JP5157759B2 - Square steel pipe member - Google Patents

Description

  The present invention relates to a rectangular steel pipe member used as a structural member in a building structure.

  2. Description of the Related Art Conventionally, square steel pipes are widely used as structural members that constitute columns, beams, and the like in steel structures having beams, columns, and the like. And conventionally, various square steel pipe members constructed so that the end of the square steel pipe can be joined to other structural members by attaching other members to the end of the square steel pipe or performing various processes. Proposed.

  FIG. 17 (a) is a perspective view showing a configuration of a joint structure 100 in which a conventionally proposed square steel pipe member 110 is joined to a beam member 103, and FIG. 17 (b) is an exploded perspective view thereof. FIG. 17C is a plan sectional view thereof. This square steel pipe member 110 has a square joining plate 105 having a shape corresponding to the cross-sectional shape of the square steel pipe constituting the square steel pipe 101 and a pair of L-shaped angle members 107 at both ends of the square steel pipe 101. And an end plate 109 in which a plurality of bolt holes 109a are formed are sequentially fixed by welding. The square steel pipe member 110 is joined to the beam member 103 by bolting the end plate 109 to the column member 103.

  Here, the pair of angle members 107 are arranged so as to have a cross shape in plan view. Thus, a fastening work space 111 in which a part of a fastening tool such as a socket wrench or a socket of an impact wrench can be arranged is formed between the joining plate 105 and the end plate 109. Thereby, even when the size of the end plate 105 cannot be made larger than the size of the square steel pipe 101 or the beam member 103, it is easy to secure the fastening work space 111 for fastening the bolts and nuts.

  In addition to this, for example, as disclosed in Patent Document 1, the end of a column made of a square steel pipe is narrowed down to a small diameter by swaging, and this is made into a circular cross section, so that the end of the column A square steel pipe member has been proposed in which a fastening work space for fastening bolts and nuts is formed on the outside.

  Moreover, in patent document 2, the end part of the pillar which consists of square steel pipes is crushed by press work so that it may become predetermined | prescribed shapes, such as cross-sectional substantially cross shape, and the space for fastening work of a bolt nut outside the edge part of a pillar There has been proposed a square steel pipe member in which is formed.

Japanese Utility Model Publication No. 3-115717 Japanese Patent Laid-Open No. 10-292556

  However, since the square steel pipe member 110 shown in FIG. 17 has a discontinuous cross section between the square steel pipe 101 and the pair of angle members 107, stress concentration occurs even through the joining plate 105, and the square steel pipe member 110 has a rectangular shape. The performance of the steel pipe 101 cannot be exhibited sufficiently. Further, in order to weld the entire circumference of the pair of angle members 107, it is necessary to weld intricate parts, which is troublesome, and the joining plate 105 may be distorted by welding. Becomes difficult.

  In addition, when the techniques disclosed in Patent Documents 1 and 2 are used, it is necessary to adjust the length in the axial direction while changing the cross section of the square steel pipe member, and a plane is used to weld the end surface to the end plate. In reality, it is necessary to finish the end face, which takes time and effort.

  In other words, conventionally, a square steel pipe member having a low workability has not been proposed which can relax the influence of stress concentration while securing a space for fastening work of bolts and nuts, facilitates assembly work by welding.

  Therefore, the present invention has been devised in view of the above-described problems, and the object of the present invention is a square steel pipe member to be joined to another structural member, and a bolt and nut fastening operation An object of the present invention is to provide a square steel pipe member that can alleviate the influence of stress concentration while ensuring a space for use, is easy to assemble by welding, and has a low workability.

  In order to solve the above-described problems, the present inventors have devised the following invention after intensive studies.

RHS member according to claim 1, a square tube, welded joint profile angle shape provided on one axial end side of the cylindrical joint body, welded are butted ends of the square tube steel comprising a manufacturing hollow join DOO, said steel hollow joint, the joint is provided on the other axial end side of the body, the plate joint end plate bolt holes are formed with a plurality for the end of the other end face is welded And the steel hollow joint has in its axial direction a straight pipe region R1 that is substantially the same vertical cross section as the square steel pipe from the weld joint in the axial direction, and the weld is adjacent to the region R1. It has a region R2 formed so that its vertical cross-sectional area continuously narrows in the axial direction as compared to the joint portion , and has substantially the same vertical cross section adjacent to the region R2 up to the plate joint portion in the axial direction. A straight pipe area 3, characterized in that it comprises in the axial direction.

A square steel pipe member according to a second aspect is the invention according to the first aspect, wherein the joint body of the steel hollow joint is formed integrally.

RHS member according to claim 3, characterized in that in the invention according to claim 1 or 2, and the RHS and welded joint of the steel hollow joint, which is welded to a plate interposed therebetween And

RHS member according to claim 4 is the invention according to any one of claims 1 to 3, the plate joining portion of the steel hollow joint, the four corners of the rectangular cross section in which the weld joint is formed In the corresponding part, it is characterized in that it is narrower on the inside than the weld joint.

RHS member according to claim 5 is the invention according to claim 1, 2 or 4, wherein the steel hollow joint, at one end of the joint body, narrower inside than the weld joint formed is, the insertion portion to insert in fitted into the square tube as the backing, characterized in that it is welded to the square tube.

The square steel pipe member according to a sixth aspect is the invention according to any one of the first to fifth aspects, wherein the square steel pipe is used as a beam or a diagonal member.

  According to the square steel pipe member according to the first aspect of the present invention, the space for fastening work of the bolt and nut is obtained, and the cross section can be widely secured outside the shaft center. In addition, since the steel hollow joint, which is a separate member, is attached to the end of the square steel pipe, only the steel hollow joint can be thinned with high strength. Therefore, it is possible to reduce the weight while obtaining the above. Moreover, since the square steel pipe member which concerns on Claim 1 has few parts protruded outside other than an end plate, it does not become an obstacle at the time of attaching finishing materials etc., but the freedom degree of design is improving. In addition, since the square steel pipe and the steel hollow joint have the same hollow square cross section, it is possible to suppress the influence of an increase in weld line and stress concentration.

  According to the invention according to claim 2, since it is obtained by integral molding without using welding, there is no adverse effect on the strength due to finish dimensional accuracy, welding distortion, and there is no cutting line in the appearance, so that the design property It is also excellent from the point of view.

  According to the invention of claim 3, since the plate is interposed between the steel hollow joint and the square steel pipe, the dimensional accuracy of each of the square steel pipe and the steel hollow joint can be relaxed.

  According to the invention which concerns on Claim 4, it becomes possible to ensure four space for fastening work, ensuring the cross-sectional secondary moment of a plate junction part comparatively large.

  According to the invention which concerns on Claim 5, the insertion part serves as the positioning means and the backing, and has excellent workability.

  Hereinafter, as a best mode for carrying out the present invention, a rectangular steel pipe member used as a structural member in a building structure will be described in detail with reference to the drawings.

  First, a first embodiment of a square steel pipe member to which the present invention is applied will be described.

  FIG. 1 is a perspective view showing a joining structure 2 in which an end 1a of a square steel pipe member 1 to which the present invention is applied is joined to a column member 3 made of H-shaped steel. In the present embodiment, pillar members 3 extending in the vertical direction are provided with a space left and right, and end portions 1a on both sides of a rectangular steel pipe member 1 extending in the horizontal direction are joined to these. This will be described as an example.

  The joining structure 2 using the square steel pipe member 1 according to the present invention is a structural member extended in two different directions, the end 1a of the square steel pipe member 1 as one structural material, and the other column member 3 Is used at the intersection 9 where. This square steel pipe member 1 is used, for example, as an oblique member as described later, in addition to the case where it is used as a beam member in a building structure as in the present embodiment.

  If the other column member 3 joined to this square steel pipe member 1 is configured to be capable of bolting them by abutting an end plate 31 provided at an end 1a of the square steel pipe member 1. Good. Examples of the column member 3 include a shape steel member having various cross-sectional shapes such as an H-shaped steel, an L-shaped steel, a C-shaped steel, and a box-shaped steel, and a plate-shaped member such as a steel plate.

  FIG. 2 is a perspective view of the square steel pipe member 1. 3 is an enlarged perspective view of an end 1a of the rectangular steel pipe member 1 of FIG. 2, and FIG. 4 is an exploded perspective view thereof.

  The square steel pipe member 1 includes a square steel pipe 5 used as a beam, and steel hollow joints 4 welded to both ends 5a of the square steel pipe 5. The square steel pipe 5 is formed in a square cross section, and the cross section may be formed in a square cross section as shown in FIG. It may be formed.

  FIG. 5 shows the structure of a steel hollow joint 4 that constitutes a part of the square steel pipe member 1, wherein (a) is a perspective view thereof, (b) is a plan view thereof, and (c) is a sectional view thereof. It is AA sectional view taken on the line of (a). 6A shows a plan view in FIG. 3, and FIG. 6B is a plan view of the square steel pipe member 1 in which the end plate 31 is not fixed from FIG.

  As shown in FIG. 5, the steel hollow joint 4 is composed of a joint body 10 formed in a tubular shape as a whole, and includes a weld joint 11 provided on one end side 10 a in the axial direction of the joint body 10. The plate joint part 13 provided on the other end side 10b in the axial direction of the joint body 10 and the reduced diameter part 17 provided between the weld joint part 11 and the plate joint part 13 are provided. The steel hollow joint 4 is formed by hydroform molding, press molding, or the like, which will be described later.

  As shown in FIG. 5A, the steel hollow joint 4 includes a cross-sectional shape of a region R1 from one end side 10a end of the joint body 10 to the other end side 10b, and the other end side of the joint body 10. The cross-sectional shape of the region in the range R3 from the end portion 10b to the one end side 10a is substantially uniform. The shape of the part of the range R2 located between the part of the range R1 and the part of the range R3 is a cross-section of the part of the range R1 as it goes from the one end side 10a end of the joint body 10 to the other end side 10b end. It gradually narrows toward the axis G so as to approach the cross-sectional shape of the region R3 from the shape. In the example of FIG. 5, the inclined surface 16 is formed so as to approach the side surface portion 14b of the square cross section of the range R3 from the corner 12a of the square cross section of the range R1 in the region of the range R2, and the square cross section of the range R3. From the corner portion 14a to the side surface portion 12b of the square cross section in the range R1, it is formed so as to be positioned on substantially the same plane. In this specification, the region R1 is treated as the weld joint 11, the region R2 is treated as the reduced diameter portion 17, and the region R3 is treated as the plate joint 13.

  As shown in FIGS. 3 and 4, the plate joint portion 13 has one surface side of a flat end plate 31 in which a plurality of bolt holes 33 are formed with respect to the end surface 13 a on the other end side 10 b of the joint body 10. They are abutted and fixed by welding.

  As shown in FIG. 3 and FIG. 4, the weld joint 11 has an end surface 5 b at one end of the square steel pipe 5 abutted against an end surface 11 a located on one end side 10 a of the joint body 10. Used by being fixed by welding. As shown in FIG. 3, after the weld joint 11 of the steel hollow joint 4 and the end 5 a of the square steel pipe 5 are fixed, the weld joint 11 and the end 5 a of the square steel pipe 5 are connected. A weld bead 35 is formed between them.

  As shown in FIG. 3 and FIG. 6B, the weld joint 11 has a shape corresponding to the shape of the square steel pipe 5, and is adjusted to have substantially the same cross-sectional shape as the square cross section formed by the square steel pipe 5. Has been. Thereby, the square steel pipe member 1 can suppress the part which protrudes outside rather than the outer periphery of the square steel pipe 5 from the intermediate part 5c of the square steel pipe 5 to the end plate 31 as shown in FIG. (If the welding surplus is cut off, the protruding portion can be eliminated), so that it does not become an obstacle when attaching a finishing material or the like to the square steel pipe member 1, and the degree of freedom in design is improved. In addition, the square steel pipe member 1 is configured to fix the weld joint 11 directly to the end 5a of the square steel pipe 5 by welding without sandwiching the member between the weld joint 11 and the end 5a of the square steel pipe 5. Therefore, the increase in the number of parts can be suppressed, and the welding location and the total weight are reduced.

  As shown in FIGS. 5 (b) and 5 (c), the plate joint portion 13 is rotated approximately 45 degrees from the corner portion 12 a formed by the square cross section of the weld joint portion 11 about the axis G of the joint body 10. It is formed in a square cross section having a corner 14a at the position. In the present embodiment, any cross-sectional shape of the weld joint 11 and the plate joint 13 is formed in a substantially square shape.

  As shown in FIGS. 5A to 5C, the plate joint portion 13 is formed narrower on the inner side than the weld joint portion 11 at a predetermined portion. As shown in FIG. 5C, this is because the cross-sectional shape of the plate joint 13 when viewed from the axial direction of the joint body 10 is smaller than the cross-sectional shape of the weld joint 11. It means that it is formed narrower in the axis G of the joint body 10 than the cross-sectional outline of the part 11.

  As shown in FIG. 6A, the narrowed portion of the plate joint portion 13 is a portion corresponding to the bolt hole 33 formed in the end plate 31. In this embodiment, bolt holes 33 are formed near the corners of the four corners of the substantially square end plate 31, and the plate joint 13 is welded so that a space is provided near the bolt holes 33. It is formed narrower than the inside.

  As a result, as shown in FIGS. 3 and 6A, a bolt inserted into the bolt hole 33 of the end plate 31 between the end plate 31 and the inclined surface 16 of the reduced diameter portion 17 or a screw threaded into the bolt hole 33 is provided. A fastening work space 18 that facilitates the fastening work of the nut to be joined is formed. In the fastening work space 18, when fastening the bolts and nuts, an operator can use them to manually place the bolts and nuts, or place a part of a fastening tool such as a socket wrench or impact wrench socket. Can be.

  The degree to which the shape of the plate joint 13 is narrowed may be a space provided by the narrowing, and may be adjusted to such an extent that the bolt nut used in the bolt hole 33 of the end plate 31 can be fastened.

  Next, the work procedure in the case of joining the end 1a of the square steel pipe member 1 having such a configuration to the column member 3 will be described.

  First, at the factory, the end plate 31 is welded to the end surface 13a of the plate joint 13 of the steel hollow joint 4 in advance, and the steel hollow joint 4 is welded to the end surfaces 5b at both ends of the square steel pipe 5. The end surface 11a of the part 11 is abutted and these are welded, and the square steel pipe member 1 is prepared. Thereafter, at the construction site, the end plate 31 of the rectangular steel pipe member 1 is brought into contact with the flange 3a of the column member 3 made of H-shaped steel as shown in FIG. The end plate 31 and the flange 3a of the column member 3 are joined by bolts, whereby the end 1a of the square steel pipe member 1 and the column member 3 are joined.

  The effect of the square steel pipe member 1 having such a configuration will be described.

  In the steel hollow joint 4 constituting a part of the rectangular steel pipe member 1 in the present invention, the plate joint portion 13 of the joint body 10 formed in a cylindrical shape corresponds to the position of the bolt hole 33 of the end plate 31. In this configuration, the space 18 for tightening bolts and nuts is formed between the end plate 31 and the inclined surface 16 of the reduced diameter portion 17. It is said that. The rectangular steel pipe member 1 having the steel hollow joint 4 configured as described above has a shape capable of ensuring a wide cross section outside the shaft center G while obtaining a bolt / nut fastening space 18. Moreover, since it is set as the structure which attaches the steel hollow joint 4 of another member to the edge part 5a of the square steel pipe 5, only the steel hollow joint 4 can be made thin with high intensity | strength. For this reason, according to the square steel pipe member 1 in the present invention, it is possible to reduce the weight while obtaining the space 18 for fastening the bolts and nuts.

  Moreover, since the square steel pipe member 1 in the present invention has a hollow square cross section substantially the same as the welded joint 11 of the steel hollow joint 4 and the square steel pipe 5 to which it is welded, the influence of an increase in weld line and stress concentration Can be suppressed.

  In addition, the square steel pipe member 1 in the present invention has a smaller number of members than the square steel pipe member 110 shown in FIG. 17, and the assembly work is completed with a small number of weldings, so that it is not necessary to weld the complicated parts. It is excellent in terms of the time and cost required for.

  Next, 2nd Embodiment of the square steel pipe member in this invention is described. In addition, about the component same as the component mentioned above, the description below is abbreviate | omitted by attaching | subjecting the same code | symbol.

  FIG. 7 is a perspective view showing a configuration of a square steel pipe member 1A of the second embodiment, FIG. 8 is an enlarged perspective view of an end 1a of the square steel pipe member 1A of FIG. 7, and FIG. 9 is an exploded view thereof. It is a perspective view.

  Compared to the square steel pipe member 1 shown in FIG. 2, this square steel pipe member 1 </ b> A is provided between the end 5 a of the square steel pipe 5 and the weld joint 11 of the steel hollow joint 4 as shown in FIG. 9. The difference is that the joining plate 37 is interposed.

  The joining plate 37 is made of a plate-like member such as a steel plate. As shown in FIGS. 8 and 9, the one side 37 a of the joining plate 37 is abutted against the end face 11 a of the weld joint 11 of the steel hollow joint 4 and fixed by welding, and the other side 37 b is square. It is abutted against the end surface 5b of the steel pipe 5 and fixed by welding.

  Thus, when it is set as the structure welded to the joining plate 37 interposed between the steel hollow joint 4 and the square steel pipe 5, relative dimension control in the end surface of the square steel pipe 5 and the steel hollow joint 4 is carried out. Therefore, the dimensional accuracy of each cross-sectional shape can be relaxed, and the influence of variations in the cross-sectional shape of each manufacturing manufacturer and manufacturer can be mitigated.

  Next, 3rd Embodiment of the square steel pipe member in this invention is described.

  FIG. 10 shows a perspective view of a rectangular steel pipe member 1B of the third embodiment. This square steel pipe member 1B is different from the square steel pipe member 1A shown in FIG. 7 in the shape of a steel hollow joint.

  FIG. 11 shows the structure of a steel hollow joint 4A used in a rectangular steel pipe member 1B as the third embodiment, (a) is a perspective view thereof, (b) is a plan view thereof, (c) ) Shows a cross-sectional view taken along line BB in FIG.

  The steel hollow joint 4A is different from the steel hollow joint 4 shown in FIG. 5 in that the cross-sectional shape of the plate joint 13 is formed in a circular cross-section. As shown in FIG. 11, the plate joint 13 in the steel hollow joint 4 </ b> A according to the present embodiment has a diameter of a circle formed by a circular cross section thereof, and a side length formed by a square square cross section of the weld joint 11. A little shorter than that.

  Like these steel hollow joints 4, 4 </ b> A, the plate joint portion 13 is narrower on the inside than the weld joint portion 11 at a portion corresponding to the four corner portions 12 a of the square cross section formed by the weld joint portion 11. Preferably it is formed. As a result, it is possible to secure four fastening work spaces 18 while securing a relatively large cross-sectional secondary moment of the plate joint 13.

  Further, the steel hollow joints 4 and 4A according to the present invention are formed such that the shape of the plate joint portion 13 is narrower on the inner side than the weld joint portion 11 at least at a portion corresponding to the position of the bolt hole 33 of the end plate 31. As long as it is formed, the portion not corresponding to the bolt hole 33 may be formed narrower on the inner side than the weld joint portion 11. For this reason, about the cross-sectional shape of the plate junction part 13, it does not specifically limit to the above-mentioned shape, What kind of things, such as a cross-sectional triangle shape, cross-sectional polygonal shape, and an indefinite cross-section shape, may be sufficient.

  FIG. 12 is a perspective view showing a state in which the square steel pipe member 1 according to the present invention is used as an oblique material. As shown in FIG. 12, the square steel pipe member 1 according to the present invention may be used as an oblique member that is disposed to be inclined with respect to the column member 3 or the beam member 6.

  In this case, in the vicinity of the corner 41 where the column member 3 and the beam member 6 intersect, one end side is fixed to the column member 3 by welding or the like, and the other end side is made of a steel plate or the like fixed to the beam member 6 by welding or the like. By providing the inclined plate 7, the end plates 31 at both ends of the rectangular steel pipe member 1 are brought into contact with the inclined plate 7, and these are bolted together, so that the rectangular steel pipe member 1 is attached as an oblique material.

  Incidentally, in a portion surrounded by the inclined plate 7, the column member 3, and the beam member 6, as shown in FIG. 12, a reinforcing rib 8 made of a substantially triangular steel plate or the like is provided with respect to the inclined plate 7 or the like. It is fixed by welding.

  In addition, when attaching the square steel pipe member 1 as an oblique material, the structure for attaching the both ends of the square steel pipe member 1 to a structural member is not limited to this.

  In addition, if the example of the dimension of the square steel pipe member 1 grade | etc., Which concerns on this invention is demonstrated, the height of the square steel pipe member 1 shown by FIG. 2 shall be 1900 mm. The square steel pipe 5 has a substantially square cross section with a side of 60 mm and a plate thickness of 3.2 mm. Further, the steel hollow joint 4 shown in FIG. 5 has a welded joint portion 11 having a substantially square cross section with a side of 60 mm, and a plate joint portion 13 having a substantially square cross section with a side of 45 mm. The height is 60 mm. Further, the end plate 31 shown in FIG. 3 or the like has a substantially square shape with a side of 100 mm, and its plate thickness is 9 mm. Further, in the column member 3 made of H-section steel shown in FIG. 1, the flange 3a has a width of 100 mm and the web 3b has a height of 100 mm. Further, the joining plate 37 shown in FIG. 7 has a substantially square shape with a side of 63 mm and a plate thickness of 9 mm. Further, the steel hollow joint 4A shown in FIG. 7 is substantially the same as the steel hollow joint 4A shown in FIG. 5 except that the weld joint 11 has a substantially square cross section with a side of 58 mm. Moreover, the steel hollow joint 4A shown in FIG. 11 is substantially the same as the steel hollow joint 4 shown in FIG. 5 except that the plate joint has a substantially circular shape with a diameter of 50 mm. These dimensions are shown only as an example, and the present invention is of course not limited to these dimensions.

  Next, the manufacturing method of the steel hollow joints 4 and 4A used for the above-mentioned square steel pipe member 1 is demonstrated.

  The steel hollow joints 4 and 4A according to the present invention are manufactured, for example, by hydroform molding, press molding, or the like, but are preferably manufactured by integral molding such as hydroform molding. Below, an example of the method of manufacturing the steel hollow joint 4A shown by FIG. 11 by hydroforming is demonstrated.

  FIG. 13 (a) is a side cross-sectional view schematically showing the configuration of a hydroform molding apparatus 50 that can realize the method for manufacturing the steel hollow joint 4A in the present invention.

  The hydroform molding apparatus 50 includes a set of split molds 51 and 52 for hydroform, and a shaft pressing punch 55 that enables the material pipe 57 disposed between the split mold 51 and the split mold 52 to be axially pressed from both ends. And. In the present specification, the split mold 51 disposed on the upper side is referred to as the upper mold 51, and the split mold 52 disposed on the lower side is referred to as the lower mold 52. Moreover, the material pipe | tube 57 here means the steel pipe used as the raw material of the molded article obtained after hydroforming.

  The upper mold 51 and the lower mold 52 are provided with a cavity 53 for making the material pipe 57 into a predetermined shape by hydroforming. In this example, the material tube 57 can be formed by the cavity 53 into a shape in which two steel hollow joints 4A shown in FIG. 11 are arranged in series and the end portions 10a in the axial direction are butted. As described above, the shape of the cavity 53 is adjusted. FIG. 14 shows a side cross-sectional view of the shape of a hydroform molded product 61 molded using the upper mold 51 and the lower mold 52. The resulting hydroform molded product 61 is shaped so that both sides of the axial center are symmetrical.

  The cavity 53 includes a semicircular recess 53a provided at a position corresponding to both ends of the material tube 57, a square recess 53b provided at a position corresponding to the center of the material tube 57, a semicircular recess 53a, and a square recess 53b. And an expanding recess 53c that is smoothly expanded so that the shape approaches the square from the semicircle toward the rectangular recess 53b from the semicircular recess 53a.

  When the steel hollow joint 4A is manufactured by the hydroform molding device 50, first, the material pipe 57 is disposed in the cavity 53 of the lower mold 52, and the upper mold 51 is lowered to cover the lid. Close. Next, as shown in FIG. 13B, a pressure medium 59 such as water is filled in the material pipe 57 by a pressure medium filling means (not shown), and the pressure medium 59 is used to fill the material pipe 57 from the inside. In addition to applying hydraulic pressure toward the outside, the material tube 57 is axially pressed from both ends of the material tube 57 by the axial press punch 55 to apply a compressive load, and hydroform molding is performed by axial pressing and application of hydraulic pressure. .

  13C shows a cross-sectional view taken along the line CC and EE of FIG. 13B, and FIG. 13D shows a cross-sectional view taken along the line FF of FIG. 13B. ing. As shown in this figure, both ends of the material tube 57 are formed in a circular cross section by the semicircular recess 53a of the cavity 53 of the upper die 51 and the lower die 52 by hydroforming, and the center of the material tube 57 is formed. The portion is formed in a square cross section by the rectangular recess 53 b of the cavity 53.

  Next, as shown in FIG. 14, the obtained hydroform molded product 61 is cut along a cutting line L <b> 1 indicated by a one-dot chain line so as to be divided into two at the center in the axial direction. As a result, two steel hollow joints 4A are obtained.

  As described above, when the steel hollow joints 4 and 4A according to the present invention are manufactured by hydroforming, the complexity of the steel hollow joints 4 according to the present invention is more complex than when manufactured by other forming methods. Even if it is a shape, it can be easily manufactured. In addition, the steel hollow joints 4 and 4A according to the present invention are obtained by integral molding without using welding, so there is no adverse effect on strength due to welding distortion, and there is no cutting line or the like in the appearance. From the viewpoint of sex.

  Moreover, when the hydroform molded product 61 having a shape that is symmetrical on both sides of the axial center is cut so as to be divided into two at the axial center, two steel hollow joints 4 and 4A are obtained. Two steel hollow joints 4, 4 A having the same shape can be obtained from the cavity 53 of the pair of upper mold 51 and lower mold 52, which is excellent in mass productivity. Further, in this case, because of the characteristics of hydroforming, the plate thickness can be made thicker at both ends than the center of the material tube 57, so that the plate joint is more than the weld joint 11 of the steel hollow joint 4. Since the plate thickness of 13 can be increased, distortion due to welding to the end plate 31 can be suppressed.

  Incidentally, the hydroform molded product 61 having a shape symmetrical on both sides of the axial center is cut into two parts in the axial direction at portions other than the axial center, and two steels having different heights are cut. It is good also as obtaining the hollow joint 4 made. In this case, the obtained hydroform molded product 61 is cut at a portion corresponding to the welded joint portion 11 of the steel hollow joint 4.

  The hydroform molding device 50 and the hydroform molding process described above are described as an example of a method of manufacturing the steel hollow joints 4 and 4A, and are not limited to the above-described configuration and process order. For this reason, for example, only one hollow steel joint 4, 4 </ b> A may be formed by a pair of upper mold 51 and lower mold 52, or three or more may be molded. . As shown in FIGS. 13 and 14, when two steel hollow joints 4 and 4A are obtained from the hydroform molded product 61 having a shape symmetrical on both sides of the axial center, both sides of the material pipe 57 are obtained. Thus, there is an advantage that the compressive load of the axial pressing by the axial pressing punch 55 can be made uniform, and the hydroform molded product 61 can be obtained stably.

  When three or more steel hollow joints 4 are formed by one set of the upper mold 51 and the lower mold 52, the cavity 53 of the upper mold 51 and the lower mold 52 is, for example, a steel hollow A plurality of joints 4 may be arranged in series, and the steel hollow joints 4 adjacent to each other may be adjusted to have a shape in which any one end is abutted. In this case, taking a case where a plurality of steel hollow joints 4A shown in FIG. 12 are formed as an example, the cavity 53 has a semicircular recess 53a, an expanded recess 53c, a rectangular recess 53b, and an expanded recess 53c as a unit. Such a shape is continuously provided in the axial direction.

  Further, in the hydroform molding apparatus and hydroform molding method of the present invention, any mechanism used in a known hydroform molding apparatus may be employed, and it is used in a known hydroform molding method. Any means may be adopted.

  Next, the manufacturing method of the steel hollow joints 4 and 4A according to the present invention when press molding is used will be described. Below, an example of the method of manufacturing the steel hollow joint 4 shown by FIG. 5 by press molding is demonstrated.

  First, two press-formed products 63 as shown in FIG. 15A are obtained by subjecting a plate material punched in advance to a predetermined shape by press forming. As shown in FIG. 15 (b), this press-formed product 63 has an axial direction so that the cross-sectional shape when the steel hollow joint 4 is viewed from the axial direction is symmetrical on both sides of the axis G. It consists of a shape divided along.

  As shown in FIGS. 15B and 15C, the two press-formed products 63 obtained in this way are brought into contact with the side end surfaces 63 a on both sides in the width direction, and then the boundary between the two members. Laser welding, arc welding, or other welding is performed along the portion 65 and these are fixed to each other, whereby the steel hollow joint 4 is obtained. As shown in FIGS. 15B and 15C, a weld bead 74 is formed between the two press-formed products 63 after welding.

  Thus, the steel hollow joint 4 according to the present invention can be manufactured also by press molding.

  When the end 5a of the square steel pipe 5 is welded to the weld joint 11 of the steel hollow joint 4 as in the square steel pipe member 1 shown in FIG. 2, as shown in FIG. Alternatively, groove processing may be performed on the end surface 5b of the square steel pipe 5 that is abutted against the end surface 11a of the one end side 10a, and groove welding may be performed using the groove 23 obtained.

  Further, as shown in FIG. 16 (b), the end portion 10 a of the steel hollow joint 4 is narrower on the inner side than the weld joint portion 11 of the joint body 10, and is fitted into the square steel pipe 5. It is good also as providing the insertion part 20 of the cross-sectional angle shape which can be provided. A curved step 22 is formed between the weld joint 11 and the insertion part 20 of the steel hollow joint 4.

  When the end 5 a of the square steel pipe 5 is welded to the welded joint 11 of the steel hollow joint 4 using the steel hollow joint 4 provided with such an insertion part 20, the insertion part 20 is inserted into the square steel pipe 5. The step 22 is stopped at a position distant above the end surface 5b of the square steel pipe 5, and further, the end portion 5b of the square steel pipe 5 and the step 22 It is realized by welding between the two. In the steel hollow joint 4 provided with such an insertion portion 20, the insertion portion 20 serves as both a positioning means and a backing, and is excellent in workability.

It is a perspective view which shows the joining structure which joined the edge part of the square steel pipe member with respect to the beam member. It is a perspective view which shows the structure of a square steel pipe member. It is an expansion perspective view of the edge part of the square steel pipe member shown by FIG. It is a disassembled perspective view of the square steel pipe member shown by FIG. The structure of the steel hollow joint which comprises a part of square steel pipe member is shown, (a) is the perspective view, (b) is the top view, (c) is the sectional view on the AA line of (a). FIG. (A) is a top view in FIG. 3, (b) is a top view of the square steel pipe member in the state which has not adhered the end plate. It is a perspective view which shows the structure of the square steel pipe member by which the joining plate was interposed between the steel hollow joints and the square steel pipe. It is an expansion perspective view of the edge part of the square steel pipe member shown by FIG. It is a disassembled perspective view of the square steel pipe member shown by FIG. It is a perspective view of the square steel pipe member which attached the steel hollow joint of other embodiment. FIG. 11 shows a configuration of a steel hollow joint constituting a part of the square steel pipe member shown in FIG. 10, (a) is a perspective view thereof, (b) is a plan view thereof, and (c) is a plan view of (a). It is a BB sectional view. It is a perspective view which shows the structure at the time of using a square steel pipe member as an oblique material. (A) is side surface sectional drawing which showed typically the structure of the hydroform molding apparatus used for manufacture of a steel hollow joint, (b) is the side surface cross section which shows the state in the middle of the manufacturing process of a steel hollow joint. (C) is the CC sectional view taken on the line and EE sectional view taken on the line, (d) is the DD sectional view taken on the line (b). It is a figure for demonstrating the method of obtaining two steel hollow joints from the hydrofoam molded product obtained with the hydrofoam molding apparatus. It is a figure for demonstrating an example of the method of manufacturing a steel hollow joint by press molding. (A) is side sectional drawing which shows the structure which fixed the steel hollow joint to the edge part of the square steel pipe which provided the groove | channel, (b) fixed the steel hollow joint which provided the insertion part to the square steel pipe It is side surface sectional drawing which shows the made structure. It is a figure for demonstrating a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 1A, 1B Square steel pipe member 1a End part 2 Joining structure 3 Column member 3a Flange 3b Web 4 Steel hollow joint 5 Square steel pipe 5a End part 5b End surface 5c Intermediate part 6 Beam member 7 Inclined plate 8 Reinforcement rib 9 Crossing part 10 Joint body 10a One end side 10b The other end side 11 Welded joint portion 11a End surface 13 Plate joint portion 13a End surface 18 Fastening work space 20 Insertion portion 22 Step 23 Groove 31 End plate 33 Bolt hole 35 Weld bead 37 Joint plate 41 Corner portion 50 Hydroform molding apparatus 51 Upper mold 52 Lower mold 53 Cavity 53a Semi-circular recess 53b Square recess 53c Expanding recess 55 Axial push punch 57 Material tube 59 Pressure medium 61 Hydroform molded product 63 Press molded product 63a Side end surface 100 Joining structure 101 square steel pipe 103 beam member 105 joining plate 1 7 angle members 109 end plate 109a bolt hole 110 RHS member 111 fastening work space

Claims (6)

A square steel pipe,
Weld joint profile angle shape provided on one axial end side of the cylindrical joint body, provided at both ends butted with welded steel hollow join preparative said square tube,
The steel hollow joint, the provided on the other axial end side of the joint body, which has a plate joint bolt hole plurality formed end plate is welded to the end of the other end face, made the steel hollow joints, has from the weld joint in axial direction of the straight pipe region R1 is a square tube and substantially the same vertical cross-section in the axial direction, axial direction than the weld joint adjacent to the region R1 A straight tube region R3 having a region R2 formed with a continuously narrowing vertical cross-sectional area and having substantially the same vertical cross section adjacent to the region R2 up to the plate joint portion in the axial direction. A square steel pipe member characterized by having a direction . The square steel pipe member according to claim 1, wherein the joint body of the steel hollow joint is integrally formed. The square and the steel pipe and the weld joint of the steel hollow joint, RHS member according to claim 1 or 2, characterized in that it is welded to the plate interposed therebetween. Plate Joints of the steel hollow joint, at the site corresponding to the four corners of the rectangular cross section in which the weld joint is formed, characterized in that it is formed narrower on the inside than the welded joint The square steel pipe member according to any one of claims 1 to 3. The steel hollow joint, at one end of the joint body, the formed narrows in inside the weld joint, the insertion portion to be fitted is inserted into the square tube as the backing, the square The square steel pipe member according to claim 1, 2 or 4, which is welded to the steel pipe. The square steel pipe member according to any one of claims 1 to 5, wherein the square steel pipe is used as a beam or a diagonal member.

Images