JP2012077436A - Connection method for closed section members - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connection method for closed section members providing a stable quality by mechanical connection, making the work on the site easier than when welding is used, enabling the work even at a place where the use of fire is restricted, and achieving a beautiful finish because there is no projection such as bolt heads at a junction.SOLUTION: A connection method for closed section members comprises a step of forming a joint member 3 in which a plurality of pin holes A are bored in the material axis direction at an interval in two directions perpendicular to each other, a step of inserting the joint member 3 into the ends of closed section members 1 in which pin holes B are formed in advance at positions corresponding to the pin holes A of the joint member 3, and a step of driving pins 5 through the pin holes B of the closed section members 1 and the pin holes A of the joint member 3 from two directions perpendicular to each other.

Description

  The present invention relates to a method for joining closed cross-section members such as round pipes and square pipes.

  For example, when a back mullion (orientation) of a glass curtain wall is constructed with a closed cross-section member such as a round pipe or a square pipe, welding or bolt connection is often employed as a method for joining the closed cross-section members.

  In the case of welding, since a protruding portion such as a bolt head does not occur at the joint portion, the finish is beautiful and the design of the back mullion (orientation) can be improved. On the other hand, however, there is a problem that it is difficult to prove the quality because it is difficult to apply ultrasonic flaw detection to the welding of thin steel pipes. In addition, the work at the site is more troublesome than the bolt tightening, and there is a problem that the work cannot be performed in a place where the fire cannot be used.

  In this respect, the bolt connection can be performed even in a place where the fire cannot be used, but the bolt head protrudes from the joint portion, which may not be preferred in design. In addition, even if it employ | adopts the technique which pin-connects closed cross-section members which are seen by patent document 1, a pin front-end | tip and a pin head will protrude in a joining part, and it is a large and small difference with the case by a bolt connection. In addition, in the case of connection with a pin, rattling due to a dimensional error between the pin and the pin hole is likely to occur, and in order to prevent unintentional dropout of the pin, a special taper pin is used, or as seen in Patent Document 1, It is necessary to provide some kind of retaining tool at one end of the pin.

Japanese Patent Laid-Open No. 9-195393

  The present invention was made in view of the above-mentioned problems, and the purpose of the present invention is not only to obtain stable quality by making mechanical joining unnecessary welding work, Compared to welding, it is easier to work on-site and can work in places where fire cannot be used, yet there is no backlash due to dimensional errors between pins and pin holes, and as with welding, Since there is no protrusion such as a bolt head, it is an object to provide a method for joining closed cross-section members that has a beautiful finish and can improve the design.

  In order to achieve the above object, technical measures taken by the present invention are as follows. In other words, the closed cross-section member joining method according to the first aspect of the present invention includes a step of forming a joining member in which a plurality of pin holes are drilled in the material axis direction at intervals in two directions perpendicular to each other. A step of inserting the joining member into an end portion of the closed cross-sectional member in which a pin hole is previously formed at a position corresponding to the pin hole of the joining member, and the pin hole of the closed cross-sectional member and the pin hole of the joining member It is characterized by having a step of driving the pins from two directions perpendicular to each other.

The invention according to claim 2 is the method for joining the closed cross-section members according to claim 1, wherein the joining member is formed with a slit for assembly at the center in the width direction, and half on both side edges of the slit. A plurality of circular pin hole forming recesses are formed at intervals in the slit longitudinal direction, and two joining plate members each having a plurality of pin hole forming long holes formed on the slit extension line are formed as the slits. The cross-sectional shape becomes a cruciform shape by fitting each other, and a circular pin hole that obliquely crosses the cruciform intersection is formed by the semicircular pin hole forming recess and the pin hole forming long hole. It is characterized by being formed by a combined cross-shaped joining member.

  The invention according to claim 3 is the method for joining the closed section member according to claim 1, wherein the joining member has an outer dimension inscribed inside the closed section member according to claim 1, It is characterized in that it is formed by a closed cross-section type joining member formed by drilling a plurality of pin holes in the material axis direction at intervals in two directions perpendicular to each other.

  Invention of Claim 4 is a joining method of the closed cross-section member in any one of Claims 1-3, Comprising: On the opposing end surface of the two closed cross-section members joined linearly, the said A positioning notch for fitting with a positioning pin driven in a central pin hole in the joining member is formed.

  The invention according to claim 5 is the method for joining the closed cross-section members according to any one of claims 1 to 3, wherein the closed end faces of the two closed cross-section members joined in a straight line are connected to each other. A notch for positioning is formed to be fitted to the end of the joining member in the direction orthogonal to the closed cross-section member, and the two end faces of the closed cross-section member joined in the direction orthogonal to the joining member have the two A notch for positioning that fits with the outer peripheral surface of the closed cross-section member is formed.

  The invention according to claim 6 is the method for joining the closed cross-section members according to any one of claims 1 to 3, wherein the end faces of the two closed cross-section members joined in a state intersecting at an acute angle are mutually connected. It is characterized in that a positioning notch for positioning by contact is formed.

  According to the first aspect of the present invention, a joining member in which a plurality of pin holes are drilled in the material axis direction is inserted into the end portion of the closed cross-sectional member at intervals in two directions perpendicular to each other. The closed cross-section member is joined by an operation procedure of driving a pin over the pin hole of the closed cross-section member and the pin hole of the joining member. In particular, in the present invention, since the pins are driven from two directions perpendicular to each other, the dimensional error can be dispersed and the play can be eliminated.

  In this way, stable mechanical quality can be obtained by using mechanical joining that eliminates the need for welding work, and on-site work is easier than welding, and work can also be performed in places where fire cannot be used. It is. Nevertheless, there is no backlash due to the dimensional error between the pin and the pin hole, and, as with welding, there is no protruding part such as a bolt head at the joint part, so the finish is beautiful and the design can be improved. .

  As a joining member in the invention according to claim 1, as described in claim 2, the joining member is formed with a slit for assembly at the center in the width direction, and is semicircular on both side edges of the slit. A plurality of pin hole forming recesses are formed at intervals in the slit longitudinal direction, and the slits are fitted into two joining plate materials each having a plurality of pin hole forming long holes formed on the slit extension line. As a result, the cross-sectional shape becomes a cross shape, and a semi-circular pin hole forming recess and a pin hole forming long hole are combined so that a circular pin hole obliquely crossing the cross intersection is formed. It may be formed by a cross-shaped joining member, and, as described in claim 3, has an outer dimension inscribed inside the closed cross-section member, and is spaced apart in two directions perpendicular to each other, and a plurality of members are arranged in the material axis direction. Pin holes are drilled It may be formed by that closed section-type joint member.

  If it is a cross-shaped joining member as described in claim 2, it can be easily manufactured by laser processing of a flat bar, and if it is a closed cross-section joining member as described in claim 3, a ready-made round pipe or corner can be used. There exists an advantage which can be manufactured easily using a pipe.

  According to the invention described in claim 4, the notch for positioning formed on the end surface of the closed cross-section member is fitted with the positioning pin driven into the pin hole at the center of the joining member. Thus, the pin hole of the closed cross-section member and the pin hole of the joining member can be matched, so that the pin can be driven easily.

  According to the invention described in claim 5, when the three closed cross-section members are joined in a T shape, that is, two are joined in a straight line, and the remaining one is joined in a direction perpendicular to them. A positioning notch portion formed on opposite end faces of two closed cross-section members is used as a joining member in an orthogonal direction (a cross-shaped joining member or a closed cross-section joining member for joining the remaining one). ), The pin holes of the two closed cross-section members can be matched with the pin holes of the joint member for joining the two closed cross-section members linearly, Closed cross-section member joined in the orthogonal direction by fitting a notch for positioning formed on the end face of the closed cross-section member joined in the orthogonal direction to the outer peripheral surface of the two closed cross-section members Match the pin hole of the pin with the pin hole of the joining member that joins it. Since bets can, it is possible to perform the driving of the pin easily.

  According to the sixth aspect of the present invention, when joining a plurality of closed cross-section members in a direction crossing each other at an acute angle, the positioning notches formed on the end surfaces of the closed cross-section members are abutted against each other. By making contact, the pin hole of the closed cross-section member and the pin hole of the joining member (cross-shaped joining member or closed cross-section joining member) can be matched, and the pin can be driven easily.

It is a perspective view of the back mullion of the glass curtain wall by which the joining method of the closed section member by the present invention was adopted. It is a perspective view of the principal part of the back mullion which shows the state just before joining. It is explanatory drawing of the joining method of the closed cross-section member by this invention. It is explanatory drawing following FIG. It is explanatory drawing following FIG. It is explanatory drawing following FIG. It is explanatory drawing following FIG. It is sectional drawing of the joined closed cross-section member. It is explanatory drawing of a cross-shaped joining member. It is explanatory drawing of the cross-shaped joining member which shows other embodiment of this invention. It is a perspective view of the principal part of the cross-shaped joining member which shows other embodiment of this invention. It is explanatory drawing of the joining method of the closed cross-section member which shows other embodiment of this invention. It is explanatory drawing following FIG. It is explanatory drawing following FIG. It is explanatory drawing of the joining method of the closed cross-section member which shows other embodiment of this invention. It is explanatory drawing following FIG. It is explanatory drawing following FIG. It is explanatory drawing following FIG. It is explanatory drawing of the joining method of the closed cross-section member which shows other embodiment of this invention. It is explanatory drawing following FIG. It is explanatory drawing following FIG. It is explanatory drawing of the joining method of the closed cross-section member which shows other embodiment of this invention. It is sectional drawing of the joined closed cross-section member which shows other embodiment of this invention. It is sectional drawing of the joined closed cross-section member which shows other embodiment of this invention. It is explanatory drawing of the joining method shown in FIG. It is explanatory drawing following FIG. It is explanatory drawing following FIG. It is explanatory drawing of the joining method of the closed cross-section member which shows other embodiment of this invention. It is sectional drawing of the joined closed cross-section member which shows other embodiment of this invention.

1 and 2 show a back mullion of a glass curtain wall constructed by a closed cross-section member (round pipe in the illustrated example) 1. P in FIG. ₁ shows a joint portion of the closed-section member 1 for provided in a vertical posture main material, P ₂ is closed-section member 1 for diagonal member provided in non-parallel inclined attitude to each other The joint part is shown. 3A in the figure indicates a cross-shaped joining member which is an example of the joining member 3 for the closed cross-section member.

  Next, a method for joining closed cross-section members according to the present invention will be described. First, as shown in FIG. 3, an assembly slit S is formed at the center in the width direction, and a plurality of semicircular pin hole forming recesses a are formed on both side edges of the slit S at intervals in the slit longitudinal direction. The two plate members for bonding 2 formed individually and having a plurality of pin hole forming long holes b formed on the extension lines of the slits S are produced by laser processing of a flat bar. The inner surface of the slit S, the inner surface of the pin hole forming recess a, and the inner surface of the pin hole forming long hole b are all the plate surfaces of the bonding plate 2 as shown in FIGS. And a right angle (parallel to the thickness direction).

  Then, as shown in FIG. 4, the above-described two plate members for bonding 2 have a cross-shaped cross section when the slits are fitted to each other, and a semicircular pin hole forming recess a and a pin hole. The cross-shaped joining member 3A is formed by combining the long holes for forming b so as to form a circular pin hole A that obliquely crosses the cross intersection. As shown in FIG. 9B, the circular pin hole A that obliquely crosses the cross intersection portion opens in two directions (X direction and Y direction) perpendicular to each other. Pins can also be driven from the direction. In this state, as shown in FIGS. 4 and 5, the positioning pin 4 is driven into the center pin hole A of the cross-shaped joining member 3A with a hammer.

  Thereafter, as shown in FIGS. 5 and 6, the cross-shaped joining member 3 is formed at the end of the closed cross-section member 1 in which the pin hole B is previously formed at a position corresponding to the pin hole A of the cross-shaped joining member 3 </ b> A. Insert. Positioning notches C for fitting with the positioning pins 4 are formed on opposite end surfaces of the two closed cross-section members 1 joined in a straight line. By being fitted to the positioning pins 4, the pin hole B of the closed cross-section member 1 and the pin hole A of the cross-shaped joining member 3 </ b> A are configured to match.

  Then, as shown in FIGS. 6 to 8, the connecting pin 5 extends in two directions (X direction and Y direction) perpendicular to each other across the pin hole B of the closed cross-section member 1 and the pin hole A of the cross-shaped joining member 3A. The two closed cross-section members 1 are joined in a straight line by driving them with a hammer.

  In addition, the clearance between the members is not taken, it is processed so that only the laser cutting width (about 0.2 mm) can be accommodated, and it is configured so that the play is almost eliminated by driving all the pins. Yes. In addition, since the pins 5 are driven alternately from two directions perpendicular to each other (X direction and Y direction), even if there is a slight dimensional error, the dimensional error is dispersed by driving the pins 5 alternately from two directions, The backlash can be eliminated.

In the above embodiment, the inner surface of the slit S, the inner surface of the pin hole forming recess a, and the inner surface of the pin hole forming long hole b are all perpendicular to the plate surface of the bonding plate 2 (parallel to the plate thickness direction). However, the inner surface of the pin hole forming recess a and the pin hole forming long hole b is inclined by 45 degrees with respect to the plate surface of the bonding plate 2 as shown in FIG. The inner surfaces of the pin hole forming recesses a and the pin hole forming long holes b adjacent to each other in the slit longitudinal direction can be alternately inclined by 45 degrees in the opposite direction. In this case, as a circular pin hole A that crosses the cross intersection diagonally, a pin hole A in which a pin can be driven from the X direction and a pin hole A in which a pin can be driven from the Y direction are provided in the material axis direction. It will be arranged alternately.

  According to said structure, the slit S for an assembly is formed in the center of the width direction, and the semicircular pin hole formation recessed part a is formed in both sides of the said slit S at intervals in the slit longitudinal direction. The cross-shaped joining member 3A is assembled by combining the two joining plate members 2 in which a plurality of pin hole forming long holes b are formed on the extension line of the slit S, and the cross-shaped joining member 3A is closed. The closed cross-section member is inserted into the end portion of the cross-section member 1 and the pin 5 is driven through the pin hole B of the closed cross-section member 1 and the pin hole A formed at the cross-intersection of the cross-shaped joining member 3A. 1 will be joined.

  In this way, stable mechanical quality can be obtained by using mechanical joining that eliminates the need for welding work, and on-site work is easier than welding, and work can also be performed in places where fire cannot be used. It is. Nevertheless, there is no backlash due to the dimensional error between the pin and the pin hole, and, as with welding, there is no protruding part such as a bolt head at the joint part, so the finish is beautiful and the design can be improved. .

  In addition, in the case of joining closed cross-section members 1 as a single material, or in the case of joining a plurality of unitized closed cross-section members 1 fixed in parallel to each other, FIG. As shown in FIG. 6, it is possible to perform the joining work by inserting half of the cross-shaped joining members 3A into the closed cross-section members 1 on both sides, but they are provided in a vertical posture as shown in FIG. When joining the unit in which the closed cross-section member 1 for the main material and the closed cross-section member 1 for the oblique material provided in the inclined postures that are not parallel to each other are joined, the main material and the diagonal material (the closed cross-sectional member in the vertical posture) 1 and a closed cross-section member 1 in an inclined posture, and a cross-shaped joining member 3A for two non-parallel closed cross-section members 1 such as diagonal members (closed cross-section members 1 in a non-parallel inclined posture). For the closed cross-section member 1 provided in a non-parallel inclined posture because it cannot be inserted at the same time, an example If, as follows, it will perform joint work.

  That is, as shown in FIG. 2, the entire cross-shaped joining member 3A is inserted in advance into the upper closed cross-section member 1 provided in the inclined posture, and the closed cross-section members 1 provided in the vertical posture are joined together. Thereafter, the cross-shaped joining member 3A is pulled out by half and inserted into the closed section member 1 on the lower side, and the closed section members 1 in the inclined posture are joined together.

  Specifically, as shown in FIG. 11, while a notch G for positioning is provided on the end surface on the inclined lower side of the cross-shaped joining member 3A, a closed cross section on the lower side is provided as shown in FIGS. Of the pin holes B formed in the member 1, the positioning pin 4 is inserted into the pin hole B at the lower end, and the cross-shaped joining member 3 A is slid downward and the half is closed on the lower side. When inserted into the cross-sectional member 1 and the end faces of the upper and lower closed cross-section members 1 are brought into contact with each other, the positioning pins 4 and the notches G are fitted to each other, and the pin holes B of the upper and lower closed cross-section members 1 are fitted. And the pin hole A of the cross-shaped joining member 3A are configured to match. In this state, as shown in FIG. 14, the connecting pins 5 are driven from two directions perpendicular to each other, and the closed cross-section members 1 in the inclined posture are joined to each other.

  Reference numeral 6 shown in FIGS. 12 and 13 denotes a temporary fixing pin that can be inserted into and removed from the pin hole B of the upper closed section member 1, and is a cross-shaped joining member 3 </ b> A inserted into the upper closed section member 1. The cross-shaped joining member 3A is temporarily fixed at a fixed position by fitting into the notch G.

15-18 show other embodiments of the present invention. In this embodiment, when the three closed cross-section members 1 are joined in a T shape, that is, two are joined in a straight line, and the remaining one is joined in a direction perpendicular to them, the joining of the present invention is performed. The cross-shaped joining member 3A is formed in a T-shape, and the opposite end surfaces of the two closed section members 1 joined in a straight line are orthogonal to the closed section member 1. Closed cross-section member 1 in which a positioning notch D is formed to be fitted to the side edge of the joining plate 2 in the cross-shaped joining member 3A in the direction to be joined, and is joined in the orthogonal direction by the cross-shaped joining member 3A. A characteristic feature is that a notch portion E for positioning that fits with the outer peripheral surfaces of the two closed cross-section members 1 is formed on the end face.

  According to the above configuration, when the three closed cross-section members are joined in a T shape, the positioning notches D formed on the opposing end surfaces of the two closed cross-section members 1 are orthogonal to each other. The pin holes B of the two closed cross-section members 1 are fitted to the side edges of the joining plate 2 in the cross-shaped joining member (cross-shaped joining member for joining the remaining one) 3A. The pin hole A of the cross-shaped joining member 3A for joining the two closed cross-section members 1 linearly can be matched, and further formed on the end face of the closed cross-section member 1 joined in the orthogonal direction. By fitting the positioning cutouts E to the outer peripheral surfaces of the two closed cross-section members 1, the pin holes B of the closed cross-section member 1 that are joined in the orthogonal direction and the cross shape that joins the pin holes B Since the pin hole A of the joining member 3A can be matched, the pin It is possible to implant easily. Other configurations and operations are the same as those in the embodiment of FIGS.

  19 to 21 show another embodiment of the present invention. In this embodiment, among the six closed cross-section members 1, three closed cross-section members 1 are joined in a T shape, and the remaining three closed cross-section members 1 are joined in a T shape. When joining in a direction that intersects an acute angle with respect to 1, the joining method of the present invention is applied, and the end surfaces of the two closed cross-section members 1 that are joined in a state intersecting with an acute angle are brought into contact with each other. This is characterized in that a notch F for positioning is formed.

  According to the above configuration, when joining a plurality of closed cross-section members 1 in a direction that intersects each other at an acute angle, the positioning notches F formed on the end faces of the closed cross-section members 1 are brought into contact with each other. By doing so, the pin hole B of the closed cross-section member 1 and the pin hole A of the cross-shaped joining member 3A can be matched, and the pin 5 can be driven easily. Other configurations and operations are the same as those in the embodiment of FIGS.

  FIG. 22 shows another embodiment of the present invention. In this embodiment, when three closed cross-section members are joined in a T-shape, two closed cross-section members 1 having the same diameter that are joined in a straight line are joined to each other at a right angle. It is characterized in that the diameter of the closed cross-section member 1 is made different (in the example shown, the diameter is reduced, but the diameter may be increased). Since other configurations and operations are the same as those of the embodiment of FIGS. 15 to 18, the same components are denoted by the same reference numerals, and description thereof is omitted.

  FIG. 23 shows another embodiment of the present invention. This embodiment is characterized in that the closed cross-section member 1 is a square pipe. Since other configurations and operations are the same as those in the embodiment of FIGS. 3 to 22, the same components are denoted by the same reference numerals, and description thereof is omitted.

  24 to 27 show another embodiment of the present invention. In this embodiment, a plurality of joining members 3 for closed cross-section members have an outer dimension inscribed inside the closed cross-section member (round pipe) 1 and are spaced apart in two directions perpendicular to each other in the material axis direction. Each pin hole A is formed by a round pipe-like closed cross-section type joining member 3B formed by drilling holes. Other configurations and operations are the same as those in the embodiment described with reference to FIGS. 6 to 8, and thus the same components are denoted by the same reference numerals and description thereof is omitted.

FIG. 28 shows another embodiment of the present invention. In this embodiment, a round pipe-shaped closed cross-section type joining member 3B as a joining member 3 for a closed cross-section member is formed in a T-shape, and the two closed cross-section members 1 joined in a straight line are relative to each other. A positioning notch H having a semicircular shape that fits the end of the closed cross-section joining member 3B in a direction orthogonal to the closed cross-section member 1 is formed on the facing end surface, and the closed cross-section joining member The end face of the closed cross-section member 1 joined in the direction orthogonal by 3B is characterized in that a notch E for positioning that fits with the outer peripheral faces of the two closed cross-section members 1 is formed. . Since other configurations and operations are the same as those of the embodiment described with reference to FIGS. 16 to 18, the same components are denoted by the same reference numerals, and description thereof is omitted.

  FIG. 29 shows another embodiment of the present invention. In this embodiment, when the closed cross-section member 1 to be joined is a square pipe, the joining method of the present invention is applied, and the closed cross-section type joining member 3B as the joining member 3 for the closed cross-section member is used. It is characterized in that it is formed in the shape of a square pipe. Since other configurations and operations are the same as those of the embodiment described with reference to FIGS. 24 to 28, the same components are denoted by the same reference numerals, and description thereof is omitted.

  Furthermore, in the case where a gap is generated between the members by using a ready-made round pipe or square pipe for the closed cross-section type joining member 3B or the closed cross-section member 1, in order to prevent the rattling, FIG. 24 and FIG. As shown, for example, it is also preferable to screw four bolts 7 at the positions of both end portions and / or the central portion of the closed cross-section joining member 3B.

As mentioned above, although embodiment of this invention was described, this invention is not limited only to embodiment mentioned above. For example, in FIGS. 1 and 2, the closed cross-section member 1 for the main material uses a round pipe as in the illustrated example, but the joining member 3 is replaced with a cruciform joining member 3 </ b> A composed of two joining plate materials 2. A round pipe-shaped closed cross-section type joining member 3B as shown in FIG. 25 may be used, and may be joined by the embodiment described in the joining method related to the closed cross-section member 1 provided in the inclined posture shown in FIG.

DESCRIPTION OF SYMBOLS 1 Close cross-section member 2 Joining plate material 3 Joining member 3A Cross-shaped joining member 3B Closed cross-section joining member 4 Positioning pin 5 Pin for connection 6 Pin for temporary fixing 7 Bolt A Pin hole B Pin hole C For positioning Notch D Notch for positioning E Notch for positioning F Notch for positioning G Notch for positioning H Notch for positioning S Slit X, Y Two directions perpendicular to each other a Pin Hole forming recess b Pin hole forming slot

Claims (6)

  A step of forming a joining member having a plurality of pin holes drilled in the direction of the material axis at intervals in two directions perpendicular to each other; and a pin hole is formed in advance at a position corresponding to the pin hole of the joining member. And a step of inserting the joining member into an end portion of the closed cross-section member and a step of driving the pins from two directions perpendicular to each other across the pin hole of the closed cross-section member and the pin hole of the joint member. Cross-section member joining method.   The joining member is formed with an assembly slit in the center in the width direction, and a plurality of semicircular pin hole forming recesses are formed on both side edges of the slit at intervals in the slit longitudinal direction. Two joining plate members in which a plurality of long holes for pin hole formation are formed on a line, the cross-sectional shape becomes a cross shape by fitting the slits together, and a semicircular pin hole forming recess 2. The closed cross-section member according to claim 1, wherein the closed cross-section member is formed by combining a pin hole forming long hole so as to form a circular pin hole obliquely crossing the cross intersection. Joining method.   The joint member has an outer dimension inscribed inside the closed cross-section member according to claim 1, and a plurality of pin holes are drilled in a material axis direction at intervals in two directions perpendicular to each other. The closed cross-section member joining method according to claim 1, wherein the closed cross-section type joint member is formed.   A positioning notch for fitting with a positioning pin driven in a central pin hole in the joining member is formed on the opposing end faces of the two closed cross-section members joined in a straight line. The method for joining closed cross-section members according to any one of claims 1 to 3.   A notch for positioning is formed on the opposing end surfaces of the two closed cross-section members joined in a straight line, and is fitted to the end of the joint member in a direction orthogonal to the closed cross-section member. 2. A positioning notch for fitting with the outer peripheral surfaces of the two closed cross-section members is formed on the end face of the closed cross-section member joined in a direction orthogonal to each other. 4. The method for joining closed-section members according to any one of 3 above.   The positioning notch for positioning by abutting each other is formed on the end faces of the two closed cross-section members joined in a state intersecting at an acute angle. 2. A method for joining closed-section members according to 1.

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