JP5298761B2 - Round steel pipe member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a circular steel pipe member capable of reducing the influence of stress concentration while ensuring a space for work for tightening a bolt and a nut, facilitating assembly work by welding, and suppressing required machinability to low degree. <P>SOLUTION: This circular steel pipe member includes a circular steel pipe 5, and a steel hollow joint 4 constituted by butting and welding a welded joint part 11 provided on one end side in the axial direction of a cylindrical joint body and having circular cross section, against/with both ends of the circular steel pipe 5. The steel hollow joint 4 has a plate joined part 13 which is provided on the other end side in the axial direction of the joint body 10 and with which an end plate 31 forming a plurality of bolt holes 33 on an end face on the other end side is welded. The plate joined part 13 is formed by being caught on an inner side more than the welded joint part 11 at least in sections corresponding to the positions of bolt holes 33. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a circular steel pipe member used as a structural member such as a column, a beam, a diagonal member or the like in a building structure.

  2. Description of the Related Art Conventionally, steel structures such as square steel pipes and round steel pipes are widely used as structural members constituting steel structures made of columns, beams, diagonal members and other structural members. And conventionally, by attaching other members to the end of the steel pipe such as this square steel pipe, or by performing various processing, the end of the steel pipe can be joined to other structural members. Steel pipe members have been proposed.

  FIG. 20A is a perspective view showing a configuration of a joint structure 100 in which a conventionally proposed steel pipe member 110 is joined to a beam member 103, and FIG. 20B is an exploded perspective view thereof. 20 (c) is a plan sectional view thereof. This steel pipe member 110 has a square joining plate 105 having a shape corresponding to the cross-sectional shape of the square steel pipe 101, and a pair of L-shaped angle members 107 with respect to the end portions 101a on both sides of the square steel pipe 101. An end plate 109 having a plurality of bolt holes 109a is sequentially fixed by welding. The steel pipe member 110 is joined to the beam member 103 by bolting the end plate 109 to the beam 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 109 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 steel pipe member has been proposed in which a space for fastening work 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 A steel pipe member in which is formed has been proposed.

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

  However, since the steel pipe member 110 shown in FIG. 20 has a discontinuous cross section between the square steel pipe 101 and the pair of angle members 107, stress concentration occurs even though the steel plate member 110 is interposed through the joining plate 105. There is a problem that the starting point is easily broken, and the performance of the square steel pipe 101 cannot be sufficiently exhibited at both ends of the steel pipe member 110. 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. There is a problem that 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 steel pipe member, and a flat surface is provided to weld the end face to the end plate. In reality, it is necessary to finish the end face, and there is a problem that it takes time and effort.

  The above-mentioned problems are all explained by taking a steel pipe member constituted by attaching other members to a square steel pipe as an example, but the same applies when a round steel pipe is used instead of a square steel pipe. I can say that. That is, conventionally, there has been proposed a circular steel pipe member made of a circular steel pipe having a low workability, which can relax the influence of stress concentration while ensuring a space for fastening work of bolts and nuts, facilitates assembly work by welding. There wasn't.

  Therefore, the present invention has been devised in view of the above-described problems, and the object of the present invention is a circular steel pipe member joined to a column, a beam, a diagonal member or other structural member. An object of the present invention is to provide a circular steel pipe member that can alleviate the influence of stress concentration while ensuring a space for fastening work of bolts and nuts, can be easily assembled 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.

A circular steel pipe member according to claim 1 is a steel in which a circular steel pipe and a weld joint having a circular cross section provided on one end side in the axial direction of a cylindrical joint body are butted against both ends of the circular steel pipe. The steel hollow joint is provided on the other end side in the axial direction of the joint body, and an end formed by arranging and forming four bolt holes in a substantially square shape with respect to the other end side end face. The plate joint has a welded plate, the plate joint has a substantially square cross section, each side of the substantially square cross section faces the bolt hole side, and the substantially square shape. The diagonal length connecting the outer edges of the apexes of the cross section is between the inner circumference circle diameter and the outer circumference circle diameter of the vertical section of the circular steel pipe .

  According to a second aspect of the present invention, the circular steel pipe member according to the first aspect of the invention is characterized in that the joint body of the steel hollow joint is integrally formed.

  The circular steel pipe member according to claim 3 is the invention according to claim 1 or 2, wherein the circular steel pipe and the welded joint of the steel hollow joint are welded to a plate interposed therebetween. And

  According to a fourth aspect of the present invention, in the invention according to the first and second aspects, the steel hollow joint is formed such that the one end of the joint body is narrower on the inner side than the weld joint, It is characterized by being welded to the circular steel pipe with the insertion portion inserted into and fitted into the circular steel pipe as a backing.

A circular steel pipe member according to a fifth aspect is the invention according to any one of the first to fourth aspects, wherein the circular steel pipe is used as a column, a beam, or a diagonal member.

  According to the circular steel pipe member concerning Claim 1, it is set as the shape which can ensure a cross section widely on the outer side of a shaft center, obtaining the space for fastening work of a bolt nut. Further, since the circular steel pipe and the steel hollow joint have the same hollow circular cross section, it is possible to suppress the influence of an increase in weld line and stress concentration. In addition, since the steel hollow joint, which is a separate member, is attached to the end of the circular steel pipe, only the steel hollow joint can be thinned with high strength. However, the whole circular steel pipe member can be reduced in weight. Moreover, since the circular 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.

  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 excellent from the viewpoint of.

  According to the invention which concerns on Claim 3, since the plate is interposed between the steel hollow joint and the square steel pipe, each dimensional accuracy of a circular steel pipe and a steel hollow joint can be eased.

  According to the invention which concerns on Claim 4, the insertion part serves as the positioning means and the backing, and has excellent workability.

  Hereinafter, as the best mode for carrying out the present invention, a circular steel pipe member used as a structural member such as a column, a beam, a diagonal member or the like in a building structure will be described in detail with reference to the drawings.

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

  FIG. 1 is a perspective view showing a joint structure 2 in which an end 1a of a circular steel pipe member 1 to which the present invention is applied is joined to a beam member 3 made of H-shaped steel. In the present embodiment, the beam members 3 extending in the horizontal direction are provided at intervals in the vertical direction, and the ends 1a on both sides of the circular steel pipe member 1 extending in the vertical direction are joined to these members. This will be described as an example.

  The joining structure 2 using the circular steel pipe member 1 in the present invention is a structural member that is extended in two different directions, and is an intersection where the end 1a of the circular steel pipe member 1 as a column and the beam member 3 intersect. 9 is used.

  The beam member 3 should just be comprised from what can contact | abut the end plate 31 provided in the edge part 1a of the circular steel pipe member 1, and can bolt these. Examples of the beam member 3 include shape steel members having various cross-sectional shapes such as H-shaped steel, L-shaped steel, C-shaped steel, and box-shaped steel, and plate-shaped members such as steel plates.

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

  The circular steel pipe member 1 includes a round steel pipe 5 used as a column and a steel hollow joint 4 welded to both ends 5a of the circular steel pipe 5. The circular steel pipe 5 is formed in a circular cross section, but in the present invention, it also includes an elliptical cross section.

  FIG. 5 shows a configuration of a steel hollow joint 4 constituting a part of the circular steel pipe member 1, (a) is a perspective view thereof, (b) is a plan view thereof, and (c) is a plan view thereof. It is AA sectional view taken on the line of (a). FIG. 6 is a plan view of 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, in the region of the range R2, the inclined surface 16 extends from the circular cross section of the range R1 located below the side surface portion 14b of the rectangular cross section of the range R3 to the side surface portion 14b of the square cross section of the range R3. Further, the corner portion 14a of the rectangular cross section in the range R3 and the circular cross section of the range R1 located below the corner portion 14a are formed 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 face 5 b at one end of the circular steel pipe 5 abutted against the end face 11 a located on the 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 circular steel pipe 5 are fixed, the weld joint 11 and the end 5 a of the round steel pipe 5 are fixed. A weld bead 35 is formed between them.

  As shown in FIGS. 3 and 4, the weld joint 11 has a shape corresponding to the shape of the circular steel pipe 5. Specifically, the welded joint portion 11 is formed in a circular cross section so as to form an outer shape substantially the same as the outer shape of the circular steel pipe 5 after being fixed to the circular steel pipe 5. Thereby, the circular steel pipe member 1 can suppress the part which protrudes outside rather than the outer periphery of the circular steel pipe 5 from the intermediate part 5c of the circular 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 the finishing material or the like to the circular steel pipe member 1 or its surroundings, and the degree of freedom in design is improved. In addition, after the welded joint 11 is fixed to the circular steel pipe 5, a portion having a sudden change in cross-sectional shape is not formed between the steel hollow joint 4 and the circular steel pipe 5, and stress concentration occurs. It is possible to suppress.

  Further, the circular steel pipe member 1 is configured such that the weld joint 11 is directly fixed to the end 5a of the circular steel pipe 5 by welding without sandwiching the member between the weld joint 11 and the end 5a of the round 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 FIG. 5B and FIG. 5C, the plate joint portion 13 is formed in a square cross section, that is, a square cross section.

  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. 6, the narrowed portion of the plate joint 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 6, between the end plate 31 and the inclined surface 16 of the reduced diameter portion 17, the bolt inserted into the bolt hole 33 of the end plate 31, or screwed to this. A fastening work space 18 that facilitates the fastening work of the nut 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 circular steel pipe member 1 having such a configuration to the beam member 3 will be described.

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

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

  In the steel hollow joint 4 constituting a part of the circular 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 circular 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 the bolt / nut fastening space 18.

  Further, the circular steel pipe member 1 according to the present invention has a hollow circular cross section in which the welded joint portion 11 of the steel hollow joint 4 and the circular steel pipe 5 to which the steel steel hollow joint 4 is welded have substantially the same hollow circular cross section. It becomes possible to suppress the influence.

  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 circular steel pipe 5, only the steel hollow joint 4 can be made thin with high intensity | strength. For this reason, according to the circular steel pipe member 1 in this invention, it is set as the structure which can be reduced in weight as the circular steel pipe member 1 whole, obtaining the space 18 for bolt nut fastening operation | work.

  Further, the circular steel pipe member 1 in the present invention has a smaller number of members than the steel pipe member 110 shown in FIG. 20, and the assembly work is completed with a small number of weldings, so that it is not necessary to weld to the complicated part. It is excellent in terms of time and cost.

  Next, 2nd Embodiment of the circular 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 the configuration of the circular steel pipe member 1A of the second embodiment, FIG. 8 is an enlarged perspective view of the end 1a of the circular steel pipe member 1A of FIG. 7, and FIG. It is a perspective view.

  Compared with the circular steel pipe member 1 shown in FIG. 2, the circular steel pipe member 1 </ b> A is provided between the end 5 a of the circular steel pipe 5 and the welded 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 and welded to the end face 11 a of the weld joint 11 of the steel hollow joint 4, and the other side 37 b is a circular steel pipe 5. The end face 5b is butted and welded.

  The joining plate 37 has a shape corresponding to the shape of the end 5a of the circular steel pipe 5 and the welded joint 11 of the steel hollow joint 4, and the outer shape thereof is formed in a circular cross section substantially similar to these. Yes. In the examples shown in FIGS. 7 to 9, the relative dimensions of the circular steel pipe 5, the steel hollow joint 4, and the joining plate 37 are larger than the diameter of the weld joint 11 of the steel hollow joint 4. The diameter of the joining plate 37 is slightly larger than the diameter of the circular steel pipe 5. The relative dimensions of the joining plate 37 with respect to the circular steel pipe 5 and the steel hollow joint 4 are such that the diameter of the welded joint 11 of the circular steel pipe 5 and the steel hollow joint 4 is substantially the same as the diameter of the joining plate 37. May be.

  Thus, when it is set as the structure welded to the joining plate 37 interposed between the steel hollow joint 4 and the circular steel pipe 5, relative dimension control in the end surface of the circular 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 cross-sectional shape for each manufacturing time and manufacturer can be mitigated, and there is an advantage that material procurement can be stabilized.

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

  FIG. 10 shows a perspective view of the circular steel pipe member 1B of the third embodiment. This circular steel pipe member 1B is different from the circular 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 the circular 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 diameter of the circle formed by the circular cross section of the plate joint 13 in the steel hollow joint 4 </ b> A according to the present embodiment is shorter than the diameter of the circle formed by the circular cross section of the weld joint 11. Has been.

  FIG. 12 shows a steel hollow joint 4B according to the present invention as another embodiment, FIG. 12 (a) is a perspective view thereof, FIG. 12 (b) is a plan view thereof, and FIG. HH line sectional drawing is shown.

  The steel hollow joint 4B is different from the steel hollow joint 4A shown in FIG. 11 in the cross-sectional shapes of the weld joint 11 and the plate joint 13. Specifically, the cross-sectional shape of the weld joint 11 of the steel hollow joint 4C is formed in a substantially elliptical shape, and the cross-sectional shape of the plate joint 13 is formed in a substantially rhombus shape.

  Thus, in the steel hollow joints 4 and 4A according to the present invention, the shape of the plate joint portion 13 is narrower on the inner side than the weld joint portion 11 at a portion corresponding to the position of the bolt hole 33 of the end plate 31. It may be formed in such a way that it may be formed narrower on the inner side than the weld joint 11 even in a portion not corresponding to the bolt hole 33. 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.

  Moreover, as shown in FIG. 6, the steel hollow joints 4, 4A, 4B used in the present invention have portions where the plate joints 13 correspond to the corners 31a at the four corners of the end plate 31 configured in a rectangular shape. In this case, it is preferably formed narrower on the inner side than the weld joint 11. 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.

  In addition, if the example of the dimension of the circular steel pipe member 1 grade | etc., Which concerns on this invention is demonstrated, the height of the circular steel pipe member 1 shown by FIG. 2 shall be 2600 mm. The circular steel pipe 5 has a substantially circular cross section with a diameter of 60 mm on the outer periphery, and its plate thickness is 3.2 mm. Further, the steel hollow joint 4 shown in FIG. 5 has a welded joint portion 11 having a substantially circular cross section with a diameter of 60 mm on the outer periphery, and a plate joint portion 13 having a substantially square cross section with a side of 45 mm. The height of 10 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 beam member 3 made of H-shaped steel shown in FIG. 1, the flange 3a has a width of 100 mm and the web 3b has a height of 200 mm. Moreover, the joining plate 37 shown in FIG. 7 has a substantially circular shape with a diameter of 63 mm on the outer periphery, and its plate thickness is 9 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 portion 13 has a substantially circular shape with a diameter of 45 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 joint 4 used for the above-mentioned circular steel pipe member 1 is demonstrated.

  The steel hollow joint 4 according to the present invention is manufactured by, for example, hydroform molding, press molding or the like, but is preferably manufactured by integral molding such as hydroform molding. Below, an example of the method of manufacturing the steel hollow joint 4 shown by FIG. 5 by hydroforming is demonstrated.

  FIG. 13A is a side cross-sectional view schematically showing a configuration of a hydroform molding apparatus 50 that can realize the method for manufacturing the steel hollow joint 4 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 4 shown in FIG. 5 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 rectangular recess 53a provided at a position corresponding to both ends of the material tube 57, a semicircular recess 53b provided at a position corresponding to the center of the material tube 57, a square recess 53a, and a semicircular recess 53b. And an expanding recess 53c that is smoothly expanded so as to approach the semicircular shape from the square as it goes from the rectangular recess 53a to the semicircular recess 53b.

  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 D-D of FIG. 13B. ing. As shown in this figure, by hydroforming, both end sides of the material pipe 57 are formed into a square cross section by a rectangular recess 53a of the cavity 53 of the upper mold 51 and the lower mold 52, and the central portion of the material pipe 57 is formed. Are formed in a circular cross section by the semicircular 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 4 are obtained.

  As described above, when the steel hollow joint 4 according to the present invention is manufactured by hydroforming, the shape of the steel hollow joint 4 according to the present invention is more complicated than when manufactured by other forming methods. Even if it is a thing, it can manufacture easily. Further, the steel hollow joint 4 according to the present invention manufactured by integral molding such as hydroform molding is obtained by integral molding without using welding, so there is no adverse effect on strength due to welding distortion, It is also excellent from the viewpoint of design because there is no cutting line in the appearance. Further, by hydroforming the steel hollow joint 4 according to the present invention, it is not necessary to finish the flat surface on the end surface 13a of the plate joint 13, reducing the number of manufacturing steps of the steel hollow joint 4, and the manufacturing cost. Can be reduced.

  In addition, when two hydro hollow joints 4 are obtained by cutting a hydroform molded product 61 having a shape symmetrical on both sides of the axial center so as to be divided into two at the axial center. Two steel hollow joints 4 having the same shape can be obtained from the cavities 53 of the upper mold 51 and the lower mold 52, and the mass productivity is excellent. 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.

  In addition, the above-mentioned hydroform shaping | molding apparatus 50 and a hydrofoam shaping | molding process were demonstrated as an example of the method of manufacturing the steel hollow joint 4, and are not limited to the above-mentioned structure and process order. For this reason, for example, only one steel hollow joint 4 may be formed by a pair of upper mold 51 and lower mold 52, or three or more may be formed. As shown in FIGS. 13 and 14, when two steel hollow joints 4 are obtained from the hydroform molded product 61 having a shape that is symmetrical on both sides of the center in the axial direction, There is an advantage that the compressive load of the shaft pressing by the shaft 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 the hollow steel joints 4 shown in FIG. 5 are formed as an example, the cavity 53 has a rectangular recess 53a, an expanded recess 53c, a semicircular recess 53b, and an expanded recess 53c as one 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 joint 4 based on this invention at the time of using press molding is demonstrated. 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 circular steel pipe 5 is welded to the weld joint 11 of the steel hollow joint 4 as in the circular 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 circular 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 obtained groove 23.

  Further, as shown in FIG. 16 (b), the one end side 10 a of the steel hollow joint 4 is narrower on the inner side than the weld joint 11 of the joint body 10, and is fitted in the circular 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 circular 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 circular steel pipe 5. The step 22 is stopped at a position away from the upper end surface 5b of the circular steel pipe 5 after being inserted, and the end portion 5b of the circular steel pipe 5 and the step 22 are backed by using the insertion portion 20 as a backing. 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.

  Incidentally, as shown in FIG. 16 (b), the steel hollow joint 4 is made stronger than the circular steel pipe 5 as necessary, thereby ensuring the strength at the end of the circular steel pipe member 1 and making the steel hollow It is possible to make the joint 4 thinner than the circular steel pipe 5.

  Moreover, the circular steel pipe member 1 which concerns on this invention may be used as a beam and a diagonal material in a building structure as follows.

  FIG. 17 is a perspective view showing a state in which the circular steel pipe member 1 according to the present invention is used as a beam.

  In this case, the column member 3 </ b> A as the other structural member to be joined to the circular steel pipe 5 is extended in the vertical direction and arranged at intervals in the horizontal direction. The circular steel pipe member 1 is attached perpendicularly to the column member 3A as a beam by bringing the end plates 31 at both ends into contact with these column members 3A and bolting them.

  FIG. 18 shows a steel hollow joint 4B in which the cross-sectional shape of the weld joint 11 is substantially elliptical, instead of the circular steel pipe member 1 comprising the steel hollow joint 4 shown in FIG. 17 and the circular steel pipe 5 having a circular cross section. 2 is a perspective view showing a state in which a circular steel pipe member 1 composed of a circular steel pipe 5 having an elliptical cross section is used as a beam.

  FIG. 19 is a perspective view showing a state in which the circular steel pipe member 1 according to the present invention is used as an oblique material.

  In this case, in the vicinity of the corner 41 where the beam member 3 and the column member 3A intersect, one end side is fixed to the beam member 3 by welding or the like, and the other end side is made of a steel plate or the like fixed to the column member 3A by welding or the like. By providing the inclined plate 3B, the end plates 31 at both ends of the circular steel pipe member 1 are brought into contact with the inclined plate 3B, and these are bolted together, whereby the circular steel pipe member 7 is attached as an oblique material. In this case, the inclined plate 3B corresponds to the above-described circular steel pipe 5 and the other structural member to be joined.

  Incidentally, as shown in FIG. 18, a reinforcing rib 43 made of a substantially triangular steel plate or the like is provided at a portion surrounded by the inclined plate 3B, the column member 3A, and the beam member 3 with respect to the inclined plate 3B and the like. It is fixed by welding.

  The circular steel pipe member to which the present invention is applied is not limited to the above-described embodiment, and may be appropriately changed in design and the like without departing from the gist of the present invention.

It is a perspective view which shows the joining structure which joined the edge part of the circular steel pipe member with respect to the beam member. It is a perspective view which shows the structure of a circular steel pipe member. It is an expansion perspective view of the edge part of the circular steel pipe member shown by FIG. It is a disassembled perspective view of the circular steel pipe member shown by FIG. The structure of the steel hollow joint which comprises a part of circular 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. It is a top view in FIG. It is a perspective view which shows the structure of the circular steel pipe member by which the joining plate was interposed between the steel hollow joint and the circular steel pipe. It is an expansion perspective view of the edge part of the circular steel pipe member shown by FIG. It is a disassembled perspective view of the circular steel pipe member shown by FIG. It is a perspective view of the circular 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 circular 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. The structure of the steel hollow joint of other embodiment is shown, (a) is the perspective view, (b) is the top view, (c) is the HH sectional view taken on the line of (a). It is. (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 circular steel pipe which provided the groove | channel, (b) fixed the steel hollow joint which provided the insertion part to a circular steel pipe It is side surface sectional drawing which shows the made structure. It is a perspective view which shows the state which used the circular steel pipe member as a beam. It is a perspective view which shows the state which used the circular steel pipe member which consists of a steel hollow joint whose cross-sectional shape of a welding junction part is substantially elliptical, and a circular steel pipe with a cross-sectional elliptical shape as a beam. It is a perspective view which shows the state which used the circular steel pipe member as an oblique material. It is a figure for demonstrating a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 1A, 1B Circular steel pipe member 1a End part 2 Joining structure 3 Beam member 3A Column member 3B Inclined plate 3a Flange 3b Web 4, 4A, 4B Steel hollow joint 5 Circular steel pipe 5a End part 5b End surface 5c Middle part 9 Intersection part DESCRIPTION OF SYMBOLS 10 Joint main body 10a One end side 10b The other end side 11 Weld joint part 11a End surface 13 Plate joint part 13a End surface 18 Space 20 for fastening work Insertion part 22 Step 23 Groove 31 End plate 33 Bolt hole 35 Weld bead 37 Join plate 50 Hydroform Molding device 51 Upper mold (split mold)
52 Lower mold (split mold)
53 Cavity 53a Square recess 53b Semi-circular recess 53c Expanding recess 55 Axial press punch 57 Material pipe 59 Pressure medium 61 Hydroform molded product 63 Press molded product 63a Side end surface 100 Joint structure 101 Square steel pipe 103 Beam member 105 Joint plate 107 Angle member 109 End plate 109a Bolt hole 110 Steel pipe member 111 Fastening space

Claims (5)

A round steel pipe,
A welded joint having a circular cross section provided on one end side in the axial direction of the cylindrical joint body includes a steel hollow joint that is abutted and welded to both ends of the circular steel pipe,
The steel hollow joint is provided on the other end side in the axial direction of the joint body, and has four bolt holes arranged in a substantially square shape with respect to the other end side end surface. The plate joint has a substantially square cross section, each side of the substantially square cross section faces the bolt hole side, and the outer edges of the apexes of the substantially square cross section. A circular steel pipe member characterized in that a diagonal length connecting the two is between an inner circumferential circle diameter and an outer circumferential circle diameter of a vertical section of the circular steel pipe. The circular steel pipe member according to claim 1, wherein the joint body of the steel hollow joint is integrally formed. The circular steel pipe member according to claim 1 or 2, wherein the circular steel pipe and the welded joint portion of the steel hollow joint are welded to a plate interposed therebetween. The steel hollow joint is formed at the end of one end side of the joint body so as to be narrower on the inner side than the welded joint, and is inserted into the circular steel pipe and fitted into the circular steel pipe. The circular steel pipe member according to claim 1 or 2, wherein the round steel pipe member is welded to the steel pipe. The circular steel pipe member according to any one of claims 1 to 4 , wherein the circular steel pipe is used as a column, a beam, or a diagonal member.

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