JP2014024092A - Welding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a welding method by which weld metals are formed inside the corners of a box-shaped cross-section steel sheets by designing a groove shape and difference does not arise between the corners of a rectangular steel tube constituting a beam-column joint and the corners of the box-shaped cross-section steel tube arranged between the corners of a rectangular steel tube, and consequently simple welding process is achieved and work efficiency is improved.SOLUTION: A corner welding method is provided in which four rectangular steel sheets 1 are combined into a box shape and lateral edges of respective steel sheets are welded together to form a steel tube 21 having four plane-combined box-shape cross sections of a beam-column joint. In the method, the steel sheets 1 having grooves formed on both lateral edges are each longitudinally arranged to cause the lateral edges of the respective steel sheets 1 to be adjacent to each other, welding torches are respectively arranged on joints between the lateral edges adjacent to each other, of the respective steel sheets, and the welding torches 10a are moved upward from below, so that electroslag welding or electrogas welding of all the corners of the respective steel sheets are performed at the same time.

Description

  The present invention relates to a welding method applied at the time of forming a corner portion of a column beam joint, for example, in a steel column, and more particularly to a method of welding a corner portion forming a four-sided assembly box cross section for use in a column beam joint portion. About.

  Conventionally, semi-automatic welding, submerged arc welding, electrogas arc welding, and the like are applied to the welding of steel columns. By such welding, a steel column using an inner diaphragm, a through diaphragm, an outer diaphragm and the like is formed.

  A column joint for connecting a beam is formed on the steel column. Conventionally, many welding processes are applied to form the column joint.

  An example of the prior art will be described with reference to FIGS. 27 and 28. FIG.

  FIG. 27 shows an arrangement of parts before welding of a steel column using a through diaphragm. As shown in FIG. 27, in the conventional example, in order to join the upper rectangular steel pipe 202 and the lower rectangular steel pipe 203 to each other, a through diaphragm 201 is disposed between the upper rectangular steel pipe 202 and the lower rectangular steel pipe 203.

  FIG. 28 shows a steel column using a through diaphragm 201, an upper square steel pipe 202, and lower square steel pipes 203 and 204.

  When such a through-diaphragm 201 is used, it is necessary to weld the upper square steel pipe 202 and the diaphragm 201, the diaphragm 201 and the lower square steel pipe 203, and the through-diaphragm 201 and the lower square steel pipe 204. It was necessary to work by applying the welding process.

  In addition, in the conventional column beam joining technique, it is proposed that the force from the beam is efficiently transmitted to the column without providing a diaphragm to reduce welding (for example, see Patent Document 1). .

JP 2003-28761 A

  There has been a problem of how to obtain a corner welding technique for a beam joint that can form a beam joint by applying a small number of welding processes to the conventional column beam joining technique.

  Further, in the prior art, as shown in FIG. 26, a box shape having a corner portion of the lower square steel pipe 102 and the upper square steel pipe 103 constituting the column beam joint portion 101, and a round portion disposed therebetween. A staggered portion 108 may occur between the corners of the cross-section steel pipe 104. If a non-welded portion is generated by the staggered portion 108, the column strength is affected. Therefore, an extra process such as arranging an auxiliary plate or the like inside the corner portions of the square steel pipes 102 and 103 and reinforcing welding is required. There are problems such as a decrease in work efficiency.

  The present invention has been made in consideration of the above-mentioned circumstances. The corner of the rectangular steel pipe constituting the column beam joint is formed by devising the groove shape and forming a weld metal inside the corner of the box-shaped cross-section steel plate. To provide a welding method in which a staggered portion does not occur between a portion and a corner portion of a box-shaped cross-section steel pipe disposed therebetween, welding processing is simple and work efficiency can be improved. Objective.

  Another object of the present invention is to prevent the occurrence of staggered portions by increasing the thickness of the box-shaped cross-section steel pipe even when the plate thickness of the upper and lower rectangular steel pipes engaged with the box-shaped cross-section steel pipe is different. It is in providing the welding method which can absorb the difference in plate | board thickness.

  Furthermore, another object of the present invention is to eliminate the diaphragm through the column beam joint where the beam flange is engaged by increasing the thickness of the box-shaped cross-section steel tube compared to the thickness of the square steel tube which is vertically aligned. It is in providing the welding method which can do.

  In order to solve the above problems, in the present invention, four rectangular steel plates are combined into a box shape, and the side edges of each steel plate are welded to each other, so that the four-sided assembly box of the column beam joint in steel structure is obtained. A method of welding corner portions to form a square steel pipe having a cross section, wherein the steel plates having grooves formed on both side edges are arranged vertically and the side edges are adjacent to each other. A welding method characterized in that welding torches are respectively arranged between adjacent side edges, and these welding torches are moved from below to above and all corners are electroslag welded or electroslag gas arc welded simultaneously. I will provide a.

  According to the present invention, the weld metal is formed inside the corner of the box-shaped cross-section steel plate, and between the corner of the square steel pipe constituting the column beam joint and the corner of the box-shaped cross-section steel pipe disposed therebetween. In this way, there is no staggered portion, welding is simplified, and work efficiency can be improved.

  Also, when carrying out welding, place the welding line as much as possible in the corners, and form a weld metal on the inner side of the corners of the box-shaped cross-section steel plate, so that the box-shaped cross section with the round steel pipes in the upper and lower parts In the joint portion of the steel pipe, it is possible to prevent the gap that has occurred in the past, and it is possible to prevent the gap of the butt joint with respect to the rounded portion of the square steel pipe and the box-shaped cross-section steel pipe.

  Also, when the plate thickness of the upper and lower rectangular steel pipes engaged with the box-shaped cross-section steel pipe is different, the difference in the plate thickness can be absorbed by increasing the thickness of the box-shaped cross-section steel pipe.

  Also, at the column beam joint, the thickness of the box-shaped cross-section steel pipe is increased (increased) compared to the thickness of the square steel pipe that fits vertically, so that the diaphragm is omitted from the beam flange joint. Can do.

  Also, in the column beam joint welding method of a box-shaped cross-section steel pipe that joins a plurality of steel plates by welding to form a hollow box-shaped column beam joint, particularly in the welding method by electroslag welding, the inside of the corner By devising the groove shape that forms the weld metal, the weld line can be arranged at the corner as much as possible, thereby preventing the discrepancy.

  That is, according to the present invention, a square diaphragm is interposed using a conventional square steel pipe, whereas a square steel pipe is placed up and down without using a through diaphragm, and a corner portion is inserted into a box steel pipe between them. It is possible to prevent a discrepancy from occurring.

  And conventionally, many welding processes are applied to the formation of the column beam joint, whereas in the present invention, the welding process for forming the column joint can be reduced. A welding method for welding a corner portion of a column beam joint is provided.

Explanatory drawing which shows the welding installation which implements the welding method by 1st Embodiment of this invention, a welding target object, etc. FIG. Explanatory drawing which expands part A of FIG. 1 and shows a welding state. The top view of the specific example which shows the welding state of the steel plate by 1st Embodiment. The enlarged view which shows the C section of FIG. (A) is a top view which shows the groove part of a steel plate, (b) is the top view which made the steel plate the welding arrangement | positioning. The top view which shows the arrangement configuration at the time of the welding of the steel plate by 2nd Embodiment of this invention. The side view of FIG. The top view which shows the arrangement configuration at the time of the welding of the steel plate by the said 2nd Embodiment. The top view which shows the welding state of the steel plate shown in FIG. The enlarged view of the welding part shown in FIG. The sectional side view which shows the state which connected the some column beam joint part element by the said 2nd Embodiment up and down. Explanatory drawing of the welding installation which implements the welding method by 3rd Embodiment of this invention, and a box-shaped cross-section steel plate. The perspective view which shows the welding state of the box-shaped cross-section steel plate implemented using the welding equipment of FIG. The top view of the box-shaped cross-section steel plate manufactured by 3rd Embodiment. The partial expanded view of the box-shaped cross-section steel plate shown in FIG. The top view which shows 4th Embodiment of this invention. The top view which shows 5th Embodiment of this invention. The top view which shows 6th Embodiment of this invention. The top view which shows 7th Embodiment of this invention. The side view of the structure shown in FIG. The elements on larger scale of the structure shown in FIG. The perspective view which shows the structure shown in FIG. The top view which shows the steel plate arrangement | positioning structure for describing 8th Embodiment of this invention. The side view of FIG. The assembly drawing which shows 9th Embodiment of this invention. The expanded plan view which shows the welding part by 9th Embodiment of this invention. The perspective view which shows the components for demonstrating a prior art example. The perspective view for demonstrating the structure by a prior art example.

  Hereinafter, an embodiment of a welding method according to the present invention will be described with reference to FIGS.

First Embodiment (FIGS. 1 to 5)
FIG. 1 shows, as a first embodiment of the present invention, a welding equipment and a welded object for carrying out a welding method for a corner portion forming a box-shaped steel pipe having a rectangular assembly box-shaped section of a column beam joint in a steel column. FIG. 2 is an enlarged cross-sectional view showing the tip of the welding torch 10a (10b, 10c, 10d) shown in FIG.

  As shown in FIG. 1, in this embodiment, four rectangular steel plates 1 (1a, 1b, 1c, 1d) for constituting column beam joints are provided as the workpieces. These steel plates 1 (1a, 1b, 1c, 1d) are vertically arranged in combination in a four-sided assembly box shape, and lower end corners are respectively mounted on a support plate 8 as a start tab, and each steel plate 1a, 1b, 1c, Grooves 4,... Each having a 45 degree inclination are formed on both side edges in the width direction of 1d.

  Further, the welding equipment 10 includes four sets of welding wires 2a, 2b, 2c, and 2d. These welding wires 2a, 2b, 2c, and 2d are, for example, bag-like storage devices 3a, 3b, The storage devices 3a, 3b, 3c, 3d are supported on the support plate 3e by two sets.

  In each of the storage devices 3a, 3b, 3c, 3d, the guide rollers 5,... For wire drawing and the welding wires 2a, 2b, 2c, 2d fed by the respective guide rollers 5,. And guide tubes 6,. And four sets of welding wires 2a, 2b, 2c, 2d are configured to be simultaneously pulled up by motor-driven feed rollers 7b,... By motors 7a,.

  FIG. 2 is an enlarged perspective view showing a portion of the groove 4 where the welding torch 10a of the welding equipment 10 shown in FIG. 1 is arranged. As shown in FIG. 2, a start tab 8a is disposed at the lower end portion of the steel plate 1 (1a, 1b, 1c, 1d) which is a welded portion, and an end tab 8b is disposed at the upper end portion. The welding torch 10a is set to perform welding while moving upward from the lower end of the welded portion with the front end of the welding torch 10a vertically downward. That is, the four sets of welding wires 2a, 2b, 2c, 2d are simultaneously raised, and overlay welding is performed while moving upward from the lower end of the welded portion with the tip of the welding torch 10a vertically downward. It is.

  Thus, in this embodiment, the four steel plates 1 (1a, 1b, 1c, 1d) having the grooves 4 formed on the side edges parallel to each other are arranged in a box shape, and the adjacent steel plates are opened. A welding torch 10a is disposed between the tips 4, and the four steel plates 1 (1a, 1b, 1c, 1d) are welded simultaneously.

  That is, four steel plates 1 (1a, 1b, 1c, 1d) are arranged in a box shape so as to be opposed to each other by forming inclined grooves 4 inclined at 45 degrees on their respective edge portions. A groove 4 made of an inclined surface (tapered surface) is formed at adjacent edge portions of each of the steel plates 1a, 1b, 1c, 1d arranged in the plate, and the steel plates 1a, 1b, 1c, 1d adjacent to each other are opened. The gap between the tips 4 is kept constant, welding torches 10a are arranged between the grooves 4, and the welding wires (melting materials) 2a, 2b, 2c, 2d are electroslag as shown in FIG. Welding or electroslag / gas arc welding is performed, and all the steel plates 1a, 1b, 1c, and 1d are simultaneously welded from the lower end side toward the upper end side.

  FIG. 3 is a plan view of a welded state of the steel plate material 28 showing a specific example of the present embodiment, and FIG. 4 is an enlarged view of a portion C in FIG.

  As shown in FIG. 3 and FIG. 4, in this embodiment, the four steel plate members 28,. For example, a groove 27 having an inclination of 45 degrees is formed at the edge portions of the steel plate materials 28,..., And the edge portions of the steel plate materials 28 are made of the above-described welding wires 2a, 2b, 2c, 2d. These are combined as a box-shaped cross-section steel pipe 21 joined to form a welded portion 12. And the groove | channel 27 of the opposing edge part of each steel plate material 28 and ... is inclined and set to 45 degree | times with respect to the plate surface of the steel plate material 28, respectively, and the edge part (opposing surface) space | interval of the groove | channel 27 is set. The box-shaped cross-section steel pipe 21 that constitutes the column beam joint is formed by fixing the parallel surfaces of the welds 12 to each other and welding them to each other.

  A method for producing the box-shaped steel pipe 21 will be described with reference to FIGS.

  FIG. 5 (a) is a plan view showing a state in which one steel plate material 28 is set up vertically, and FIG. 5 (b) is a plan view showing a state in which four steel plate materials 28 are installed facing each other with a gap. It is.

  As shown in FIG. 5A, both side edges of the steel plate material 28 are processed with a groove 27 having an inclination of 45 degrees with respect to the plate surface to form a trapezoidal cross section.

  And as shown in FIG.5 (b), each steel plate material 28 of 4 sheets is made into the box-shaped cross-sectional arrangement | positioning by making it face in two directions orthogonal to each other in the vertical direction, and the side edge 27 of each steel plate material 28 adjacent to each other. A certain gap S2 (for example, 25 mm) is provided between them.

  In this state, the edge portions of the steel plates 28 are welded using the welding equipment 10 of FIG. 1, and the box-shaped cross section in which each corner portion becomes the welded portion 12 of the inclined surface as shown in FIG. A steel pipe 21 is configured.

  According to such this embodiment, as shown in FIG. 4, a staggered portion is formed between the box-shaped steel pipe d-corner portion constituting the column beam joint and the box-shaped cross-section steel tube corner portion disposed therebetween. Is not generated, processing is simplified, and work efficiency can be improved.

Second Embodiment (FIGS. 6 to 11)
FIG. 6 is a plan view showing a welding object according to the second embodiment of the present invention as an arrangement during welding, and FIG. 7 is a side view of FIG.

  As shown in FIG. 6 and FIG. 7, the welding object of this embodiment is, for example, four vertically long rectangular steel plates 1 (1a, 1b, 1c, 1d) having the same shape and the same size, each in the longitudinal direction. An inclined groove 9 is formed on both side edges along which the outer corner portion gradually becomes narrower. These grooves 9 are inclined surfaces of 45 degrees or less, for example, 30-degree inclined surfaces (grooves 9 and 9), and these steel plates 1a, 1b, 1c and 1d are arranged in a box-shaped cross-sectional shape. Using the welding equipment 10 shown in 1, all corners are welded simultaneously.

  In this manner, the grooves 9 having an inclination of, for example, 30 degrees toward the inside are formed on the adjacent edges of the steel plates 1a, 1b, 1c, and 1d, and the steel plates 1a, 1b, 1c, and 1d are formed. As a setting in which the gap between the opposite edge portions gradually expands inward, the steel plates 1a, 1b, 1c, 1d are simultaneously welded from below to above in the state shown in FIG. In addition, the thickness of each steel plate 1a, 1b, 1c, 1d is 16-40 mm, for example, 32 mm, and the groove | channel 9 formed between the mutually adjacent outer side edge parts of these steel plates 1a, 1b, 1c, 1d. The gaps between the outer end portions are set as gaps S1 of 5 to 12 mm, respectively (note that the dimension of the gap “S1” shown in FIG. 6 is broadly illustrated to make the gap easy to see).

  FIG. 8 shows the dimensional relationship during assembly of the four steel plates 1a, 1b, 1c, and 1d. As shown in FIG. 8, the groove angle θ is, for example, 30 degrees, the inner and outer dimensions l of the grooves 9, 9 inclined at 30 degrees are set to, for example, 59 mm, and the gap width c on the outer peripheral side of the groove portion. Is set to 8 mm, for example.

  9 shows the welded state (and the state after welding) of the steel plates 1a, 1b, 1c, and 1d shown in FIG. 8, and FIG. 10 shows the welded portion 12 in an enlarged manner.

  As shown in FIG. 9 and FIG. 10, at the time of welding, a closing material 11; 11a, 11b made of flux packing or a steel plate is arranged at the joint end of each of the square steel plates 1a, 1b, 1c, 1d, and the steel plates 1a, 11b, Welding is performed from the inside of 1b, 1c, and 1d. By welding from the inside, the welded portion 12 is welded toward the inside of the box-shaped cross section so that the weld metal swells inward, and a high-strength weld structure is obtained.

  According to such a structure of the box-shaped cross-section column, for example, as shown in FIG. 10, the rectangular steel plates 1 a and 1 b are joined to the integral hollow column (box-shaped cross-section steel pipe indicated by the phantom line d) having a rounded shape. In this case, inclined grooves 9 and 9 are formed in parallel edge portions of the rectangular steel plates 1a and 1b, and the grooves that intersect the parallel edge portions of the rectangular steel plates 1a and 1b at a substantially right angle. 9 and 9 are arranged in a box shape, so that a staggered portion is formed between the corner of the square steel pipe 21 constituting the column beam joint and the corner of the box-shaped cross-section steel pipe d arranged therebetween. It is possible to perform welding without causing a problem, the processing becomes simple, and the work efficiency can be improved.

  Moreover, when performing the welding method by electroslag welding, the discrepancy which generate | occur | produced conventionally can be prevented by arrange | positioning a weld line in a corner | angular part as much as possible, and forming a weld metal inside a corner | angular part.

  In the present embodiment, the inclined grooves 9 and 9 at the ends of the steel plates 1a, 1b, 1c and 1d are brought close to each other to form a box shape, and the grooves 9 and 9 are formed so as to face each other. The angle of the tip 9 is set as an inclined surface of, for example, 30 degrees, and the grooves 9 and 9 are parallel to each other. As shown in an enlarged view (FIG. 10), one corner of the four-sided assembly box section steel pipe indicated by the phantom line d is an electroslag welded portion at the inner corner of the four-surface assembly box section d of this embodiment. Twelve weld metals are remarkably exposed to the inner portion 12a, and the right angle shape of the inner angle is lost.

  That is, the inner corner metal portion that is exposed inward is configured to be exposed inward, and in the state where the corner portion is connected to the rounded box column d, the electrowelded portion 12 of the inner corner portion is present. Therefore, unlike the conventional example described above, the corner portion of the rounded box column d connected to the upper and lower sides does not cause the staggered portion 108 shown in FIG.

  Therefore, there is no staggered portion between the corner of the box-shaped cross-section steel pipe d constituting the column beam joint and the corner of the square steel pipe 21 arranged therebetween, the processing is simplified, and the work Efficiency can be improved.

  Moreover, when performing the welding method by electroslag welding, the welding line | wire can be arrange | positioned in a corner | angular part as much as possible, and the discrepancy which generate | occur | produced conventionally can be prevented by forming a weld metal inside a corner | angular part. .

  FIG. 11 shows a connecting portion of the column beam joint portion 13 configured by the above-described method. This column beam joint portion 13 has the above-described four-sided assembly box cross-sectional structure, and the joint portions of the upper and lower steel columns 14, 15, 16 are joined by welding. And it shows as the structure which connected the beam 17 and the lower surface board 18 of this column beam joint part 13. FIG.

  In this configuration, a staggered portion does not occur between the corners of the box-shaped cross-section steel pipes 14 and 16 constituting the column beam joint 13 and the corners of the square steel pipe 15 disposed therebetween, and the processing is performed. It becomes simple and work efficiency can be improved.

  According to the above embodiment, for the welding method by electroslag welding, devising the groove shape of the method of arranging the weld line at the corner as much as possible, thereby forming the weld metal inside the corner, A discrepancy can be prevented.

  That is, as shown in FIG. 10, it is possible to prevent the butt joint between the box-shaped cross-section steel pipe 21 and the square steel pipe d having a rounded shape from colliding with the rounded portion of the square steel pipe d.

  Further, even when the plate thickness of the upper and lower rectangular steel pipes engaged with the box-shaped cross-section steel pipe 21 is different, the difference in the plate thickness can be absorbed by increasing (thickening) the plate thickness of the box-shaped cross-section steel pipe 21. .

  Furthermore, in the column beam joint portion 13 shown in FIG. 11, the plate thickness of the box-shaped cross-section steel pipe 15 (21) is made thicker (increased) than the plate thickness of the square steel pipes 14 and 16 that are vertically engaged with each other, The diaphragm can be omitted from the joint portion of the beam flange.

[Third Embodiment] (FIGS. 12 to 15)
A third embodiment of the present invention will be described with reference to FIGS.

  FIG. 12 is an explanatory view of the welding equipment 10A and the box-shaped cross-section steel plate 21A used for carrying out the method of welding the corner of the box-shaped cross-section steel plate 21A according to the third embodiment of the present invention, and FIG. 13 applies the welding equipment 10A. It is a perspective view of the welding state of the box-shaped cross-section steel plate 21A manufactured in this way.

  The welding equipment 10A shown in FIG. 12 is applied to submerged arc welding called submerged arc welding and consumable electrode type gas shielded arc welding. In the gas shielded arc welding, the welding equipment 10A uses the welding machine 40 and the wire feeding device 41 to convert the electrode wire as the welding wire 45 from the welding torch 43 under the welding conditions of required current, voltage, and speed to the steel plate 1 (1a , 1b, 1c, 1d), an arc is generated between the base material and the electrode wire 45, and the electrode wire 45 is fed and welded in the welding direction A in accordance with the melting speed of the wire. .

  In the case of submerged arc welding, as shown in FIG. 13, the electrode wire 45a is fed into the dispersed granular flux 44, and a plurality of, for example, two electrode wires (welding wires) 45a are parallel to the welding direction A. An arrayed tandem multi-electrode welding process is used. In the tandem method, there are few blowholes and a metallurgically excellent weld metal can be obtained. The steel plate 1 constituting the box-shaped cross-section steel plate 21A uses a steel material for building structure (SN material) or a steel material for welded structure (SM material) defined by JISG3136 in high-tensile steel, and welds high-tensile steel. In this case, wires defined in JISZ3312 and 3183 are used as the electrode wires 45 and 45a. Using this wire, the flux 44 specified in JISZ3183 is used in combination with a welding wire (electrode wire) 45a, so that the arc can be stabilized and the quality of the molten metal can be improved by chemical metallurgical reaction with the molten metal. It is possible to improve the molten metal with the necessary properties and welding characteristics, and to form a stable and smooth weld bead surface. The remaining flux 44 is collected and reused by an aspirator (not shown).

  In FIG. 12, reference numeral 47 denotes a gas cylinder, which stores carbon dioxide gas 100%, a small amount of argon or helium, or a shielding gas containing an active gas such as carbon dioxide in an inert gas. Used when performing gas shielded arc welding.

  In FIG. 14, the box-shaped cross-section steel pipe 21 </ b> A having a rectangular cross-sectional shape manufactured in the present embodiment is formed outside the backing metal 32 by arranging a rectangular backing metal 32 inside the corner portion 29. The inclined grooves 27a and 27a are welded as the welded portion 26. The box-shaped cross-section steel pipe 21 </ b> A includes four vertically long steel plates 28 (28 a to 28 d), and among these steel plates 28, a pair of wide steel plates 28 a and 28 c opposed to each other, and between the facing surfaces thereof. A pair of narrow steel plates 28b and 28d combined in an orthogonal arrangement are combined in a box shape.

  Each steel plate material 28 (28a to 28d) is arranged in a box-like box shape, and a rectangular backing metal 32 is arranged on the inner surface portion of the corner corner portion, and the backing metal 32 faces the corner portion of the steel plate material 28. The opposite parts of the corners to be cut are cut out as necessary. The inclined grooves 27a and 27a of each steel sheet 28 are formed on inclined surfaces that expand outward, and the groove angle θ is configured to be 30 ° to 60 °, and the welding shown in FIG. Using the equipment 10A, the inclined grooves 27a and 27a formed on each steel plate material 28 are welded by submerged arc welding or gas shielded arc welding, thereby forming a box-shaped cross-section steel plate 21A shown in FIG.

As shown in FIG. 14, the box-shaped cross-section steel plate 21 </ b> A is configured to have a rectangular shape with one side of 200 mm to 400 mm, for example, and the thickness T of each steel plate material 28 is configured to 20 mm to 60 mm. Groove 27a formed in the steel plate 28 (28 a to 28 c) of the box-shaped cross section steel 21A, the root gap _{S 2} of 27a is 0 to 10 mm, notch the backing metal 32, the groove 27a of each steel sheet 28 configured to considerable amount corresponding to the root gap _{S 2} of 27a.

  Also in this embodiment, a staggered portion is produced between the corner of the box-shaped cross-section steel pipe d constituting the column beam joint and the corner 29 of the box-shaped cross-section steel pipe 21A disposed therebetween. There is no problem, the processing becomes simple, and the work efficiency can be improved.

  In the joint portion between the box-shaped cross-section steel pipe 21A and the square steel pipe d having a round shape, it is possible to prevent the butt joints from being misaligned with the round portion of the square steel pipe d.

  Further, even when the plate thicknesses of the upper and lower rectangular steel pipes d engaged with the box-shaped cross-section steel pipe 21A are different, the difference in the plate thickness can be absorbed by increasing the thickness of the box-shaped cross-section steel pipe 21A. it can.

  Further, the thickness of the box-shaped cross-section steel pipe 21A is increased (increased) compared to the thickness of the square steel pipe d that meets the top and bottom at the column beam joint, so that the diaphragm is omitted from the beam flange joint. can do.

[Fourth Embodiment] (FIG. 16)
FIG. 16 is a plan view showing a state during welding according to the fourth embodiment of the present invention.

  In this embodiment, unlike the inclined grooves 9 and 9 shown in the first embodiment and the second embodiment, the box-shaped steel pipe 21 having a rectangular cross section is formed by the grooves 19 and 19 forming the corners. A rectangular backing metal 23 is arranged on the inner surface side of the corner 22 or a part or all of the corners 22 of the box-shaped cross-section steel pipe 21, and the groove 19 formed on the outer side of the backing metal 23, 19 is configured to be welded as the welded portion 24.

  Specifically, as shown in FIG. 16, four vertically long steel plate materials 28,... Constituting the box-shaped cross-section steel pipe 21 are provided, and among these steel plate materials 28,. The steel plate materials 28 and 28 and a pair of narrow steel plate materials 28 and 28 that are combined in an orthogonal arrangement between the opposed surfaces are arranged in a box shape in a vertical arrangement.

  And in the state arrange | positioned in box shape, the backing metal 23 is each arrange | positioned to the inner surface part of the corner part of each steel plate material 28, ..., and the rectangular box is used using the welding equipment 10 shown in FIG. A groove 23 formed on the outer side of the backing metal 23 is arranged on the inner surface side of the corner of the shaped cross-section steel pipe 21 or on the inside of a part or all of the corners 22 of the box-shaped steel pipe 21. 19 and 19 are welded.

  For other configurations and methods, refer to the first embodiment, and redundant description will be omitted.

  Even in this embodiment, a staggered portion is generated between the corner of the box-shaped cross-section steel pipe d constituting the column beam joint portion 13 and the corner of the box-shaped cross-section steel pipe 21 arranged therebetween. There is no problem, the processing becomes simple, and the work efficiency can be improved.

  And about the welding method by electroslag welding, it is possible to surely prevent the discrepancy by forming the weld line as deep as possible inside the corner portion and sufficiently forming the weld metal inside the corner portion. become.

  That is, it is possible to prevent a butt joint between the box-shaped cross-section steel pipe 21 and the square steel pipe d having a round shape from colliding with the round portion of the square steel pipe d.

  Further, even when the plate thicknesses of the upper and lower rectangular steel pipes d engaged with the box-shaped cross-section steel pipe 21 are different, the plate thickness of the box-shaped cross-section steel pipe 21 is increased (increased) to absorb the difference in the plate thickness. it can.

  Further, the thickness of the box-shaped cross-section steel pipe 21 in the column beam joint is increased (increased) compared to the thickness of the square steel pipe d that is vertically joined, so that the diaphragm is omitted from the beam flange joint. can do.

[Fifth Embodiment] (FIG. 17)
FIG. 17 is a plan view showing a state during welding according to the fifth embodiment of the present invention.

  In the present embodiment, the structure of the backing metal 23 is different from that of the third embodiment. That is, the concave portion 25 of the backing metal 23 facing the inner corner of each corner 22 is provided with a backing metal 23 having an L-shaped cross section inside the welded portion 24 of each corner 22 in the rectangular box-shaped steel pipe 21. The box-shaped cross-section steel pipe 21 is attached and fixed so as to face the outside of the corner, and a concave portion 25 is formed on the surface side of the box-shaped cross-section steel pipe 21 of the backing metal 23.

  And the welding part 24 is formed in the box-shaped cross-section steel pipe 21 including the recessed part 25 of this backing metal 23 over a fixed depth.

  For other configurations and methods, refer to the first embodiment, and redundant description will be omitted.

  Even in this embodiment, a staggered portion is generated between the corner of the box-shaped cross-section steel pipe 21 constituting the column beam joint and the corner of the box-shaped cross-section steel pipe 21 arranged therebetween. There is no problem, the processing becomes simple, and the work efficiency can be improved.

[Sixth Embodiment] (FIG. 18)
FIG. 18 is a plan view showing a corner portion welding method for the box-shaped cross-section steel pipe 21 according to the sixth embodiment of the present invention.

  As shown in FIG. 18, in this embodiment, four steel plate materials 28,... Are arranged to face each other as a box-shaped cross-sectional structure, and a contact plate 30 is arranged inside each corner portion of these steel plate materials 28,. To do. And the welding torch 10a shown in FIG. 1 is arrange | positioned in the outer surface opening part of the radial direction outer side formed with each steel plate material 28 and this plate 30, and the steel plate materials 28 are welded by the welding part 26. FIG.

  In this way, the inclined groove 27 is formed at the edge of the steel plate material 28, and the edge portions of these steel plate materials 28 are joined together to form a box-shaped cross-section steel pipe 21. And the inclined groove 27 of each opposing edge is set to 45 degrees with respect to the plate surface of the box-shaped cross-section steel pipe 21, and the plate surface interval of the groove 27 inclined 45 degrees is set as a parallel plane, The box-shaped cross-section steel pipe 21 is formed by welding each other.

  Also according to this embodiment, a staggered portion is generated between the corner of the box-shaped cross-section steel pipe d constituting the column beam joint and the corner of the box-shaped cross-section steel pipe 21 arranged therebetween. There is no problem, the processing becomes simple, and the work efficiency can be improved.

[Seventh Embodiment] (FIGS. 19 to 22)
FIG. 19 is a plan view showing a welding facility for carrying out a corner welding method for a box-shaped cross-section steel pipe 21 using a water-cooled copper plate according to a seventh embodiment of the present invention, and FIG. 20 is a side view of FIG. . FIG. 21 is a perspective view of a welding facility using a water-cooled copper plate, and FIG. 22 is a plan view of FIG.

  In this embodiment, first, as shown in FIGS. 19 and 20, four vertically long steel plates 1 (1a, 1b, 1c, 1d) face each other in a four-sided box shape (arranged in a rectangular box column shape).

  Then, a water-cooled copper plate 31 having an L-shaped cross section is formed in a concave shape between both sides outside the corners of the edges (both end edges) along the plate width direction of the four steel plates 1 (1a, 1b, 1c, 1d). Install it vertically with the corners facing each other.

  In this case, as shown in FIG. 21 and FIG. 22, the water-cooled copper plate 31 forms a corner portion of a vertically long and hollow structure between the concave corner portions of the steel plate 1 (1a, 1b, 1c, 1d). A rounded portion having a constant diameter is formed on the concave side surface of the letter shape.

  On the other hand, in each pair of outer space portions of the inner corners of the steel plate facing each water-cooled copper plate 31, a backing metal 32 covering the outside of this portion is disposed, and a gap G is formed between the corner portions. State.

  In this state, the water-cooled copper plate 31 is disposed so as to cover the gaps between the adjacent steel plates 1a, 1b, 1c, and 1d from the outside, and all corners are applied by applying the welding equipment 10 shown in FIG. The welded portion 35 is configured by simultaneously welding the portions from the lower end side toward the upper end side.

  Also according to the present embodiment, a staggered portion may occur between the corner of the box-shaped cross-section steel pipe 21 (d) constituting the column beam joint and the corner of the square-section steel pipe 21 disposed therebetween. Therefore, processing is simplified and work efficiency can be improved.

[Eighth Embodiment] (FIGS. 23 and 24)
FIG. 23 is a plan view for explaining a welding method for carrying out corner welding of the box-shaped cross-section steel pipe 21 according to the eighth embodiment of the present invention, and FIG. 24 is a side view of FIG.

  As shown in FIGS. 23 and 24, in the corner portion welding method of the present embodiment, as a means for configuring the peripheral wall of the box-shaped cross-section steel pipe 21, peripheral members that configure the outer wall of the box-shaped cross-section steel pipe 21 As a set of four steel plates 1 (1a, 1b, 1c, 1d) and the steel plates 1 (1a, 1b, 1c, 1d) arranged inside these are supported from the inside of the column to ensure rigidity. A vertically long central member 33 assembled in a cross shape (cross shape) in plan view is applied.

  That is, the backing metal 23 is provided on the opposing surfaces of the steel plates 1a and 1c facing each other in one direction among the peripherally arranged steel plates 1 (1a, 1b, 1c, 1d).

  Further, backing metal 24 is also provided on the opposing surfaces of the steel plates 1b and 1d facing each other in the direction orthogonal to the opposing surfaces of the steel plates 1a and 1c.

  Thus, in this embodiment, as shown in FIG. 23 and FIG. 24, the peripheral members constituting the column outer wall have a pair of wide steel plates 1a with the backing metal 23 in the vicinity of both ends of the surfaces facing each other. , 1c and a pair of narrow steel plates 1b, 1d provided in an arrangement perpendicular to these, form a box-shaped column (box-shaped cross-section steel pipe 21).

  The steel plates 1a and 1c and the steel plates 1b and 1d facing each other constitute a column outer wall, and a vertically long central member 33 assembled in a cross shape (cross shape) in a plan view is disposed inside the column. The structure which supports the steel plates 1a and 1c and the steel plates 1b and 1d which oppose the central member 33 in two vertical and horizontal directions from the inside is applied.

  In addition, about the shape, dimension, etc. of each steel plate 1 (1a, 1b, 1c, 1d), it is possible to select variously. That is, the steel plates 1a and 1c and the steel plates 1b and 1d facing each other constitute a column outer wall, and a longitudinally long central member 33 assembled in a cross shape (cross shape) in plan view is disposed inside the column. The steel plates 1a and 1c and the steel plates 1b and 1d that face the central member 33 in two vertical and horizontal directions can be supported from the inside.

  According to the method of this embodiment, the steel plates 1a, 1b, 1c, 1d can be held and fixed from the inside, and welding can be advanced by applying the same method as that of the sixth embodiment to the outside. In addition, there is no staggered portion between the corner of the box-shaped cross-section steel pipe 21 constituting the column beam joint and the corner of the square steel pipe disposed between them, the processing becomes simple and the work efficiency is improved. Can be improved.

[Ninth Embodiment] (FIGS. 25 and 26)
FIG. 25 is a perspective view showing components of a column beam joint portion of a steel column according to the ninth embodiment. As shown in FIG. 25, in the column beam joint portion 101 according to the ninth embodiment, a box-shaped cross-section steel pipe 104 is disposed between a lower square steel pipe 102 and an upper square steel pipe 103, and these are assembled vertically. It is comprised by welding to.

  FIG. 26 is a cross-sectional view of a corner portion showing the column beam joint portion 101 formed by the above-described welding, and shows the column beam joint portion 101 as viewed from above. As shown in FIG. 26, the lower square steel pipe 102 and the upper square steel pipe 103 are constructed by assembling a flat steel material having a large plate thickness, and the corners are substantially perpendicular. On the other hand, the box-shaped cross-section steel pipe 104 is configured such that the corner portion 107 has an arcuate curved surface having a round shape.

  The rounded corner portion (corner portion) 107 of the column beam joint portion 101 configured in this way is located between the lower square steel pipe 102 and the upper square steel pipe 103 with respect to the corner portion 107 of the box-shaped cross-section steel pipe 104. Thus, the rounded inner portion is shifted to the inside of the box-shaped cross-section steel pipe 104, and the lower square-shaped portion of the round-shaped portion is partially exposed at the inner corner of the lower square steel pipe 102, and the staggered portion 108. May occur.

  Therefore, in the present embodiment, four rectangular steel plates 1 (1a, 1b, 1c, 1d) are combined in a box shape, and the side edges of the respective steel plates are welded to each other, thereby providing a steel beam column beam joint. It is a welding method of the corner | angular part which forms the square steel pipe 104 which has the four-surface assembly box-shaped cross section of the part 101, Comprising: Each said steel plate 1 (1a, 1b, 1c, 1d) which formed the groove | channel in the both-sides edge part is a vertical type. The side edges of the steel plates 1a, 1b, 1c, and 1d are arranged adjacent to each other, and the welding torches 10 are respectively arranged between the side edges of the steel plates 1a, 1b, 1c, and 1d. All corners are electroslag welded or electroslag gas arc welded simultaneously.

  According to this embodiment, a staggered portion does not occur between the corners of the square steel pipes 102 and 103 constituting the column beam joint portion 101 and the corners of the box-shaped cross-section steel pipe 104 arranged therebetween. The processing becomes simple and the work efficiency can be improved.

  In addition, when welding is performed, the weld line is arranged as much as possible in the corner portion, and the weld metal is formed on the inner side of the corner portion, so that it is possible to prevent the discrepancy that has conventionally occurred.

  In other words, it is possible to prevent the butt joint between the square steel pipes 102 and 103 and the box-shaped cross-section steel pipe 104 from colliding with each other in the joint portion of the upper and lower square steel pipes 102 and 103 and the box-shaped cross-section steel pipe 104 having a round shape. it can.

  Also, when the plate thicknesses of the upper and lower rectangular steel pipes 102 and 103 engaged with the box-shaped cross-section steel pipe 104 are different, the plate thickness of the box-shaped cross-section steel pipes 102 and 103 is increased (increased) so Can be absorbed.

  Further, in the column beam joint portion 101, the thickness of the box-shaped cross-section steel pipe 104 is increased (increased) compared to the thickness of the square steel pipes 102 and 103 that are vertically joined to each other. The diaphragm can be omitted.

  Further, in a column beam joint welding method of a box-shaped cross-section steel pipe that joins a plurality of steel plates by welding to form a hollow box-shaped column beam joint portion 101, particularly in a welding method by electroslag welding, By devising the groove shape that forms the weld metal on the inner side, the weld line can be arranged at the corners as much as possible, thereby preventing the discrepancy.

1 (1a, 1b, 1c, 1d) Steel plates 2a, 2b, 2c, 2d Welding wires 3a, 3b, 3c, 3d Bag-like storage devices 4a, 4b Support base 5 Guide roller 6 Guide tube 8a Start tab 8b End tab 9 Groove DESCRIPTION OF SYMBOLS 10 Welding equipment 11 Closure material 12 Welded part 13 Beam-beam joint part 14, 15, 16 Steel column (box-shaped cross section steel pipe and square cross section steel pipe)
17 Beam 18 Bottom plate 19 Groove 21 Box-shaped cross section steel pipe 22 Corner 23 Backing metal 24 Welding part 25 Recess 26 Welding part 27 Groove 28 Steel plate material 29 Corner 30 Contacting plate 31 Water-cooled copper plate 32 Backing metal 33 Central member 34 Cooling water flow hole 40 Welding machine 41 Wire feeding device 43 Welding torch 44 Flux 45 Welding wire (electrode wire)
101 Column beam joint 102 Lower square steel pipe 103 Upper square steel pipe 104 Box section steel pipe 201 Through diaphragm 202 Upper square steel pipe 203 Lower square steel pipe S1 Gap θ Groove angle c Gap width

Claims (11)

By combining four rectangular steel plates into a box shape, and welding the side edges of each steel plate, a corner portion welding method for forming a square steel pipe having a four-sided assembly box section of a column beam joint The steel plates with grooves formed on both side edges are arranged vertically and the side edges of the steel plates are adjacent to each other, and a welding torch is provided between the side edges of the steel plates adjacent to each other. A welding method characterized in that each of the welding torches is moved from below to above and the corners of all the steel plates are electroslag welded or electroslag gas arc welded simultaneously. The welding method according to claim 1, wherein the steel plates forming the four faces of the square steel pipe are arranged in a box shape, and the groove is inclined 45 degrees to perform electroslag welding or electroslag gas arc. The welding method according to claim 1, wherein a groove shape of a corner weld portion forming the square steel pipe is set to an inclined surface of 45 degrees or less toward the inside of the box-shaped cross-section steel pipe. The welding method according to claim 2 or 3, wherein the groove angle is set to gradually expand toward the inside of the box-shaped cross-section steel pipe. 5. The welding method according to claim 3 or 4, wherein a gap between the opposing edges of the steel plate forming the square steel pipe is set to a constant value and welding is performed simultaneously. The welding method according to any one of claims 3 to 5, wherein a groove of a side edge of each steel plate is set to be less than 45 degrees with respect to a plate surface of the steel plate, and a plate surface interval of the groove is set. A welding method in which a constant interval between parallel surfaces is gradually increased inward. The welding method according to any one of claims 3 to 5, wherein a groove of each opposing edge of the steel plate is set to 45 degrees with respect to a plate surface of the steel plate, and a plate surface interval of the groove is constant. Welding method as parallel plane. The welding method according to any one of claims 3 to 7, wherein a plate width of the pair of each square steel plate arranged in one direction is increased, a plate width in a direction orthogonal to the pair is decreased, and the plate width is reduced. A welding method in which a small steel plate is arranged and welded between steel plates having a large plate width. The welding method according to claim 1, wherein four rectangular steel plates are arranged in a box shape so as to be opposed to each other by forming an inclined groove at an edge thereof, and the steel plates arranged in the box shape are adjacent to each other. A welding method in which a groove formed of an inclined surface is formed at an end edge portion and welding is performed in a state where a distance between the grooves of adjacent steel plates is kept constant. The welding method according to claim 1, wherein four rectangular steel plates are opposed to each other and arranged in a box shape, a groove is formed at adjacent edge portions of each rectangular steel plate arranged in the box shape, and the adjacent rectangular steel plates are arranged. A welding method in which the distance between the gaps between the steel plates is kept constant along the vertical direction, and welding is performed in a state where a backing metal is installed at each inner corner. The welding method according to claim 10, wherein a concave portion is formed in a portion of the backing metal facing a corner portion on the inner surface side of the rectangular steel plate.

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