JP3725076B2 - Manufacturing equipment for square steel pipes - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  In the present invention, for example, when connecting columns of a steel structure with a beam material, a thickened portion for securing a plate thickness is formed in the beam material connection portion on the column side.CornerThe present invention relates to a steel pipe manufacturing facility.
[0002]
[Prior art]
Conventionally, the beam material connecting part on the column side is a beam penetration method in which a column, that is, a round steel tube or a square steel tube is cut into a plurality of lengths, and a groove is formed on each cut surface, and then a diaphragm is attached. However, according to this method, there is a problem that much time and cost are required for cutting work and groove working work, and there are many welding points.
[0003]
In addition, as a method of not cutting round steel pipes and square steel pipes, as shown in, for example, Japanese Patent Application Laid-Open No. 7-238636, an inner diaphragm in which a backing metal is temporarily welded around both sides is inserted into the steel pipe. A method is proposed in which the inner wall of the steel pipe and the outer periphery of the inner diaphragm are welded to the outer periphery of the inner diaphragm using a through-hole after the backing metal on the insertion port side is temporarily welded to the inner wall of the steel pipe. However, this method also required welding work.
[0004]
Therefore, as what can eliminate the welding work, for example, as shown in Japanese Patent Application Laid-Open No. 11-169994, a thickened portion protruding in a ring shape by a desired amount is formed at a predetermined distance from one end face thereof. Tube is provided.
[0005]
And the pipe | tube body which formed this thickening part is located in the outer side of a pipe | tube body, and the several heating means which can move separately in a pipe | tube longitudinal direction is provided, and at least one heating means of the pipe | tube body is provided. Heat the target location, distribute the heating means to both sides of the tube longitudinal direction with respect to this heating location, and apply compressive force in the tube longitudinal direction to the heating location while heating both sides of the heating location And it manufactures by the method of increasing the thickness of some materials of a heating location one by one.
[0006]
According to such a manufacturing method, the local heating of the target portion of the tube body and the heating on both sides of the heating portion by the heating means group that has been distributed and moved can reduce the gap between the inner surface of the heating means and the outer surface of the tube body. . Then, by applying a compressive force in the longitudinal direction of the tube to the heating location by the compressive force applying means, a part of the material of the heating location is successively increased inward and outward at the portion between the heating means, and thus one end surface of the tube A thickened portion protruding in a ring shape in a desired amount from the inside to the outside can be formed at a predetermined distance from the inside.
[0007]
[Problems to be solved by the invention]
However, according to the above-described tubular body having the thickened portion, the rib-shaped thickened portion is formed to protrude outward, so that when connecting the beam material, the end surface (weld joint surface) of the beam material Must be processed into a laterally convex shape from the outer surface of the thickened portion of the pair of thickened portions along the outer surface of the tube body between the two thickened portions, which makes the production complicated. Further, the base portion of the thickened portion with respect to the tubular body is formed in an R-shaped portion, and therefore, the floor slab (deck plate) placed on the beam material is formed on the outer surface of the tubular body due to the R-shaped portion as an obstacle. Therefore, it is necessary to prepare a separate floor plate that is formed so that the end portion is along the R-shaped portion. As a result, the overall cost was increased.
[0008]
  Therefore, the invention according to claim 1 of the present invention is, IncreaseA square steel pipe that can easily manufacture a square steel pipe that does not have protrusions on the outer surface of the meat beam connecting part.production equipmentIs intended to provide.
[0010]
[Means for Solving the Problems]
  In order to achieve the above object, the rectangular steel pipe according to claim 1 of the present invention.Manufacturing equipmentBy bending the steel sheet and then butt weldingApproximate to regular sized and shaped square steel pipeRoughly formed square steel pipeSupported by the pipe making means and the supporting meansHeating the target part of the rough formed square steel pipeFirst heating means to, In this heating spotRough moldingApplying compressive force in the longitudinal direction of the square steel pipeAddIncrease the thickness of some materials in the hot spotCompressing force applying means, and outer surface regulating means for regulating the outer surface of the heating location;Heating the entire rough formed square steel pipe with the thickened part formed at the target locationA second heating means, and a roughly formed square steel pipe heated to a predetermined temperature as a whole,The dimension between the outer surfaces of the opposed sides and the radius of each corner are smaller than the dimension and radius of the rough-formed square steel pipeAndAnd its outer surfaceTheA flat shape over the entire lengthSquare steel pipeHot formingThe compression force applying means comprises a receiving device that can contact the one end surface of the rough formed square steel pipe and a pushing device that can contact the other end surface of the rough formed square steel tube. The receiving device includes a base body, a receiving carriage provided on the base body, a pressure receiving body erected on the receiving carriage side, and a receiving side clamp provided between the pressure receiving body and the base body side. The pushing device includes a main carriage provided on the floor, a push carriage provided on the main carriage, a pressure body provided upright on the push carriage, and the pressure body. And a push-side clamp device provided between the main carriage side and the receiving-side clamp device. The receiving-side clamp device and the push-side clamp device are each configured to clamp a roughly formed square steel pipe from inside and outside, and the receiving device. And the pushing device between the first It is provided with said outer surface regulating means and thermal meansIt is characterized by being.
[0013]
  ThereforeClaim 1According to the inventionFirst, in a state where the receiving cart and the push cart are moved apart (retracted) from each other,Roughly formed square steel pipe formed by bending a steel plate and then butt weldingThat is, the rough-formed square steel pipe before partial thickening is placed on the support means. And after arrange | positioning a receiving side clamp apparatus, a push side clamp apparatus, a 1st heating means, and an outer surface control means to a rough forming square steel pipe, a receiving cart and a push cart are moved close to each other (forward movement). At that time, one end of the roughly formed square steel pipe is brought into contact with the front surface of the pressurizing body to position the roughly formed square steel pipe. In this state, the rough-formed square steel pipe is clamped from inside and outside by the receiving side clamping device and the pushing side clamping device.
  With this set,After subjecting the target portion of the rough formed square steel pipe to local heating by the first heating means, the compressive force applying means applies a compressive force in the longitudinal direction to the heating portion and regulates the outer surface of the heating portion. Regulate by means. In this case, the compressive force is obtained by moving the main carriage closer to the base body and thus moving the push side clamping device closer to the receiving side clamping device. With this compressive force, in the part facing the first heating means,A part of the material at the heating portion is gradually increased in thickness toward the inner surface side, and a thickened portion protruding in a ring shape by a desired amount inward can be formed at a predetermined distance from one end surface of the roughly formed square steel pipe. Then, after heating the entire rough formed square steel pipe by the second heating means, the square steel pipe is hot-formed into a square steel pipe by the square steel pipe forming means, thereby obtaining a square steel pipe having no protruding portion on the outer surface of the thickened beam connecting portion. Can be manufactured.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Below, the 1st Embodiment of this invention is described based on FIGS.
As shown in FIG. 1 to FIG. 3, a square steel pipe manufacturing facility 10 is a rough-formed square steel pipe (original pipe) that approximates a square steel pipe 7 having a regular size and shape by bending and then welding the steel sheet 1. ) Tube-forming means 11 for pipe-forming 5, a first heating means 60 for heating a target location (or a heating location) B of the coarse-formed square steel pipe 5, and a coarse-formed square steel tube at the heating location B A compression force applying means 20 for applying a compressive force in the longitudinal direction A to increase the thickness of a part of the material at the heating location B, an outer surface regulating means 67 for regulating the outer surface 5b of the heating location B, and a target location B The second heating means 70 for heating the whole of the rough-formed square steel pipe 5 formed with the thickened portion 8 and the heated rough-formed square steel pipe 5 between the outer surfaces of opposite sides (product outer dimensions) d and The radius r of each corner is smaller than the dimension D and radius R of the rough-formed square steel pipe 5 , And it is configured of a square tube forming means 75 for hot molding RHS (products) 7 which is a flat shape over its outer surface 7b in length.
[0019]
First, the operation of the pipe making means 11 will be described. As shown in FIG. 1, a strip-shaped steel sheet 1 having a thickness t of 4.5 mm to 50.0 mm is conveyed in the length direction 1A, passed through a groove processing machine 12, and a groove 2 on both side edges in the width direction 1B. And cut into a predetermined length before and after this. Then, the steel plate 1 is placed in the former forming press 13, and the corners 3 having a large radius R are bent and formed at two locations close to the side edge by raising and lowering the upper die with respect to the lower die. Next, it is placed in the latter-stage molding press 14, and the corner 4 having a large radius R is bent and formed at two intermediate positions by raising and lowering the upper mold with respect to the lower mold.
[0020]
Then, at the portion of the tack welding machine 15, the four sides are pressed and shaped from the outside by a group of rolls 15a (or cylinders) so that the grooves 2 are abutted to form a square steel pipe 5A. On the other hand, tack welding is applied. Next, the rectangular steel pipe 5A is transferred to the inner surface welding machine 16 to perform inner surface welding, and then transferred to the outer surface welding machine 17 to perform outer surface welding. Thereafter, the outer bead is removed by moving to a bead removing device, and as shown in FIG. 1 and FIG. 11 (a), it has a butt weld (seam weld) 6 and has an outer dimension D and radius. A rough-formed square steel pipe 5 having a slightly larger R can be formed.
[0021]
Here, as the rough-formed square steel pipe 5, a tube having a thickness t of 4.5 mm to 50.0 mm, an outer dimension D of 220 mm + several mm to 550 mm + several mm, and made of SM490A, SM520B, SS400, SN400B, SN490B, or the like is used. Is done. And the rough-formed square steel pipe 5 is set to two places (one or a plurality of places) in the longitudinal direction A as one set, and two sets (one or a plurality of sets) are set as target places B to be increased in thickness. . As the rough-formed square steel pipe 5, one having an outer dimension D (220 mm + several mm to 550 mm + several mm) slightly larger than the product outer dimension d (200 mm to 550 mm) of the square steel pipe 7 as the final product is used.
[0022]
As shown in FIG. 3, the predetermined path portion in the manufacturing equipment 10 is provided with support means 18 capable of supporting the rough-formed square steel pipe 5, and the support means 18 allows the rough-formed square steel pipe 5 to extend in the longitudinal direction A. Are supported and transported in the horizontal direction. The support means 18 is, for example, a roller conveyor type that supports the roughly formed square steel pipe 5 by a group of flat rollers 19.
[0023]
The compressive force applying means 20 applies a compressive force in the longitudinal direction A to the rough-formed square steel pipe 5 supported by the support means 18, and a receiving device 21 in which one end surface of the rough-formed square steel pipe 5 can freely come into contact. And a pushing device 41 that can be brought into contact with the other end surface of the roughly formed square steel pipe 5.
[0024]
The receiving device 21 is provided on a base body 22, a receiving carriage 24 supported and guided by wheels 23 on a guide rail (not shown) provided on the base body 22, and the base body 22. Rack body 25, a pinion 26 provided on the receiving carriage 24 side to mesh with the rack body 25, and a forward / reverse drive unit (motor or motor) provided on the receiving carriage 24 side to be interlocked with the pinion 26. 27), a pressure receiving body 28 erected on the receiving carriage 24, and a receiving side clamp device 30 provided between the pressure receiving body 28 and the base body 22 side. ing.
[0025]
Here, the receiving side clamping device 30 is configured by an inner clamping part 31 provided on the pressure receiving body 28 side and an outer clamping part 35 provided on the base body 22 side. That is, the inner clamp part 31 has an arm body 32 continuously provided from the pressure receiving body 28 toward the pushing device 41 side, and the arm body 32 is configured to be extendable and contractable by a multistage cylinder type or the like. The free end of the arm body 32 is moved into and out of the width direction of the rough-formed square steel pipe 5 by the operation of the cylinder device 33, so that the inner side 5a of the rough-formed square steel pipe 5 can be contacted and separated. A clamp piece 34 is provided.
[0026]
The outer clamp portion 35 is provided at the end of the base body 22 on the pushing device 41 side, and the main body 36 provided on the base body 22 side has a shape that allows the rough-formed square steel pipe 5 to be inserted. Yes. A plurality of outer clamp pieces which can be brought into contact with and separated from the outer surface 5b of the rough formed square steel pipe 5 by being moved back and forth in the radial direction of the rough formed square steel pipe 5 by the operation of the cylinder device 37 inside the main body 36. 38 is provided.
[0027]
The pushing device 41 is supported by a guide rail (not shown) provided on the floor via a wheel 42, and a guide rail (not shown) provided on the main cart 43. ), And a rack body 46 provided on the main carriage 43, and a pinion 47 provided on the side of the push carriage 45 to mesh with the rack body 46, A forward / reverse drive part (consisting of a motor, a speed reducer, etc.) 48 provided on the push carriage 45 side to be interlocked with the pinion 47, a pressurizing body 49 standing on the push carriage 45, It is comprised by the press side clamp apparatus 50 etc. which were provided between the pressurization body 49 and the main trolley | bogie 43 side.
[0028]
Here, the push-side clamp device 50 includes an inner clamp portion 51 provided on the pressing body 49 side and an outer clamp portion 55 provided on the main carriage 43 side. Note that the pushing side clamping device 50 has the same configuration as that of the receiving side clamping device 30 described above, and the inner clamp portion 51 includes an arm body 52, a cylinder device 53, an inner clamping piece 54, and the like, and an outer clamping force. The part 55 includes a main body 56, a cylinder device 57, an outer clamp piece 58, and the like.
[0029]
Between the base body 22 and the main carriage 43, a compression force cylinder device 59 for moving the main carriage 43 toward and away from the base body 22 is provided. An example of the compressive force applying means 20 is configured by the above 21-59 and the like.
[0030]
As shown in FIGS. 3 and 8, the first heating means 60 is provided between the receiving device 21 and the pushing device 41 to heat the target portion B of the rough-formed square steel pipe 5 from the outer surface 5 b side. . As the first heating means 60, a high frequency heating method, a medium frequency heating method, or the like is adopted, and the first heating unit 60 is configured in a ring shape so as to allow the rough-formed square steel pipe 5 to be inserted.
[0031]
The first heating means 60 is configured to be movable in the longitudinal direction A of the rough formed square steel pipe 5 by the operation of the moving device 61. The moving device 61 includes a cylinder device 62 provided on the base body 22 side, a ring body 63 movable in the longitudinal direction A by the expansion and contraction of the cylinder device 62, and the like. Here, the ring body 63 is externally fitted to the rough-formed square steel pipe 5, and the first heating means 60 is provided on the inner surface side thereof.
[0032]
Further, the outer surface regulating means 67 is provided on the inner surface side of the ring body 63 at a position on the pushing device 41 side with respect to the first heating means 60. This outer surface regulating means 67 is a cylindrical guide type, and is made of a heat-resistant material such as ceramic that is not energized. The outer surface restricting means 67 has a penetrating restricting portion 68. The restricting portion 68 is formed on a straight restricting surface 68a having an inner diameter similar to the outer diameter D of the round steel pipe 1 on the pushing device 41 side. The device 21 side is formed on a trumpet-shaped inclined regulating surface 68b.
[0033]
Further, on the inner surface side of the ring body 63, a cooling means 65 is provided on the opposite side of the first heating means 60 with the outer surface regulating means 67 in between. As the cooling means 65, for example, the rough-formed square steel pipe 5 side is provided. The structure which can inject a cooling water toward is adopted.
[0034]
As shown in FIG. 2, the said 2nd heating means 70 is a heating furnace, for example, Comprising: The rough forming square steel pipe 5 which shape | molded the thickening part 8 in the target location B is carried in, and it carries out (passes). Thus, the entire rough formed square steel pipe 5 is configured to be heated.
[0035]
The square steel pipe forming means 75 is, for example, a roller squeeze type in which four flat rollers 76 are arranged in a rectangular shape, and the roughly formed square steel pipe 5 heated by the second heating means 70 is a product on the opposite side. The outer dimension d and the radius r of each corner are made smaller than the outer dimension D and the radius R of the rough-formed square steel pipe 5, and the outer surface 7b is formed into a flat shape over the entire length so as to be hot-formed. It is configured. The drawing forming unit comprising the flat roller 76 group is provided in a plurality of stages in the conveying direction, so that hot forming from the rough-formed square steel pipe 5 to the square steel pipe 7 is gradually performed step by step. Has been.
[0036]
Below, in the above-mentioned 1st Embodiment, the manufacture operation | work of the square steel pipe 7 which has the thickening part 8 is demonstrated. The operation of each unit is performed according to an instruction from a control device (not shown).
[0037]
First, as shown in FIG. 1, a rough-formed square steel pipe 5 is made by a pipe making means 11. That is, the belt-shaped steel plate 1 is conveyed in the length direction 1A, and the groove 2 is processed through the groove processing machine 12. And after putting the steel plate 1 cut | disconnected by predetermined length into the front | former stage shaping | molding press 13 and bending the corner part 3, it is put into the back | latter stage shaping | molding press 14, and the corner part 4 is bent. And in the part of the tack welding machine 15, after pressurizing and shaping the four sides from outside, the grooves 2 are abutted to form a square steel pipe 5A, and then tack welding is performed. Next, the rectangular steel pipe 5A is transferred from the inner surface welding machine 16 to the outer surface welding machine 17, and welding is performed, so that the roughly formed rectangular steel pipe 5 having the butt weld portion 6 can be formed.
[0038]
Next, a manufacturing operation of the square steel pipe 7 having the thickened portion 8 using the rough-formed square steel pipe 5 as an original pipe will be described. That is, first, as shown in FIG. 3, in a state where the receiving carriage 24 and the push carriage 45 are moved away (retracted) from each other by the driving of the respective forward / reverse drive portions 27 and 48, for example, by a carrying means such as a crane. The rough-formed square steel pipe 5 before partial thickening is placed on the hourglass roller 12 group of the support means 11. At this time, the 1st heating means 60 and the outer surface control means 67 can carry in the rough-formed square steel pipe 5, for example by dividing | segmenting into right and left (disassembly), and assemble (connect) after carrying in.
[0039]
Further, the receiving side clamping device 30 and the pushing side clamping device 50 are also divided and assembled in the same manner as necessary with the inner clamp pieces 34 and 54 and the outer clamp pieces 38 and 58 moved away from each other. Do. Thus, the outer clamp portion 35 of the receiving side clamp device 30, the outer clamp portion 55 of the push side clamp device 50, the first heating means 60, and the outer surface restricting means 67 are arranged on the rough-formed square steel pipe 5. Can do.
[0040]
Thereafter, the receiving carriage 24 and the push carriage 45 are moved toward each other (forward movement) by reverse driving of the forward / reverse driving portions 27, 48, and the arm bodies 32, 52 are inserted from both ends of the rough-formed square steel pipe 5, The inner clamp pieces 34 and 54 are opposed to the outer clamp pieces 38 and 58. At that time, one end of the rough-formed square steel pipe 5 is brought into contact with the front surface of the pressurizing body 49, thereby positioning the rough-formed square steel pipe 5. In this state, the inner clamp pieces 34 and 54 and the outer clamp pieces 38 and 58 are moved closer to each other, whereby the rough-formed square steel pipe 5 is clamped from the inside and outside by the receiving side clamp device 30 and the push side clamp device 50, and The thickened portion 8 is formed by heating with one heating means 60 or the like.
[0041]
Here, (a) in FIG. 4 and FIG. 8 shows the state before the first increase in thickness and before the second increase in thickness. That is, the receiving-side clamp device 30 clamps the vicinity of the first thickening portion 8, and the push-side clamp device 50 is a positioning posture in which one end of the rough-formed square steel pipe 5 is brought into contact with the front surface of the pressurizing body 49. And the predetermined part is clamped. And the 1st heating means 60 is made to oppose the target location B which set the predetermined space | interval P with respect to the thickening part 8 of the 1st time. At this time, the moving device 61 is operated to move the first heating means 60 along the longitudinal direction A, so that the first heating means 60 can be accurately opposed to the target location B.
[0042]
The target location B is determined according to the location, location, etc. where the rough-formed square steel pipe 5 is used as the final product, and is set in advance by inputting it into the control device. Here, the portion of the set distance C from one end face of the rough-formed square steel pipe 5 is the first target location B, and the portion at a predetermined interval P with respect to the first thickened portion 8 is the second target. The set distance C and the predetermined interval P are included in the portion B, and the length reduction due to the thickening action is also included.
[0043]
In the state set as described above, as shown in FIG. 4 and FIG. 8A, the first heating means 60 is operated to heat the target portion B of the rough-formed square steel pipe 5. This local heating can be quickly and cheaply reduced by reducing the gap between the inner surface of the first heating means 60 and the outer surface 5b of the rough-formed square steel pipe 5, and further to the inner surface 5a side. Yes. In addition, the heating width W by the 1st heating means 60 is set to 50 mm-300 mm, for example.
[0044]
Next, while the target location B is heated by the first heating means 60, a compressive force in the longitudinal direction A of the rough-formed square steel pipe 5 is applied to the target location B. As shown in FIG. 5, the compression force causes the compression force cylinder device 59 to contract and move the main carriage 43 closer to the base body 22, thereby pushing the clamping device 50 against the receiving side clamping device 30. It can be obtained by moving close to. With this compressive force, as shown in FIG. 4 and FIG. 8B, in the portion facing the first heating means 60, the partial material of the heated target location B can be gradually increased inward and outward. Thus, the thickened portion 8 projecting in a ring shape with a desired amount inside and outside can be formed.
[0045]
Here, the thickened portion length V of the thickened portion 8 is shorter than the heating width W due to the length reduction due to the thickening action. The thickness T of the thickened portion 8 due to the protrusion of the thickened portion 8 is arbitrarily set according to the purpose of use. For example, in contrast to the thickness t, [T = 1.5 t to 5.0 t]. It has become.
[0046]
In the state where the thickened portion 8 is formed in this manner, the moving device 61 is operated, thereby moving the ring body 63 along the longitudinal direction A toward the receiving device 21 as shown in FIG. 1 The heating means 60 is removed from the thickened portion 8. At that time, as shown in FIG. 5 and FIG. 8B, the outer surface regulating means 67 is applied to the outer protruding portion of the thickened portion 8.
[0047]
In other words, the inclined regulating surface 68b of the regulating portion 68 acts on the outer protruding portion of the thickened portion 8, so that the portion of the thickened portion 8 protruding in the ring shape by a desired amount is pushed inwardly. Can be molded. Thereby, as shown in FIG. 9 and FIG. 11B, the roughly formed rectangular steel pipe 5 can have the same outer dimension D over the entire length, and is thickened in a ring shape only at the inside at the target location B. It can be set as the shape which formed the thickening part 8 of the thickening part thickness T which protruded.
[0048]
Further, by operating the moving device 61, as shown in FIGS. 6 and 8 (c), the ring body 63 is moved along the longitudinal direction A toward the receiving device 21, and the cooling means 65 is moved to the thickening portion. 8 to face. Then, for example, cooling water is sprayed toward the thickened portion 8 by the cooling means 65, thereby cooling the portion of the thickened portion 8 in a heated state. Thus, the second molding of the thickened portion 8 is completed.
[0049]
Thereafter, the clamping of the receiving side clamping device 30 and the pushing side clamping device 50 is released, and the push cart 45 is moved forward to push and move the rough-formed square steel pipe 5 to the receiving device 21 side. At that time, the cylinder device 59 for compressive force is extended to move the main carriage 43 away from (return to) the base body 22, and the moving device 61 is operated to push the first heating means 60 toward the pressing device 41. Move back. Then, by clamping the receiving side clamping device 30 and the pushing side clamping device 50, as shown in FIG. 7, the third thickening portion 8 can be formed (initial state).
[0050]
After forming such a thickened portion 8 at a predetermined location (predetermined number), the reverse operation is performed to increase the number of 2 locations in the longitudinal direction A as one set to a total of 4 locations. The roughly formed square steel pipe 5 formed with the meat part 8 can be taken out. That is, as shown in FIG. 2, the rough-formed square steel pipe 5 is ring-shaped with a desired amount inwardly into a portion at a set distance C from the end face and a portion separated from the set distance C by a predetermined distance P. The thickened portion 8 protruding in the above can be formed.
[0051]
Next, the roughly formed rectangular steel pipe 5 having the thickened portion 8 formed in the target location B is carried into the second heating means (heating furnace) 70 and heated, and then taken out from the second heating means 70 (passing). By doing so, the entire rough formed square steel pipe 5 can be heated to a predetermined temperature (for example, a temperature exceeding the A3 transformation point).
[0052]
The rough-formed square steel pipe 5 carried out from the second heating means 70 is hot-formed by the square steel pipe forming means 75. That is, as shown in FIGS. 2, 10, and 11 (c), the roughly formed rectangular steel pipe 5 having a large outer dimension D is formed by drawing the heated roughly formed rectangular steel pipe 5 with the group of flat rollers 76. Can be hot-formed into a square steel pipe 7 having the desired product outer dimension d.
[0053]
As a result, the roughly formed square steel pipe 5 heated by the second heating means 70 can be hot-formed into the square steel pipe 7 by the square steel pipe forming means 75, and the outer surface 7b of the square steel pipe 7 extends over the entire length. While being able to become flat shape, it can be set as the shape which formed in the target location B the thickening part 8 of the thickening part thickness T which protruded thickly in the ring shape only inside. In addition, the square steel pipe 7 hot-formed by the square steel pipe forming means 75 can be naturally cooled in a cooling bed or the like.
[0054]
And the square steel pipe 7 which is a product is used for a support | pillar, for example, as shown in FIG. 12, FIG. 13, the beam material 100 is used as a beam material connection position (beam material connection part) of 1 set of 2 places. Are joined by welding 105. Here, the beam member 100 is made of H-shaped steel including an upper flange portion 101, a lower flange portion 102, and a web portion 103.
[0055]
At that time, the end surface (weld joint surface) on the welding side in the beam member 100, that is, the end surface of the upper flange portion 101, the lower flange portion 102, and the web portion 103 is because the outer surface 7b of the square steel pipe 7 is flat. It is formed on the straight end faces 101a, 102a, 103a. As a result, the end face of the beam member 100 may be cut, and the processing can be omitted. Thus, the manufacturing of the beam member 100 can be simplified and the cost can be reduced.
[0056]
In the welding 105 of the beam member 100 having such linear end surfaces 101a, 102a, 103a, the outer surface 7b of the portion where the thickened portion 8 exists is used as a beam member connecting position (beam member connecting portion), and the beam is connected to the outer surface 7b. This is performed with the end faces 101a, 102a, 103a being applied. At that time, as described above, the outer surface 7b of the thickened portion 8 has a flat shape over the entire length, so that there is almost no gap between the both 5, 100, and good welding (connection) is efficiently performed. It can be performed well and the welding accuracy and strength can be improved.
[0057]
Further, since the outer surface 7b of the square steel pipe 7 is flat, a corner portion formed by the outer surface 7b and the upper surface of the upper flange portion 101 is formed at a right angle. The floor slab (deck plate) 107 placed on the upper flange portion 101 can be close to the outer surface 7b of the square steel pipe 7 at the same level as the upper surface of the beam. It is not necessary to prepare a separate product formed along the R-shaped portion, the construction time is greatly shortened, and a high-quality floor slab 107 can be secured. As a result, the overall cost can be reduced.
[0058]
Next, a second embodiment of the present invention will be described with reference to FIG.
That is, the square steel pipe 7 is set as a beam material connecting position (beam material connecting portion) by forming a set of thickened portions 8 at three locations. According to this, welding 105 of the strong shaft beam member 100 can be performed in a state where the upper flange portion 101 and the lower flange portion 102 are applied to the outer surface 7b of the portion where the upper and lower thickened portions 8 are present. Further, the weak shaft beam material 100A can be welded 105 in a state where the upper flange portion 101A and the lower flange portion 102A are applied to the outer surface 7b of the portion where the upper and middle thickening portions 8 are present.
[0059]
Next, a third embodiment of the present invention will be described with reference to FIG.
That is, by setting the pitch of the predetermined interval P with respect to the rough-formed square steel pipe 5 to be short, the target location B is set as one location (at least one location) in the longitudinal direction A, and the thickened portion 8 is replaced with the beam material coupling portion. The length L is formed.
[0060]
According to the third embodiment, the beam member 100 can be welded 105 in a state where all of the upper flange portion 101, the lower flange portion 102, and the web portion 103 are opposed to the thickened portion 8, and thus strong. Welding connections can be made.
[0061]
Next, a fourth embodiment of the present invention will be described with reference to FIG.
That is, the square steel pipe 7 forms a pair of thickened portions 8 at two locations, and forms an intermediate thickened portion 9 between the thickened portions 8, thereby providing a beam material coupling position (beam material coupling portion). Yes. At that time, the thickened portion thickness T is 2.5 to 5.0 times the thickness t, and the intermediate thickened portion thickness Tt is the difference between the thickness t and the thickened portion thickness T. In other words, [t <Tt <T].
[0062]
According to the fourth embodiment, welding 105 of the beam member 100 can be performed in a state where all of the upper flange portion 101, the lower flange portion 102, and the web portion 103 are opposed to the thickened portions 8 and 9. And a strong weld connection can be achieved.
[0063]
In the above-described embodiment, the compression force cylinder device 59 is employed to obtain the compression force, but this may be a screw feed type or the like.
In the above-described embodiment, the roughly formed rectangular steel pipe 5 formed with the thickened portion 8 is heated as uniformly as possible by the second heating means 70 (for example, heated at a temperature exceeding the A3 transformation point). It is possible to remove the stress generated inside the pipe, recover the remarkable deterioration of the material due to processing, and obtain a high-quality square steel pipe (product) 7 by homogenizing the performance. When used, the stress is smoothly transferred from the thickened portion 8 to the main body portion of the square steel pipe 7 at the time of an earthquake, and coupled with the advantage of the thickened shape of the square steel pipe 7, further absorption of earthquake energy Can be expected.
[0064]
In the above-described embodiment, heating is performed by one first heating unit 60. However, this may be a form in which heating is performed by one or more first heating units. Further, the first heating unit 60 may be provided with auxiliary heating units.
[0065]
In the above-described embodiment, a roller squeeze type in which a large number of flat rollers 76 are arranged as the square steel pipe forming means 75 is adopted, but this may be a press type.
[0066]
【The invention's effect】
  According to claim 1 of the present invention described above,A rough-formed square steel pipe can be formed by bending a steel sheet and then butt welding. First, in a state in which the receiving carriage and the push carriage are moved apart (retracted) from each other, the rough-formed square steel pipe before partial thickening is placed on the support means. And after arranging the receiving side clamping device, the pushing side clamping device, the first heating means and the outer surface regulating means on the rough formed square steel pipe, the receiving carriage and the pushing carriage are moved closer to each other (forward movement), One end of the rough-formed square steel pipe is brought into contact with the front surface of the pressurizing body, whereby the rough-formed square steel pipe can be positioned. In this state, the rough-formed square steel pipe can be set by clamping the rough-formed square steel pipe from inside and outside with the receiving-side clamp device and the push-side clamp device.
  In the state set in this way, the first heating means can locally heat the target location of the rough formed square steel pipe, and then the compressive force applying means can apply a longitudinal compressive force to the heating location, The outer surface of the heating location can be regulated by the outer surface regulating means. In this case, the compressive force can be obtained by moving the main carriage closer to the base body and thus moving the push side clamping device closer to the receiving side clamping device. Due to this compressive force, in the part facing the first heating means, a part of the material of the heating part is sequentially increased in thickness toward the inner surface side, and a desired amount inward from the one end surface of the rough formed square steel pipe to a predetermined distance. A thickened portion protruding in a ring shape can be formed. And after heating the whole rough formed square steel pipe by the second heating means, hot forming into the square steel pipe by the square steel pipe forming means,Projections on the outer surface of the thickened beam connectionnot existSquare steel pipeCan be easily manufactured.
  thisWelding of beam members when using a square steel pipe, for example, as a support, is performed with the outer surface of the portion where the thickened portion is present as the beam material connection position (beam material connection part) with the end face of the beam material applied. be able to. At that time, the outer surface is flattened over the entire length, so that the end face (welded joint surface) of the beam material can be cut and no special processing is required, and the outer surface of the thickened part Since there is almost no gap between the beam and the end face of the beam material, good welding (connection) can be efficiently performed, and welding accuracy and strength can be further improved.
[0067]
Further, by making the outer surface flat, a corner portion formed by the outer surface of the square steel pipe and the upper surface of the upper flange portion of the beam material is formed at a right angle, and therefore, the floor placed on the beam material The plate can be close to the outer surface of the column (square steel pipe) at the same level as the upper surface of the beam. Therefore, it is also necessary to prepare a separate plate with the end formed along the R-shaped portion as the floor plate. In addition, the construction time can be greatly reduced, and a high-quality floor slab can be secured. As a result, the overall cost can be reduced.
[0068]
Moreover, by hot forming over the entire length, a square steel pipe having a uniform entire cross-section and high toughness can be formed over the entire length. Furthermore, since the thickened portion exists, stress can be transmitted smoothly during an earthquake, and a square steel pipe suitable for earthquake resistance design can be obtained. And, by using a rough-formed square steel pipe having a corner R portion larger than a predetermined dimension as a raw tube, the corner R portion has the same thickness as the flat plate portion even if the entire cross section is heated and then processed by hot forming. Can increase the thickness.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is an explanatory diagram of a pipe making process in a square steel pipe manufacturing facility according to a first embodiment of the present invention.
FIG. 2 is an explanatory diagram of processes from thickening to hot forming in the manufacturing equipment for the rectangular steel pipe.
FIG. 3 is a partially cutaway side view showing a state in which a roughly formed square steel pipe is set at a compressive force applying means portion in the manufacturing equipment for the same square steel pipe.
FIG. 4 is a partially cutaway side view of the compressive force applying means portion in the manufacturing equipment for the same square steel pipe, when the target portion is heated.
FIG. 5 is a partially cutaway side view of the compressive force imparting means portion in the manufacturing equipment for the same square steel pipe during a thickening action.
FIG. 6 is a partially cutaway side view at the time of cooling in a compressive force applying means portion in the manufacturing equipment for the same square steel pipe.
FIG. 7 is a partially cutaway side view showing a compressive force applying means portion in the manufacturing equipment for the same square steel pipe, when the next target portion is heated.
FIG. 8 is a compressive force applying means portion in the manufacturing equipment for a rectangular steel pipe, wherein (a) is a longitudinal side view of the main part during heating to the target location, and (b) is a vertical side view of the main part during the thickening action. (C) is a vertical side view of the main part at the time of a cooling action.
FIG. 9 is a longitudinal side view of a main part of a roughly formed square steel pipe whose thickness has been increased by the same square steel pipe manufacturing equipment.
FIG. 10 is a longitudinal sectional side view of a main part during hot forming in a square steel pipe forming means portion in the manufacturing equipment for the same square steel pipe.
FIGS. 11A and 11B show changes in pipes in the same square steel pipe manufacturing equipment, wherein FIG. 11A is a longitudinal front view of a rough-formed square steel pipe, FIG. 11B is a vertical front view of a thick-formed square steel pipe, and FIG. It is a vertical front view of the hot-formed square steel pipe.
FIG. 12 is a longitudinal side view of a square steel pipe manufactured by the same square steel pipe manufacturing facility in a state in which the beam material is welded.
FIG. 13 is a cross-sectional plan view of a square steel pipe manufactured by the same square steel pipe manufacturing facility in a state in which a beam material is welded.
FIG. 14 shows a second embodiment of the present invention and is a longitudinal side view in a state where a square steel pipe manufactured by a square steel pipe manufacturing facility is in use and a beam material is welded.
FIG. 15 shows a third embodiment of the present invention, and is a longitudinal side view of a square steel pipe manufactured by a square steel pipe manufacturing facility in a state in which a beam is welded.
FIG. 16 shows a fourth embodiment of the present invention and is a longitudinal side view in a state where a square steel pipe manufactured by a square steel pipe manufacturing facility is in use and a beam material is welded.
[Explanation of symbols]
1 Steel plate
5 Coarse formed square steel pipe
5a inner surface
5b outer surface
5A square steel pipe
6 Butt weld
7 Square steel pipe (product)
7b exterior
8 Thickening part
9 Middle thickness increase part
10 Manufacturing equipment
11 Pipe making means
12 Groove processing machine
13 Pre-forming press
14 Subsequent forming press
15 Tack welding machine
16 Internal welder
17 External welder
18 Support means
20 Compression force applying means
21 Receiving device
24 trolley
27 Forward / reverse drive unit
28 Pressure receiver
30 Clamping device on the receiving side
31 Inner clamp
35 Outer clamp
41 Pusher
43 Main cart
45 push cart
48 Forward / reverse drive
49 Pressurized body
50 Push side clamping device
51 Inner clamp
55 Outer clamp
59 Cylinder device for compression force
60 First heating means
61 Mobile device
65 Cooling means
67 External control means
68 Regulatory Department
68a Straight regulation surface
68b Inclined regulating surface
70 Second heating means
75 Square steel pipe forming means
76 Flat roller
100 Beam material (Strong shaft beam material)
100A Weak shaft beam material
101 Upper flange
101A Upper flange
102 Lower flange
102A Lower flange
103 Web part
103A web part
105 Welding
107 floor slab
A Longitudinal direction
B Target location (heating location)
C Set distance
P Predetermined interval
D External dimensions of rough formed square steel pipe
d Product outside dimensions
R Corner radius of rough formed square steel pipe
r Corner radius of square steel pipe
T Thickening thickness
t thickness
Tt Middle thickness increased thickness
W Heating width
V Thickening length
L Length to form the beam connecting part

Claims (1)

The purpose of the tube forming means for forming a roughly formed square steel pipe approximate to a regular size and shaped square steel pipe by bending the steel sheet and then butt welding, and the purpose of the rough formed square steel pipe supported by the support means The first heating means for heating the part, the compressive force applying means for applying a compressive force in the longitudinal direction of the roughly formed rectangular steel pipe to the heated part to increase the thickness of a part of the heated part, and the outer surface of the heated part are regulated. The outer surface regulating means, the second heating means for heating the whole of the rough-formed square steel pipe formed with the thickened portion at the target location, and the rough-formed square steel pipe whose whole was heated to a predetermined temperature, Consists of square steel pipe forming means for hot forming into square steel pipes whose outer surfaces are flattened over the entire length, with the dimensions between the outer faces and the radius of each corner being smaller than the dimensions and radius of the rough-formed square steel pipe is, the compressive force applying means It comprises a receiving device in which one end surface of a rough-formed square steel pipe can freely come into contact and a pushing device in contact with the other end surface of the rough-formed square steel pipe. The receiving device is provided on a base body and the base body. A receiving carriage, a pressure receiving body erected on the receiving carriage side, and a receiving side clamp device provided between the pressure receiving body and the base body side. The pushing device is a main body provided on the floor. A carriage, a push carriage provided on the main carriage, a pressurization body standing on the push carriage, and a push-side clamp device provided between the pressurization body and the main carriage side The receiving-side clamping device and the pushing-side clamping device are configured to clamp the roughly formed square steel pipe from inside and outside, respectively, and the first heating means and the outer surface regulating means are provided between the receiving device and the pushing device. It is characterized in that the bets are provided Manufacturing facilities of the square tube.

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