPH09234562A - In-site welding method using band piece - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize the repeated use of a member to be used for temporary connection, and to reduce the working period at a low cost with an absolutely required number of temporarily connected members to be cut after a joint part is welded. SOLUTION: A plurality of erection piece 2 are fixed to an outer circumference in the vicinity of each joint part 6 of steel frame members 1A, 1B such as steel tubes divided into upper and lower parts, a band piece 3 on which more joint plates 4 than the erection pieces 2 are projected is fitted to the erection pieces 2, and the joint plates 4 which are opposite to each other in the vertical direction are temporarily connected by a splice plate 5 to weld the joint parts 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a field welding method using band metal fittings for welding steel columns or beams such as steel pipes in building structures or tower structures on site.

[0002]

2. Description of the Related Art Conventionally, it is well known that a welded surface of a joint portion of a steel frame member or the like in a structure such as a building structure or a tower structure is subjected to gas shield arc welding or the like. In FIG. 7 (A), upper and lower steel members such as steel pipes 10A and 10B are sequentially constructed in a tower shape by welding and joining the joint portions J, which will be briefly described as follows.
FIG. 7 is an enlarged view of G around the joint J in FIG.
As shown in (B), a plurality of, for example, four erection pieces each fixed by welding or the like to the outer periphery of each steel frame member 10A, 10B divided into upper and lower parts in the vicinity of each joint portion J, for example, every 90 ° on the circumference. 21A ... and 21B ... are installed, and these erection pieces 21A.
..Electric pieces 21A, 2 facing each other above and below
By connecting the 1Bs to each other with the splice plates 22 and the bolts 23, the upper and lower steel pipes and other steel members 10A, 1
0B is temporarily connected, the traveling rail 20 is installed on the outer periphery above the joint J, and the joint J is welded by the welding torch 102 of the welding robot 10 mounted on the traveling carriage 30 traveling on the traveling rail 20. It is to join.

FIG. 8 is a view showing details of a joint portion J between the pipes 10A and 10B such as upper and lower steel pipes which are temporarily connected to the erection piece 21A and the splice plate 22 shown in FIG.
After the main surface is welded to the facing surface partitioned by the space 2 and 22, the splice plate 22 is removed, and the entire circumference of the remaining joint is welded. After welding is completed, the upper and lower pipes 10A,
The cutting portion 21 leaving the roots of about 10 mm of the erection pieces 21A and 21B fixed to 10B, respectively.
Gas cutting of C ... These cutting parts 21C ...
The remaining erection pieces 21A and 21B are polished with a polishing machine or the like, and rust-preventive coating is applied.

[0004]

However, in the conventional field welding method by temporary connection as described above, in order to accurately position the shaft centers of steel members such as upper and lower steel pipes in a straight line without mutual deviation. It is necessary to accurately install a large number on the circumference of steel members such as upper and lower steel pipes to which the erection piece should be connected, and the work for installing these increases, and even after the welding of the joint portion is completed, A lot of time was also required for cutting and removing a large number of erection pieces and polishing the remaining portions thereof. Furthermore, it is extremely difficult to lower and drop a large number of erection pieces that have been cut and removed to the ground, and to reuse the erection pieces, and these members must be wastefully discarded.

Therefore, in the present invention, various problems in these conventional field welding methods are solved, the members used for temporary connection can be repeatedly used, and the joint portion is cut after the welding connection. (EN) Provided is an on-site welding method using a band metal fitting that can reduce the construction period at a low cost by minimizing the number of temporary connection members.

[0006]

Therefore, according to the present invention, a plurality of erection pieces are fixed to the outer periphery in the vicinity of each joint of a steel frame member such as a steel pipe which is divided into upper and lower parts. It is characterized in that a band metal having a joining plate provided in a protruding manner is attached, and upper and lower opposing members of the joining plate are temporarily connected by a splice plate to join the joints by welding. Further, the present invention is characterized in that the erection pieces are arranged so as to face each other in at least one diametrical direction of a steel frame member such as a steel pipe. Further, the present invention is characterized in that each of the band metal fittings is composed of two semi-circular arc-shaped bodies provided with two joining plates protruding from each other and arranged to face each other in a diametrical direction of a steel frame member such as a steel pipe. Is a means for solving the problem.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 to 6 show one embodiment of a field welding method using a band metal fitting of the present invention, and FIG. 1 is an exploded perspective view when upper and lower pipes, which are steel frame members such as steel pipes, are temporarily connected by the band metal fitting. FIG. 2 shows a side view applied to the abdominal material in the roof truss frame of the building structure,
FIG. 3 shows a view in which an erection piece is fixed to an upper pipe, FIG. 4 shows a band metal object with a joining plate protruding, and FIG. 5 is a partial cross-section with the band metal object attached and an enlarged view of a main part. is there. FIG. 6 is a diagram showing a state in which the upper and lower pipes are temporarily connected. As shown in FIG. 2A, the roof truss frame of the building structure has an upper chord member 8A and a lower chord member 8
B and a hollow abdomen 1 having a circular cross section and arranged in a zigzag shape therebetween. The abdomen 1 is shown in FIG.
Used for welding the short linear divided upper pipe 1A and lower pipe 1B as shown in Fig. 2 by a joint portion 6, or for the joint portion 6 of a leg portion as shown in Fig. 2B. The upper chord member 8 as shown in FIG. 2 (C).
It is used for field welding of steel frame members such as steel pipes of various forms such as those that are welded and joined by the joint portion 6 of A or the lower chord member 8B.

As shown in FIG. 3, first, a plurality of erection pieces 2 are fixed to the outer periphery in the vicinity of the joint portion 6 of the upper pipe 1A which is a steel frame member such as a steel pipe divided into upper and lower parts by welding or the like. In the present embodiment, at least the upper pipe 1A
The erection pieces 2 and 2 are arranged so as to face each other only in one diametrical direction. 2H is a bolt hole. Although illustration is omitted, the erection piece 2 is similarly fixed to the lower pipe by making the joint portion 6 symmetrical. And
As shown in FIG. 4, a pair of semi-arcuate band metal fittings 3 having two bonding plates 4 and 4 radially protruding from each other and being separated from each other by 90 ° at a circumferential angle are shown in FIGS. ), As clearly shown in the upper half of FIG. 5 (C), the erection piece 2 is provided with the mounting flanges 3F at both ends thereof facing each other in the diametrical direction of the upper pipe 1A.
It is attached by a mounting tool such as a bolt and nut as if it is sandwiched between. That is, the band metal piece 3 is provided with a larger number (double) of the joining plates 4 than the erection piece 2. At that time, as shown in an enlarged view in FIG. 5B, a gap 7 is made to exist between the erection piece 2 and the flange 3F of the band metal fitting 3, and the splice plate 5 is attached to the joint plate 4 described later. It is configured to be able to absorb the error that has occurred. The inner peripheral surface of the main body of the band metal fitting 3 is formed to have the same curvature so as to match the outer peripheral surface of the upper pipe 1A. As shown in FIGS. 5 and 1, the erection piece 2 and the band metal fitting 3 are attached to the lower pipe 1B similarly to the upper pipe 1A, and as shown in FIG. 2 pairs of installed metal fittings for 4 bands
The upper and lower surfaces of the joining plate 4 protruding from the upper and lower sides are sandwiched by the splice plates 5 and 5, and the temporary connection is completed by a fixture such as a bolt and nut.

The grooved portions on the outer periphery of the joints 6 of the upper and lower pipes 1A and 1B, which are constructed as described above and are temporarily connected by the splice plate 5 via the joint plate 4 of the band metal 3, are at least formed by gas shield arc welding or the like. The opposing surfaces partitioned by the splice plates 5 and 5 are joined together by main welding, and then the splice plate 5 attached to the band metal fitting 3 is removed, and the remaining circumference of the joint portion is welded. After welding, remove the band metal 3,
Next, the erection piece 2 attached to the upper and lower pipes 1A and 1B is removed from the pipe by cutting the cutting portion 2C by gas cutting or the like, leaving a root of about 10 mm. After that, the remaining portion of the erection piece 2 and the weld surplus portion of the joint portion 6 on the pipe are smoothly polished by a sander or the like, and the work is finished.

Although one embodiment of the present invention has been described above, the cross-sectional shape of the steel frame member such as a steel pipe (not necessarily circular or hollow) and the groove of the joint are within the scope of the gist of the present invention. Shape and welding form, installation form of erection piece on steel frame member such as steel pipe, number of erection pieces, related configuration of erection piece and band metal fittings, shape of band metal fittings, installation mode, number, joining plate of band metal fittings on band metal fittings It goes without saying that appropriate configurations can be adopted for the configuration related to the splice plate, the shape of the splice plate, the number of bolt holes between these members, and further, steel pipes for truss frames of building structures and tower structures. The present invention is not limited to steel columns, but can also be used for welding various other joints in the field.

[0011]

As described in detail above, according to the present invention, a relatively small number of erection pieces can be fixed to the outer peripheral surface of a steel frame member such as a steel pipe by welding or the like. Since it is possible to securely and removably attach a band metal object in which a joining plate having a larger number of joining plates than the erection piece to the piece is securely attached to the outer peripheral surface of the steel pipe or the like, a large number of these joining plates are used. By attaching the splice plate, it is possible to accurately temporarily connect the steel frame members such as steel pipes, which are the members to be connected vertically, as a pipe having a single core without shaking the shaft center. Therefore,
By welding the joints of the upper and lower pipes whose axes are accurately aligned and temporarily connected to each other, it is possible to obtain a highly accurate and high-quality connected body of steel members such as long steel pipes in the field. Moreover, despite the fact that a large number of splice plates are used for connection with high axial accuracy, a relatively small number of erection pieces (minimum 2 pieces each at the top and bottom) after the completion of the connection body is constructed of steel pipes or other steel frames. Just cut and remove it from the member,
Work including polishing of the remaining portion of the erection piece can be performed easily in a short time. Moreover, since the band metal fittings can be used repeatedly after being removed from the erection piece together with the splice plate,
On-site welding can be performed without waste and at low cost.
Further, the band hardware is configured to be removably attached to the erection piece, and by preparing several types of band hardware, the number and shape of the joining plates are appropriately selected according to the purpose of use,
Various forms of temporary connection are obtained.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of the vicinity of a joint portion when upper and lower pipes, which are steel frame members such as steel pipes, are temporarily connected by a band metal fitting according to an embodiment of the present invention.

FIG. 2 is a side view applied to a belly member in a roof truss frame of a building structure according to one embodiment of the present invention.

FIG. 3 is a diagram in which an erection piece is fixed to an upper pipe according to the embodiment of the present invention.

FIG. 4 is a diagram showing a band metal object on which a joining plate is provided in a projecting manner according to one embodiment of the present invention.

FIG. 5 is an enlarged view of a partial cross section and a main part to which a band metal fitting is attached according to an embodiment of the present invention.

FIG. 6 is a diagram showing a state in which temporary connection of the upper and lower pipes is completed according to the embodiment of the present invention.

FIG. 7 is a view showing the vicinity of a joint portion of a conventional temporary connection method for welding a steel pipe or the like in a tower-like structure on site.

FIG. 8 is an enlarged view showing the vicinity of a joint portion of a conventional temporary connection method.

[Explanation of symbols]

 1 ... Pipe (steel frame member such as steel pipe) 1A ... Upper pipe 1B ... Lower pipe 2 ... Erection piece 2H ... Bolt hole 3 ... Band metal fitting 3F ... Mounting flange 4 ...・ Joint plate 5 ・ ・ ・ Splice plate 6 ・ ・ ・ Joint part

Claims (3)

[Claims] 1. A plurality of erection pieces are fixed to the outer periphery of the upper and lower divided steel pipe and other steel frame members in the vicinity of respective joints,
A band metal object having a larger number of joining plates protruding from the erection pieces is attached to these erection pieces, and upper and lower parts of the joining plates that are opposed to each other are temporarily connected by a splice plate to weld and join the joint portions. On-site welding method using band metal fittings. 2. The on-site welding method using a band metal fitting according to claim 1, wherein the erection pieces are arranged to face each other only in one diametrical direction of at least one steel frame member such as a steel pipe. 3. The band metal fitting is composed of two semi-circular arc-shaped bodies, each of which is provided with two joining plates protruding from each other and arranged to face each other in the diametrical direction of the steel frame member such as a steel pipe. In-situ welding method using the band hardware described.