JPH01293990A - Beveled steel pipe with backing metal and its forming method - Google Patents

Abstract

PURPOSE:To obtain a good butt joint by forming the plate thickness of a column thicker to the inside near the end face, forming a backing metal with slightly leaving the part thereof in the longitudinal direction and making the steel plate end face in the bevel part of an inclination of an obtuse angle to the external part from the outside base part of the backing metal. CONSTITUTION:The beveled part 3 of a steel plate forming a column 1 is equipped with an angular face optimum for the one side butt welding of the steel plate in the plate thickness of a column material. A backing metal 4 is form with the root interval 6 optimum for forming a butt welding joint to seal the bottom part of a welding bevel. Beveled backing metal forming are executed mechanically by a hot stamping or roll forming, so integral with a main body on the material, with enough strength and good accuracy. In case of abutting the end face of the backing metal 4 to the diaphragm 2 plane no gap is formed nor any fear of the leakage of a molten metal. Due to right angles being formed on the end face and column shaft center no distortion is caused on the shaft center of the assembled column-beam connection. Consequently the manhour in assembling is reduced and the column-beam connection of high accuracy can be assembled.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention is directed to a steel pipe with a beveled backing metal (round pipe, round pipe, etc.).
Refers to square steel pipes, etc. ) and its molding method.

<Prior Art> Recently, the number of cases in which steel pipe columns are used to assemble steel structures has increased.

When constructing a structure with two or more floors, a joint structure between columns and beams is inevitably formed. Among the above-mentioned connections between columns and beams, that is, the structure of column-beam joints, in the case of beam-through type and diaphragm-through type,
Butt weld joints between the diaphragm plane and column end faces are often used for column beam joint assembly.

In the conventional technology, as shown in FIG.
As a preliminary work to butt weld the column end face to the F side,
Gas welding, mechanical cutting, etc. are used to create the bevel 3 on the bath contact portion of the end face of the column 1. Also, since back welding is normally not possible with tubular members, flat steel or square steel is used. Bend it in advance to fit the inner peripheral wall of the column,
This was used as a backing material (backing metal) 4' and was temporarily attached 5 to the inner side of the column end face to secure the root spacing.

Incidentally, the suitability of the welding process itself is of course important in forming a reliable butt-welded joint, but uniform and accurate groove shapes and root spacing on the end face as preliminary processing are required. Ru. However, in the prior art, the above-mentioned preliminary machining is all done manually, so it takes more effort than it appears to do to perform accurate machining, and the temporary attachment 5 of the backing metal 4' is difficult. Its ends are folded into one plane.

For this reason, a defective joint may occur, such as defective welding due to the generation of a gap between the diaphragm 2 and the backing metal 4', or complete failure of the fitting due to poor adhesion of the backing metal 4'. Particularly in the case of the non-sectional structure shown in FIG. 6 used in on-site processing, welding troubles frequently occur due to defects in the backing metal 4'. Furthermore, there is a problem in that the length of the additional backing metal 4' varies, and that it is difficult to achieve straightness as a whole in a column that is assembled using such a column end face and has many pillar beam joint structures.

<Problems to be Solved by the Present Invention> In view of the above-mentioned problems inherent in the prior art, the present invention prepares columns with end faces pre-processed into a shape according to the purpose at the distribution stage, and It is an object of the present invention to provide a column with a bevel and a backing metal which does not require the above-mentioned preliminary processing for mouth assembly.

In addition, at the column forming stage, we can form and process the bevel in an accurate and uniform shape in advance without requiring large-scale equipment. The purpose of this project is to develop a method for forming all the parts, to reduce the number of man-hours required for assembling column beams and joints, and to efficiently assemble column and beam joint structures equipped with high-quality welded joints.

Furthermore, groove processing and processing equivalent to all backing welding are performed in one process.
The purpose is to develop a molding method that can be formed efficiently.

<Means for Solving the Problems> In order to achieve the above-mentioned object, the present invention includes the constituent elements as described below.

(1) The thickness of the steel plate constituting the column is increased inwardly near the cut end surface, and approximately only the thickened inward portion is left slightly in the longitudinal axis direction of the column, and the backing metal is attached. A steel pipe with a beveling and backing metal, characterized in that the edge of the steel plate is formed into an obtuse inclined surface outward from the base of the outer surface of the backing metal to form a beveled part. .

(2) After heating the end of the column to be formed to a predetermined temperature, the shape of the outer circumferential wall of the annular groove is approximately the same as the outer circumference of the column to be processed at a right angle, and the width of the groove is smaller than the column thickness. is made larger, the bottom of the groove cross section is inclined inward, and the deepest and narrowest annular part of the groove is formed on the inner side of the intermediate groove. A method for forming a steel pipe with a beveling and backing metal, characterized in that the column end face is formed into the shape described in the above item (1).

(3) After heating the end of the column to be formed to a predetermined temperature, the end face is placed on a core base, centered and fixed, and supported on a rotating shaft parallel to the core axis, with at least the root A plurality of forming rollers having varying intervals and bevel angles on the outer periphery are rotated relatively around the core axis on the table and brought close to each other in the core axis direction, so that the outer peripheral wall of the column is formed into a suppressing roll. A method for forming a steel pipe with a beveling and backing metal, characterized in that the column end face is formed into the shape described in item (1) above.

(4) After heating the end of the column to be formed to a predetermined temperature, the end of the column is at least equivalent to the beveled surface on the peripheral surface of the roll rotatably supported by an axis perpendicular to its central axis. The forming roll supporting member is rotated around the column center axis while being relatively pressed into the groove of the forming roll provided with the annular groove having a concave cross section formed by the slope and the entire cross section of the backing. A method for forming a steel pipe with a bevel and a backing metal, characterized by moving the column end face to conform to the groove shape of the forming roll, and forming the column end face into the shape described in item (1) above.

<Function> (1) The end face of the steel pipe column is integrally formed with a bevel and a backing metal member that has been appropriately formed in advance, so that the steel material that makes up the column and the backing metal member are made of the same material. Because of this structure, when the diaphragm is brought into contact with the diaphragm, all the end faces of the backing come in close contact with the diaphragm plane without any gaps, forming a predetermined root spacing, and a solid backing metal is provided, making it exceptional. The welding process can be started without the need for preparatory work, and as a result, the assembled column beam joint structure has good precision, and a reliable and good butt welded joint can be obtained.

Therefore, it is possible to reduce the number of man-hours required for assembling pillar beam joints, increase work efficiency, and improve the safety of the building, which is useful in the construction of structures that frequently use through-diaphragm type pillar beam joints. Provides columns that are very useful as materials.

Not only that, but because the column ends are formed by mechanical means, the product is uniform and has a right angle, and when this type of column is used to assemble a through-diaphragm type column beam joint, and it is used frequently. , the accuracy of the entire column is impaired. It's fleeting.

(2) Forming method After the end surface of the steel pipe is processed, it is heated to the required temperature using known heating means such as gas heating, high-frequency induction heating, electric heating, etc., and then the steel pipe (column) is secured, stamped or By hot roll forming, the shape of the cut surface of the end face including the column axis is plastically formed into a shape with a beveling and backing metal by - times of processing without producing cutting waste.

The compression and forming operations between the mold tool and the column end face are relative, and if the column has a circular cross section at right angles, it is also possible to fix the tool side and rotate and press the column against it. It's not possible.

In the above-mentioned forming of the column end surface, plastic deformation is performed using a die tool at high temperatures, so the shape of the briquette coal is accurate and uniform, and the material is integral, and there is little residual stress due to deformation. , Even if the relevant parts are welded, the quality of the welded joints is often adversely affected.

The molding method of the present invention utilizes a column holding means during column manufacturing or cutting, and does not require particularly large-scale equipment, and can be performed in a factory facility with well-equipped equipment and environment. Since the forming process can be completed in one operation, the end face processed column can be provided relatively economically.

Note that forming the end face of a square column (RI stamping is advantageous, but roll forming is also possible. When using forming rolls, one method is required for changes in column diameter within the range of forming. There is an advantage that mold tools can be used.

<Example> (1) Steel pipe FIG. 1 is an example of a cross section of the column end face of the present invention cut along a plane including its central axis. In the figure, Jj, column body, 2 are: The diaphragm 3 is a beveled portion of a steel plate constituting the column, and has an angular surface suitable for single-sided butt welding of a steel plate having the thickness of the column material. 4 is
A backing metal provides the appropriate root spacing 6 for butt weld joint formation and seals the bottom of the rhombic weld groove. Bevel processing on the column end face
The backing metal is formed mechanically by hot stamping or roll forming, so the material is integrated with the main body, so there is no need to worry about strength, and it has good precision and a reliable, uniform shape. When all four end faces of the diaphragm 2 are brought into contact with the diaphragm 2 with the backing metal, no gaps are created between the two, and there is no fear that the backing metal will be damaged and hot water will leak. Furthermore, since all end faces of the backing and the column axis are correctly perpendicular to each other, the column beam joints assembled using the columns of this embodiment are carefully prevented from being distorted.

The plate thickness of the butt weld is approximately equivalent to the thickness of the steel plate constituting the column plus the thickness of the backing metal 4.
By simply forming the butt weld joint 7, sufficient strength can be achieved.

(2) Molding method; Part 1 Figure 2 shows an example of the cross section of the hot die molding. In the figure, 8 is the die body, and 9 is the cross section that receives the end face of the column is a substantially U-shaped groove, and its width is approximately equal to the thickness of the column steel plate plus the thickness of the backing metal. 10
11 is the bottom surface on the outer peripheral side of the groove 9 and is inclined inward to form a beveling surface, and 11 is the deepest U-shaped groove on the bottom surface on the inner peripheral side of the groove 9 for forming the backing metal. ing.

After uniformly heating the end face (hatching part) of the column 1 with gas, electricity, or other heating means, the end face is pressed at a right angle relative to the grooved die 8 described above and formed by die forging to form the end face. Process the bevel and form it into the shape of the backing metal. In the grooved die 8, the depth of the groove 9 is preferably made slightly larger than the length of the end face molding part of the column so that the outer periphery of the column 1 can be guided by /.

Hydraulic mechanisms are generally used for relative movement of the die or column, but other mechanical means used in die forging may be used here.

The above-mentioned forming method is a processing method that can be easily applied even when the equipment is not complicated and the column cross section is rectangular, but it is necessary to prepare molds that are compatible with the size of the outer diameter of the column cross section. Ranarai.

Furthermore, since the inner diameter of the groove 9 varies depending on the thickness of the plate forming the column, the diameter of the core mold surrounded by the groove 9 should be designed to be adjustable.

Part 2 FIG. 3 shows an embodiment of a hot roll forming method for column end faces. In the figure, 12 is a mold, 13 is a core mold erected in the same mold, 14i1';j:, a forming roll with a root interval, a minute end face, a bevel processing slope, and an outer circumferential surface that is clear on the outer wall of the column. The same roll has a shaft 15 installed parallel to the core shaft.
The core shaft is rotatably supported around the core shaft, and is provided so as to be able to move toward and away from the core shaft in the radial direction. The above-mentioned radial movement of the forming rolls 14 is usually performed using a hydraulic mechanism.

The end face (hatching part) of the column 1 is heated to a required temperature, and then bonded and fixed to the surface of the mold 12 so as to fit the core mold 13 therein, and then the forming roll 1 that slides on the surface of the mold 12
4's spindle] While rotating 5 around the core 13 axis,
By gradually moving it toward the center in the radial direction, the end face is gradually transformed into a beveled and backing metal shape.
Hot roll forming.

At that time, if an appropriate gap is provided between the diameter of the core mold 13 and the inner diameter of the column 1, it will not only be easy to set the column 1 into the mold 12, but also the backing can be made using the gap. Full thickness can be obtained. In addition, since it is necessary to change the diameter of the core mold 13 according to the thickness of the steel plate constituting the column 1, the core mold 13 is fixed to the mold 12 so as to be attachable and removable.

The above forming method can be applied as is to forming the end face of a steel pipe column with a circular cross section, but it is also possible to form the end face of a square column by controlling the cross sectional shape of the core mold and the radial movement of the forming rolls as required. This construction method has the advantage that even if the column diameter is slightly changed, it can be handled by simply adjusting the attached parts, without having to prepare many types of tools.

Part 3 FIG. 4 shows another example tool for the hot roll forming method of the column end face. In the figure, 16 is a forming roll in which grooves 9 having the cross-sectional shape explained in Example (Part 1) are cut on the circumferential surface, and the supporting shaft 17 is provided perpendicularly to the column axis. This support shaft supports the forming roll 16 so that the outer wall of the groove 9 cut into the roll always moves along the peripheral wall of the column 1, and extends along the longitudinal axis of the column 1. It is provided so as to be close to and separated from the end face. To move the forming rolls toward and away from the column end faces, a hydraulic mechanism is usually used, or other mechanical means may be used.

In the case of this embodiment, hot roll forming is performed by rotating and pressing the molding hole (only) while resting on the heated end face of the column. Therefore, it is suitable for forming the end face of a round cross-section steel pipe, and can accommodate considerable variations in column diameter with one type of equipment, and is easy to work with.

<Effects of the Invention> Since the present invention is as described above, the beveling of the pipe end as a preliminary welding work and the entire backing forming process are completed simultaneously and uniformly as one unit, and it is possible to perform the assembly process. This not only saves man-hours, but also eliminates problems such as welding defects due to gaps between the drawing column and the backing metal, and breakage accidents due to poor adhesion of the backing metal, which constantly occur with conventional manual methods. , all are resolved.

Also, the length of the backing metal at the welded joint of the column (
This eliminates variations in the root spacing, making it possible to assemble a pillar beam joint with reliability and high precision.

Furthermore, if the column end faces are beveled and the backing is fully formed in a fully equipped factory during the distribution stage, the work can be easily done with a few incidental equipment, and the man-hours and labor costs can be saved. Furthermore, it is possible to provide a steel pipe column that increases the value of one additional bend, has good precision, and is easy to use.

Note that since hot plastic deformation is used to process the end face of the column, unnecessary internal stress associated with the process does not remain. Furthermore, since the backing metal and the main body to be welded are made of the same material, a reliable and good butt weld joint can be formed.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of one embodiment of the column end surface of the present invention, and FIG. 2 is an embodiment of a mold for hot stamping the beveling and backing metal forming end surface of the present invention shown in FIG. Example cross section, 3rd
The figure also shows a tool and a forming roll for hot roll forming, FIG. 4 shows a schematic diagram of another type of hot forming roll, and FIG. 5 shows a butt welded joint between a column and a diaphragm according to the prior art. The cross-sectional view of the structure, Figure 6, is the same
1 shows a cross-sectional view of another type of butt weld joint using conventional techniques; FIG. ■...Column, 2...Diaphragm, 3
...Beveled surface, 4...Backing metal, 5...Welding for temporary attachment, 6...Root spacing, 7...Welded joint, 8...Mold body, 9... groove type,
10...Slanted bottom surface, ]1...U-shaped groove, 12
... Mold, 13... Core mold, 14.16.
... Forming roll, 15.17... Roll support shaft. Agent Patent Attorney Mizu 1) Hiroshi - a'+n,

Claims (1)

[Scope of Claims] 1. The thickness of the steel plate constituting the column is increased inwardly near the cut end surface, and approximately only the thickened inward portion is left slightly in the longitudinal axis direction of the column. A beveling/backing plate characterized in that a backing plate is formed and the end face of the steel plate is formed into an obtuse inclined surface outward from the base of the outer surface of the backing plate to form a grooved part. Steel pipe with gold. 2. After heating the end of the column to be formed to a predetermined temperature, the shape of the outer peripheral wall of the annular groove is approximately the same as the outer periphery of the right-angled section of the column to be formed, and the width of the groove is larger than the thickness of the column. year,
The cross-sectional bottom of the groove is inclined inward, and the deepest and narrowest annular portion of the groove is formed on the inner side of the groove. A method for forming a steel pipe with a bevel and a backing metal, the method comprising forming a steel pipe into the shape according to claim 1. 3. After heating the end of the column to be formed to a predetermined temperature, the end surface is brought into contact with a core-equipped stand, centered and fixed, and supported on a rotating shaft parallel to the core axis, with at least the root spacing and opening. A plurality of forming rollers having an angular tip surface on the outer periphery,
The outer circumferential wall of the column is pressed and rolled by rotating it relatively around the core axis on the table and approaching the core axis in the direction of the core axis, and forming the column end face into the shape described in claim 1. A method for forming a steel pipe with a bevel and a backing metal. 4 After heating the end of the column to be formed to a predetermined temperature, the end face of the column is heated at least on the slope and the back side corresponding to the beveled surface on the peripheral surface of the roll rotatably supported by an axis orthogonal to the central axis. In the groove of the forming roll provided with an annular groove having a concave cross-sectional shape formed by the cross-section of the pad,
While relatively pressing the forming roll support member,
The column end face is rotated around the central axis of the column to conform to the groove shape of the forming roll, and the column end face is rotated around the center axis of the column to conform to the groove shape of the forming roll.
A method for forming a steel pipe with a bevel and a backing metal, characterized by forming the pipe into the shape described in 1.