JP2010090603A - Beam structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a beam structure exhibiting sufficient strength to bending moment and lateral fall buckling strength without needing independent joint members, bolts and nuts and a welding process and further special post-working, requiring a low production cost, few assembling man-hours and a small assembling space, and exhibiting sufficient strength to force in a direction to separate an upper beam part and a lower beam part. <P>SOLUTION: The upper beam part 2 and the lower beam part 3 of the same cross-sectional shape are provided with ruggedly-fitted locking parts 2c, 3c and joint flange parts 2d, 3d fixed by clinch type caulking 4, and the upper beam part 2 is slid in a direction orthogonal to the faces of web forming parts 2b, 3b on the lower beam part 3 to fit the locking parts 2c, 3c to thereby fix the upper beam part 2 and the lower beam part 3 vertically. The joint flange parts 2d, 3d are then fixed by clinch type caulking 4 to fix the upper beam part 2 and the lower beam part 3 longitudinally and laterally. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an improvement in a beam structure formed by vertically joining an upper beam portion and a lower beam portion formed by an extruded profile.

  Examples of the beam structure formed by joining the upper beam portion and the lower beam portion vertically or horizontally include, for example, a composite beam disclosed in Patent Document 1, a compound beam disclosed in Patent Document 2, and Patent Document 3 And the composite beam member disclosed in Patent Document 4 are already known.

The composite beam disclosed in Patent Document 1 divides the beam structure into upper and lower parts for the purpose of using a small extruder, reducing the number of materials and processing steps, and reducing the cost, and joining the upper divided beam and the lower divided beam. It has a structure in which an upper joint beam and a lower part beam are joined by fitting a dovetail joint member, which is a kind of splice joint.
However, when an external force in the lateral direction acts, stress tends to concentrate on the joint member, and it is difficult to exhibit sufficient lateral buckling strength. At the same time, the production cost of the joint member and the installation man-hours are reduced. There is also an adverse effect such as an increase.
In addition, when this composite beam is used as a beam, both split beams are used so that no slip occurs on the contact surfaces of the upper and lower split beams even if a strong load is applied to the center with both ends supported. A gear-like unevenness of the joint portion was formed to prevent the meshing slip. However, post-processing was required to form a saw-toothed uneven portion.
In addition, since the long joint member is pushed in along the longitudinal direction of the upper divided beam and the lower divided beam, the longer the composite beam span is, the more difficult it is to assemble the composite beam.

The composite round beam disclosed in Patent Document 2 and the composite beam disclosed in Patent Document 3 are different in that the joint member of the composite beam disclosed in Patent Document 1 is arranged outside. This is the same as Patent Document 1.
Moreover, the point that the long joint member is pushed in along the longitudinal direction of the upper divided beam and the lower divided beam is the same as that of the composite beam disclosed in the above-mentioned Patent Document 1, and if the beam span becomes longer, too. Indeed, the work required to assemble the beam becomes difficult.

  The composite beam member disclosed in Patent Document 4 applies a structure in which the webs of two folded beam members that are bent are overlapped from the left and right directions and integrated using a clinch-type caulking, Due to the characteristics of this type of caulking, sufficient strength cannot be exerted against the force in the direction of peeling the two groove-shaped beam members. In addition, when a composite beam member is to be formed with an extruded profile, it is difficult to manufacture if the beam formation is large.

  The clinch-type caulking itself is already known in Patent Document 5, etc., and it is generally known that the peel strength is weak although it is excellent in tensile shear strength.

In addition to these, a beam structure that uses bolts and nuts to fix the upper and lower beam parts, and a beam structure that fixes the upper and lower beam parts by welding. There is conventionally.
However, in the former case, since the bolt hole is larger than the effective diameter of the bolt, when this beam structure is used as a beam, if a strong load acts on the center part with both ends supported, the upper beam A slight slip in the surface direction occurs on the contact surface between the upper beam and the lower beam, and the upper beam and the lower beam may bend independently, and the bending moment is compared to a fully integrated beam structure. There is a problem that sufficient strength against the above cannot be exhibited.
Regarding this problem, it is possible to prevent slipping by increasing the coefficient of friction by blasting the contact surfaces of the upper beam part and the lower beam part, but the increase in manufacturing cost and processing man-hours I can't escape.
In addition, when the upper beam part and the lower beam part formed by aluminum extrusion are fixed with steel bolts, electrical corrosion occurs due to the difference in ionization tendency of the material, especially in a humid environment. Inconvenience that it becomes easy to do.
On the other hand, in the latter welding type, the joint between the upper beam and the lower beam is remarkably heated during the welding process, so that the material itself is permanently strained or the strength is reduced by heat. In addition, there are many problems that the oxide film for preventing corrosion is damaged by high heat.
Since the aluminum material has a high coefficient of thermal expansion, the effect of heat on the weld deformation and residual strain is great during welding. As a result, the entire beam is deformed. As described above, there is a risk that the strength of the beam with respect to the bending moment is significantly reduced due to a decrease in mechanical strength due to a change in characteristics of the metal itself due to heat and an overall deformation of the beam material.

  Note that the use of a horizontal stiffener extending in the longitudinal direction at the central portion of the beam structure as a reinforcing material for preventing buckling is already known in Patent Document 6, Patent Document 7, and the like.

JP 2006-307601 A (FIGS. 1, 2 and 3) JP 2007-23721 A (FIGS. 1 and 3) JP 2006-336451 A (FIGS. 1 and 3) Japanese Patent Laid-Open No. 2002-4495 (FIGS. 2, 3, and 5) Japanese Patent Laid-Open No. 2001-321856 (FIG. 12, Table 1, Table 2) JP 2006-37577 A (paragraph 0021, FIG. 4) Japanese Patent Laid-Open No. 10-82134 (paragraph 0013, FIG. 3)

  Accordingly, an object of the present invention is to improve the inconveniences of the prior art, without requiring independent joint members, bolts and nuts, welding processes, and special post-processing, and providing sufficient strength against bending moment and side buckling. Providing a beam structure that can exhibit strength, requires only a small amount of production cost, assembly man-hours, and assembly space, and can exhibit sufficient strength against the force in the direction of peeling the upper and lower beam parts. There is.

The present invention is a beam structure constituted by joining the upper beam portion and the lower beam portion up and down, in order to achieve the above-mentioned problem,
The upper beam part consists of a flange part that forms the upper flange of the beam, a joint part with the lower beam part, and a web formation part that connects the flange part and the joint part,
The lower beam part is composed of a flange part that forms a lower flange of the beam, a joint part with the upper beam part, and a web forming part that connects the flange part and the joint part,
In each of the joint part of the upper beam part and the joint part of the lower beam part,
A locking part is formed that is fitted to each other by moving in a direction perpendicular to the longitudinal direction of both beam members and perpendicular to the surface of the web forming part,
On both sides of the joint portion on the upper beam portion side and the joint portion on the lower beam portion side, a joining flange portion is formed that extends to the left and right of the web surface perpendicular to the web surface of each beam portion and overlaps with each other.
In a state where the locking portions of the upper beam portion and the lower beam portion are fitted together,
The left and right joint flange portions of the upper beam portion and the left and right joint flange portions of the lower beam portion are fixed to each other by clinch-type caulking, respectively.

When assembling the beam structure, first, in the relationship between the joint part of the upper beam part and the joint part of the lower beam part, the direction in which the joint part of the upper beam part is orthogonal to the surface of the web forming part of each beam part In this state, the upper beam joint is placed in close contact with the lower beam joint.
Next, the upper beam part and the lower beam part are moved relative to each other so that the upper beam part and the lower beam part are slid in the direction opposite to the offset direction until the center axes of the upper beam part and the lower beam part coincide with each other. The locking portions formed in each of the joint portions of the beam portions are fitted to each other so as to overlap in the overlapping direction of the upper beam portion and the lower beam portion, and the upper beam portion and the upper beam portion are interposed through these locking portions. The lower beam part is fixed in the superposition direction, that is, the vertical direction.
Furthermore, from the both sides of the joint of the upper beam extending from the both sides of the joint of the upper beam in the direction perpendicular to the web surface of each beam, and perpendicular to the web of each beam from both sides of the joint of the upper beam and the joint of the lower beam A clinching-type caulking is applied to the joint flange portion of the lower beam portion that extends in the direction in which the joint flange portion and the joint flange portion of the lower beam portion are aligned along the surface of the joint flange portion. Securely fix it in the right direction, that is, in the front-rear and left-right directions.
When the beam structure is in use, the upper and lower beam sections receive an applied load, and the shear load on the beam neutral plane due to bending deformation is applied between the joint on the lower and upper beam sections. Supported by the contact surface. On the other hand, the tensile force in the direction of peeling off the upper beam part and the lower beam part is based on the fitting surface of the upper beam part and the lower beam part, and the upper flange part and the lower flange part. It is supported by a clinch-type caulking portion that joins the joint flange portion of the beam portion. As already mentioned, clinch-type caulking has excellent tensile shear strength and relatively low peel strength, but the upper beam and lower beam are fixed in the vertical direction by fitting their respective locking parts. Therefore, sufficient strength can be exerted against the force in the direction of peeling the upper beam portion and the lower beam portion.
In addition, clinch-type caulking is excellent in tensile shear strength, so the joint of the upper beam part inadvertently moves back and forth and left and right in the direction along the surface of the joint flange part with respect to the joint part of the lower beam part Such an inconvenience is surely eliminated. Therefore, when this beam structure is used as a beam, even if it receives a load with both ends supported, there will be no inadvertent slippage on the contact surfaces of the upper beam portion and the lower beam portion, and the upper beam portion And the lower upper beam part will always be flexed while being integrated, so that even if compared to a fully integrated beam structure, it will exhibit sufficient strength and rigidity against the bending moment, equivalent to or better than that. Can do.
Furthermore, the joint flange part of the upper beam part and the joint flange part of the lower beam part extend greatly to both sides of the web surface in a manner perpendicular to the web surface of the beam part, so that the bending secondary moment of the weak axis is large. Thus, it is possible to secure a sufficient lateral collapse buckling strength.
Furthermore, the joint flange itself that extends sufficiently on both sides of the web surface in a form perpendicular to the web surface of the beam portion itself is a horizontal stiffener that extends along the longitudinal direction at the center in the vertical direction of the beam structure. As a result, the web face plate can have a higher local buckling strength than a beam structure of the same size without a horizontal stiffener. The web plate may be thinned by improving the local buckling strength by the horizontal stiffener.
Also, when assembling the beam structure, the upper beam part is moved so that it slides slightly over the lower beam part, and the upper beam part becomes the lower beam part. After fitting, they are fixed in the vertical direction, and after that, it is only necessary to clinch the caulking to the joint flange part of the upper beam part and the joint flange part of the lower beam part. Compared to the conventional structure that is pushed along the longitudinal direction of the beam portion and the lower beam portion, the work space required for assembly is very small. In addition, there is no need for bolts and nuts, welding processes, and special post-processing when assembling, so electrical corrosion caused by differences in ionization tendency of the materials that make up bolts and nuts and beam structures, and accompanying heating It is possible to prevent permanent deformation of the material itself, a decrease in strength due to heat, and deformation of the entire beam due to the occurrence of distortion, and to reduce production costs and assembly man-hours.

In order to achieve the same problem as described above, a beam structure configured by vertically joining the upper beam portion, the intermediate beam portion, and the lower beam portion is adopted,
The upper beam part is composed of a flange part that forms the upper flange of the beam, a joint part with the intermediate beam part, and a web forming part that connects the flange part and the joint part,
The lower beam part consists of a flange part that forms the lower flange of the beam, a joint part between the intermediate beam part, and a web forming part that connects the flange part and the joint part,
The intermediate beam portion is composed of an upper joint portion joined to the upper beam portion, a lower joint portion joined to the lower beam portion, and a web forming portion connecting these joint portions,
Each of the upper beam joint and the intermediate beam upper joint
A locking part is formed that is fitted to each other by moving in a direction perpendicular to the longitudinal direction of both beam members and perpendicular to the surface of the web forming part,
In each of the joint part of the lower beam part and the lower joint part of the intermediate beam part,
A locking part is formed that is fitted to each other by moving in a direction perpendicular to the longitudinal direction of both beam members and perpendicular to the surface of the web forming part,
On both sides of the joint portion on the upper beam portion side and the joint portion on the intermediate beam portion side, a joining flange portion is formed which extends to the left and right of the web surface perpendicular to the web surface of each beam portion and overlaps with each other.
On both sides of the joint part on the lower beam part side and the joint part on the intermediate beam part side, a joining flange part is formed that extends perpendicularly to the web surface of each beam part and overlaps with each other and overlaps with each other.
In a state where the locking portions of the upper beam portion and the intermediate beam portion and the locking portions of the lower beam portion and the intermediate beam portion are fitted to each other,
The left and right joint flange portions of the upper beam portion and the left and right joint flange portions of the intermediate beam portion are fixed to each other by clinching caulking, and the left and right joint flange portions of the lower beam portion and the left and right joint flange portions of the intermediate beam portion are fixed. The joint flange portions may be fixed to each other by clinch-type caulking.

  The overall configuration is the same as that of the above-described beam structure except that an intermediate beam portion is interposed between the upper beam portion and the lower beam portion. Further, the number of intermediate beam portions may be only one, or two or more. When there is only one intermediate beam part, a joint flange part that functions as a horizontal stiffener that extends along the longitudinal direction of the beam structure, extending to both sides of the web surface in a manner perpendicular to the web surface of each beam part When there are two overlapping locations, and when there are two intermediate beam portions, the overlapping portions of the joining flange portion functioning as a horizontal stiffener will be formed at three convenient locations, so local buckling strength Further improvement can be expected. The web plate may be further thinned by the local buckling strength of the web face plate by the horizontal stiffener.

  Here, it is desirable that the joining flange portions to be overlapped are fixed by a clinch-type caulking at a plurality of locations with a certain interval along the longitudinal direction of the beam structure.

  By applying clinching-type caulking at a plurality of locations, if there is an abutment surface between the upper beam portion and the lower beam portion, and if there is an intermediate beam portion, the abutment surface between the upper beam portion and the intermediate beam portion and It is possible to completely prevent the occurrence of inadvertent slip occurring on the contact surface between the lower beam portion and the intermediate beam portion. Thereby, the intensity | strength of the beam structure with respect to a bending moment further improves.

  Furthermore, when each beam part is formed by aluminum extrusion, at least the locking part of the upper beam part and the locking part of the lower beam part, and the joint flange part and the lower beam part of the upper beam part It is desirable that the joint flanges have the same cross-sectional shape.

  Since the same extrusion die can be used to form the upper beam locking portion and the lower beam locking portion, and the upper beam bonding flange portion and the lower beam bonding flange portion. This is advantageous in terms of reducing the manufacturing cost of the body.

  Furthermore, an anodic oxide film for preventing corrosion may be formed in advance on each of the beam portions before joining.

  In the assembling process of the beam structure using the locking part of each beam part, the joining flange part, and the clinch-type caulking, a bolt hole drilling operation and a welding process are unnecessary. Therefore, damage to the oxide film due to heating or cutting is prevented, and the initially formed oxide film can be preserved.

According to the beam structure of the present invention, the tensile force in the direction in which the upper beam portion and the lower beam portion are peeled off is such that the engagement surface between the locking portion of the upper beam portion and the locking portion of the lower beam portion, and the upper It is supported by a clinch-type caulking part that joins the joint flange part of the beam part and the joint flange part of the lower beam part. Of these, the strength of the locking part that fixes the upper beam part and the lower beam part is particularly strong. Since it is remarkably higher than the strength, a sufficient strength can be exerted with respect to the force in the direction of peeling off the upper beam portion and the lower beam portion.
In addition, the clinch-type caulking is excellent in tensile shear strength, so the inconvenience that the joint of the upper beam part slips inadvertently with respect to the joint of the lower beam part and moves in the front-rear and left-right directions is reliably eliminated. The As a result, even if a strong load is applied to the center part with both ends supported when the beam structure is used as a beam, inadvertent slippage will not occur on the contact surfaces of the upper and lower beam parts. Because the upper beam and the lower upper beam are always flexed while being integrated, sufficient strength and rigidity against bending moment are equal or better than those of a fully integrated beam structure. Can be demonstrated.
The joint flange itself, which extends sufficiently on both sides of the web surface in a direction perpendicular to the web surface of each beam, functions as a horizontal stiffener extending along the longitudinal direction at the center of the beam structure in the vertical direction. As a result, higher local buckling strength and lateral buckling strength can be obtained as compared with a beam structure having the same size without a horizontal stiffener. The web plate may be thinned by improving the local buckling strength of the web face plate with the horizontal stiffener.
Also, when assembling the beam structure, slightly move the upper beam side joint on the lower beam side joint to slide the upper beam side locking portion to the lower beam side. After that, it is only necessary to apply a clinch-type caulking to the joining flange part of the upper beam part and the joining flange part of the lower beam part. Compared to the conventional structure that is pushed along the longitudinal direction of the lower part and the lower beam part, the work space required for assembly is small. In addition, there is no need for bolts and nuts, welding processes, or special post-processing when assembling, so it is suitable for electrical corrosion and heating caused by differences in ionization tendency of the materials that make up bolts and nuts and beam structures. It is possible to prevent permanent deformation of the accompanying material itself, decrease in strength due to heat, and deformation of the entire beam due to the occurrence of distortion, and to reduce production costs and assembly man-hours.

  Furthermore, it is possible to apply a configuration in which an intermediate beam portion is interposed between the upper beam portion and the lower beam portion. In such a case, both sides of the web surface are orthogonal to the web surface of each beam portion. Since the overlapping part of the joint flange part that functions as a horizontal stiffener extending along the longitudinal direction of the beam structure is formed at a plurality of positions at intervals, local buckling Further improvement in strength and lateral buckling strength can be expected. It is possible to further reduce the thickness of the web plate by improving the local buckling strength of the web plate by the horizontal stiffener.

  In addition, the joining flange portions to be overlapped are fixed by a clinching-type caulking at a plurality of locations at a certain interval along the longitudinal direction of the beam structure, and inadvertently generated on the contact surface of each beam portion. It is possible to completely prevent the occurrence of slipping and further improve the strength of the beam structure against the bending moment.

When changing the aspect ratio of clinch-type caulking, the caulking portion should be long along the longitudinal direction of the beam structure, and short along the direction perpendicular to the web surface of each beam portion. Therefore, it is not necessary to make the overhang width of the joint flange portion so large that it is easy to set a clinch-type caulking on the processing tool.
According to the experiment, the tensile shear strength does not change much even if the caulking aspect ratio is different in the normal range, so that inadvertent slippage occurring on the contact surface of each beam portion is surely generated. It is possible to improve the strength of the beam structure against the bending moment.

  Furthermore, when each beam part is formed by aluminum extrusion, the upper beam part and the lower beam part, and the upper beam part and the lower beam part are joined. Since the cross-sectional shapes of the upper and lower beam parts are the same, the same extrusion die is used for the upper beam part and lower beam part engagement parts, and the upper beam part joint flange part and lower beam part joint flange part. This is advantageous in terms of reducing the manufacturing cost of the beam structure.

Moreover, in the assembly process of the beam structure using the locking part and the joint flange part of each beam part and the clinch-type caulking, the drilling operation and the welding process of the bolt hole are unnecessary. Each of the oxide films previously formed in the stage before joining is not damaged by heating or cutting, and the effect of preventing corrosion is maintained for a long period of time.
Thus, even when a beam structure larger than the extrusion limit by extrusion molding is necessary, it becomes possible to easily obtain a beam structure by combining extruded shapes.
Moreover, since it is based on extrusion molding, a free cross-sectional structure can be formed, for example, by forming two hollow web parts.

  Next, the best mode for carrying out the present invention will be specifically described with reference to the drawings.

  FIG. 1 is a front view showing a cut surface in a direction perpendicular to the longitudinal direction of a beam structure in a configuration example of a beam structure according to an embodiment to which the present invention is applied, and FIG. 2 is an upper beam portion constituting the beam structure. FIG. 3 is a front view showing the configuration of the upper beam portion and the lower beam portion independently, and FIG. 4 shows an outline of the assembly process of the beam structure. FIG. 5 and FIG. 5 are perspective views showing the entire beam structure cut short.

  A beam structure 1 shown in FIG. 1 is a beam structure configured by vertically joining an upper beam portion 2 and a lower beam portion 3.

  As shown in FIG. 1, the upper beam portion 2 includes a flange portion 2e that forms the upper flange of the beam, a joint portion 2a that connects the lower beam portion 3, and a web forming portion that connects the flange portion 2e and the joint portion 2a. 2b, 2b, and the lower beam portion 3 includes a flange portion 3e that forms a lower flange of the beam, a joint portion 3a between the upper beam portion 1, and a web that connects the flange portion 3e and the joint portion 3a. It consists of formation parts 3b and 3b.

  And the joint flange part 2d, 2d extended in the right and left of this web formation part 2b, 2b orthogonally to the surface of the web formation part 2b, 2b of the upper beam part 2 at the junction part 2a of the upper beam part 2 On the other hand, the joint 3a of the lower beam part 3 has a joint flange part 3d extending perpendicularly to the surfaces of the web forming parts 3b, 3b of the lower beam part 3 and extending to the left and right of the web forming parts 3b, 3b. , 3d so that the joining flange portions 2d, 2d of the upper beam portion 2 and the joining flange portions 3d, 3d of the lower beam portion 3 overlap each other.

Furthermore, locking portions 2 c and 2 c are integrally formed at the joint portion 2 a of the upper beam portion 2, and locking portions 3 c and 3 c are integrally formed at the joint portion 3 a of the lower beam portion 3.
As shown in FIG. 4A, the joint portion 2a of the upper beam portion 2 and the joint portion 3a of the lower beam portion 3 are connected to the longitudinal direction of each beam portion 2, 3 and the surface of the web forming portions 2b, 3b. The locking portions 2c, 2c and the locking portions 3c, 3c do not interfere with each other, and the joint between the joint portion 2a of the upper beam portion 2 and the lower beam portion 3 does not interfere with each other. A close contact state with the portion 3a is allowed.
Further, as shown in FIG. 4 (b), the upper beam portion 2 and the lower beam portion 3 are opposite to the aforementioned offset direction, that is, the upper beam portion 2 is directed to the right in FIG. When the upper beam portion 2 is moved relative to the portion 3 so that the central axes of the upper beam portion 2 and the lower beam portion 3 coincide with each other, the locking portions 2c, 2c of the upper beam portion 2 and the lower beam The locking portions 3c and 3c of the portion 3 are overlapped with each other so as to overlap each other in the overlapping direction of the upper beam portion 2 and the lower beam portion 3, that is, in the vertical direction in FIG. The beam portion 3 is fixed in the vertical direction.

In this embodiment, the upper beam portion 2 and the lower beam portion 3 are both formed by an extruded shape obtained by extruding an aluminum alloy, and the locking portions 2c and 2c and the lower beam portion 3 of the upper beam portion 2 are formed. The cross-sectional shapes of the locking portions 3c, 3c of the upper beam portion 2, the bonding flange portions 2d, 2d of the upper beam portion 2, and the bonding flange portions 3d, 3d of the lower beam portion 3 are completely the same. Both the lower beam portion 3 and the lower beam portion 3 have a structure including two web forming portions 2b, 2b or web forming portions 3b, 3b formed with a hollow portion having the same width therebetween.
Therefore, the upper beam portion 2 and the lower beam portion 3 can be formed using the same extrusion die, which is advantageous in terms of reducing the manufacturing cost of the beam structure 1.

  Since the upper beam portion 2 and the lower beam portion 3 have completely the same shape, the detailed shape of the upper beam portion 2 is shown in FIG.

  FIG. 2 is an enlarged view of the state of the connecting portion between the upper beam portion 2 and the lower beam portion 3. In this embodiment, the locking portion 2c of the upper beam portion 2 and the locking portion 3c of the lower beam portion 3 are of a substantially L-shaped cross section, and each is formed in two rows. The two locking portions 2c and the locking portion 3c of the lower beam portion 3 may be in only one row, or may be three or more rows.

  Each of the upper beam portion 2 and the lower beam portion 3 is previously formed with an anodized film for preventing corrosion at a stage before assembly.

  When assembling the beam structure 1, first, as shown in FIG. 4A, the connection portion 2 a of the upper beam portion 2 is connected to each of the beam portions 2, 3 in relation to the connection portion 3 a of the lower beam portion 3. In the direction orthogonal to the surfaces of the web forming portions 2b and 2b and the web forming portions 3b and 3b, that is, in the state offset to the left in FIG. The joint portion 2a of the upper beam portion 2 is placed in close contact therewith.

Next, as shown in FIG. 4B, until the central axes of the upper beam portion 2 and the lower beam portion 3 coincide with each other, the direction of the upper beam portion 2 is opposite to the aforementioned offset direction, that is, toward the right side. Are moved relative to each other so that the locking portions 2c, 2c formed in the joint portion 2a of the upper beam portion 2 and the locking portions 3c, 3c formed in the joint portion 3a of the lower beam portion 3 are The beam portions 2 and 3 are overlapped in the overlapping direction, that is, the vertical direction in FIG.
As a result, as shown in FIG. 2, the locking portions 2c, 2c and the locking portions 3c, 3c are fitted to each other, and the locking portions 2c, 2c and the locking portions 3c, 3c are interposed, The upper beam portion 2 and the lower beam portion 3 are engaged with each other.

  As described above, the locking portions 2c, 2c and the locking portion can be obtained by moving the upper beam portion 2 slightly in the direction orthogonal to the surfaces of the web forming portions 2b, 2b and the web forming portions 3b, 3b. 3c, 3c can be fitted, so that the long joint member is pushed in the longitudinal direction of the upper beam part and the lower beam part, that is, in the direction perpendicular to the paper surface in FIG. 4B. Compared with, the assembly man-hour required for the assembly is reduced, and the work space is also reduced (the conventional joint member has a span almost equal to the entire length of the beam structure 1 as a whole. Even if the joint member has a divided structure, a considerable work space is required).

Next, the joint flange portions 2d and 2d and the lower beam portion of the upper beam portion 2 extending from both sides of the joint portion 2a of the upper beam portion 2 in a direction orthogonal to the surfaces of the web forming portions 2b and 2b of the upper beam portion 2 The clinch type of the overlapping portions of the joint flange portions 3d and 3d of the lower beam portion 3 extending in the direction perpendicular to the surfaces of the web forming portions 3b and 3b of the lower beam portion 3 from both sides of the third joint portion 3a. Apply caulking 4
Thereby, the joining flange portions 2d and 2d of the upper beam portion 2 and the joining flange portions 3d and 3d of the lower beam portion 3 are in a direction along the surface of the joining flange portion, that is, front and rear, left and right in FIG. Secured in the direction.

  6 is a right side view showing the beam structure 1 of FIG. 1, and FIG. 7 is a plan view showing the beam structure 1 of FIG. 1 (however, the plan view is rotated 90 ° clockwise). Stated in state).

  In this embodiment, the joining flange portion 2d and the joining flange portion 3d that overlap vertically are arranged at a certain interval along the longitudinal direction of the beam structure 1, that is, the left-right direction in FIGS. It is fixed by a clinch type caulking 4 at a place.

The clinch-type caulking 4 is excellent in tensile shear strength, and since the joining flange portion 2d and the joining flange portion 3d are fixed at a plurality of locations, the joining portion 2a and the joining flange portion 2d of the upper beam portion 2 are provided. Inconveniences such as inadvertent movement in the direction along the surface of the joint flange portion with respect to the joint portion 3a and the joint flange portion 3d of the lower beam portion 3, particularly in the left-right direction in FIGS. .
Therefore, when this beam structure 1 is used as a beam, even if a load is applied to the beam structure 1 with both ends supported, inadvertent slipping occurs on the contact surfaces of the upper beam portion 2 and the lower beam portion 3. Since the upper beam portion 2 and the lower upper beam portion 3 are always bent while being integrated, the other conditions are equivalent even when compared with the same fully integrated beam structure. Or more than that, sufficient intensity | strength and rigidity with respect to a bending moment may be exhibited.

  Moreover, the clinch-type caulking 4 employed in this embodiment is relatively long along the longitudinal direction of the beam structure 1, that is, the left-right direction in FIGS. It is a substantially rectangular shape formed short along the direction perpendicular to the surfaces of the web forming portions 2b and 2b and the web forming portions 3b and 3b, that is, the vertical direction of FIG. 7, and in particular, the longitudinal direction of the beam structure 1 That is, since it has excellent tensile shear strength when subjected to a tensile shear load acting along the left-right direction in FIGS. 6 and 7, the longitudinal instability generated on the contact surfaces of the upper beam portion 2 and the lower beam portion 3 is excellent. It is effective in preventing the occurrence of prepared slip.

The cross-sectional shape of the clinch-type caulking 4 is shown in the enlarged view of FIG. 8A (cross-section AA in FIG. 1). In addition, the directionality of Fig.8 (a) is the same as the directionality of FIG. FIG. 8B is an enlarged cross-sectional view taken along the line B-B in FIG. 6, and specific dimensions of each part related to the caulking 4 are shown in FIGS. 8C and 8D. In FIG. 8 (d), AA and BB are shown with reference to the cutting directions of FIGS. 8 (a) and 8 (b).
Since the configuration of the punch and die for forming the clinch type crimp 4 is already known, it will not be described here.

  As described above, when assembling the beam structure 1, there is no need for bolts and nuts, welding processes, or special post-processing, so depending on the ionization tendency of the materials constituting the bolts and nuts and the beam structure. It is possible to prevent the electrochemical corrosion that occurs, the constant distortion of the material itself due to heating, the decrease in strength due to heat, and the decrease in mechanical strength due to the occurrence of distortion. It is easy to reduce production costs and assembly man-hours.

  Moreover, since the drilling operation and the welding process of the bolt hole are unnecessary, damage to the oxide film due to heating or cutting is prevented, and the originally formed oxide film can be preserved for a long period of time.

  Of the forces acting on the upper beam portion 2 and the lower beam portion 3 when the assembled beam structure 1 is in use, the force in the direction of pressing the beam structure 1 up and down is the joint 3a of the lower beam portion 3. And the contact surface of the upper beam portion 2 with the joint portion 2a and the contact surface of the joint flange portion 2d of the upper beam portion 2 and the joint flange portion 3d of the lower beam portion 3 are integrated as described above. Therefore, the entire beam structure 1 is supported as a complete beam structure.

Further, the tensile force in the direction of peeling the upper beam portion 2 and the lower beam portion 3 is such that the locking portions 2c, 2c of the upper beam portion 2 and the locking portions 3c, 3c of the lower beam portion 3 as shown in FIG. And a clinch-type caulking portion 4 that joins the joining flange portion 2d of the upper beam portion 2 and the joining flange portion 3d of the lower beam portion 3 to each other.
As can be seen from the enlarged sectional views of FIGS. 8A and 8B showing the structure of the clinch-type caulking 4, the clinch-type caulking 4 itself is not necessarily sufficient with respect to the peel strength, that is, the vertical tensile force. Although not provided with strength, the upper beam portion 2 and the lower beam portion 3 are vertically moved by overlapping and engaging the locking portions 2c and 2c of the upper beam portion 2 and the locking portions 3c and 3c of the lower beam portion 3. Since the beam structure 1 as a whole is fixed in the direction, the upper beam portion 2 and the lower beam portion 3 are exclusively dependent on the strength of the locking portions 2c and 2c and the locking portions 3c and 3c. A sufficient strength can be exerted even with respect to the force in the direction of peeling off.

  Further, the joining flange portion 2d of the upper beam portion 2 and the joining flange portion 3d of the lower beam portion 3 are orthogonal to the surfaces of the web forming portions 2b and 2b and the web forming portions 3b and 3b of the respective beam portions 2 and 3. Since each web forming portion extends greatly on both the left and right sides, and the secondary axial moment of the beam increases, the overall lateral buckling strength of the beam also increases.

  Moreover, the joining flanges 2d and 3d themselves that extend sufficiently on both sides of each web forming portion in a manner perpendicular to the surfaces of the web forming portions 2b and 2b and the web forming portions 3b and 3b of the respective beam portions 2 and 3 are provided. As shown in FIG. 6, since it functions as a horizontal stiffener extending along the longitudinal direction at the central portion in the vertical direction of the beam structure 1, it has an equivalent size without a horizontal stiffener. Compared to the beam structure, higher local buckling strength and lateral buckling strength can be obtained. At this time, the web plate can be thinned in accordance with the improvement of the local buckling strength and the lateral buckling strength due to the horizontal stiffener, which also saves material.

  Next, the results of the strength test and durability test of each part of the beam structure 1 will be briefly described.

9 and 10 are the same as those of the beam portions 2 and 3 in order to test the tensile shear strength of the clinch-type caulking 4 that fixes the joint flange portion 2d and the joint flange portion 3d in the beam structure 1 of the embodiment. It is the figure shown about the test pieces 5 and 6 formed with the material.
The test piece 5 corresponds to the joining flange portion 2 d of the upper beam portion 2, and the test piece 6 corresponds to the joining flange portion 3 d of the lower beam portion 3.
The thickness of the test pieces 5 and 6 is 3.8 mm as in the joint flange portions 2d and 3d of the embodiment, and the vertical and horizontal lengths of the test pieces 5 and 6 are 150 mm × 40 mm as shown in FIGS. Then, the end portions in the longitudinal direction of the test pieces 5 and 6 are polymerized by 50 mm, and clinch-type caulking 4 is applied to the superposed portion.
The size of the caulking 4 is the same as that of the beam structure 1 of the embodiment, as shown in FIGS. 8C and 8D, the longitudinal dimension of the rectangular portion on the surface is 15.5 mm, The width is 6 mm (refer to FIG. 8D), the dimension from the surface to the bottom portion is 6 mm, and the longitudinal dimension of the bottom portion is 8.6 mm (refer to FIG. 8C). Yes.
Among these, the test pieces 5 and 6 in FIG. 9 are subjected to the clinch-type caulking 4 so that the longitudinal direction of the clinch-type caulking 4 is orthogonal to the tensile direction (vertical direction in FIG. 9). The ten test pieces 5 and 6 are provided with the clinch-type caulking 4 so that the longitudinal direction of the clinch-type caulking 4 coincides with the tensile direction (vertical direction in FIG. 10).
Therefore, it is long along the longitudinal direction of the beam structure 1 of this embodiment, that is, the left-right direction of FIGS. 6 and 7, and the web forming portions 2b and 2b and the web forming portions 3b and 3b of the respective beam portions 2 and 3 The caulking 4 under the same conditions as the caulking 4 of the present embodiment having an aspect ratio that is formed short in the direction orthogonal to the plane, that is, the vertical direction of FIG. 7, is the caulking 4 that is shown in FIG. Become.
Note that a testing machine that grips the ends of the test pieces 5 and 6 and measures the load in the tensile direction is already known.

Further, FIG. 11 shows the same material as the beam portions 2 and 3 in order to test the peel strength of the clinch type caulking 4 that fixes the joining flange portion 2d and the joining flange portion 3d in the beam structure 1 of the present embodiment. It is the figure shown about the cross tension test body comprised by the formed test pieces 7 and 8. FIG.
The test piece 7 corresponds to the joining flange portion 2 d of the upper beam portion 2, and the test piece 8 corresponds to the joining flange portion 3 d of the lower beam portion 3.
The thickness of the test pieces 7 and 8 is 3.8 mm as in the joint flange portions 2d and 3d of the embodiment, and the vertical and horizontal lengths of the test pieces 7 and 8 are both 150 mm × 50 mm as shown in FIG. Then, polymerization is performed in a state where the central portions of the test pieces 7 and 8 are orthogonal to each other, and clinch-type caulking 4 is applied to the polymerization portion.
The size of the caulking 4 is the same as described above, the longitudinal dimension of the rectangular portion on the surface is 15.5 mm, the width in the direction orthogonal thereto is 6 mm, the dimension from the surface to the bottom portion is 6 mm, the longitudinal direction of the bottom portion The dimension is 8.6 mm.
A testing machine that measures the load in the peeling direction by pulling up the test piece 7 in the direction perpendicular to the paper surface of FIG. 11 with the test piece 8 fixed is known. The holes of the test pieces 7 and 8 are used when the test pieces 7 and 8 are attached to the testing machine, and are not related to the content of the test itself.

First, the result of the tensile shear test using the test pieces 5 and 6 in FIG. 9, the result of the tensile shear test using the test pieces 5 and 6 in FIG. The results of the peel strength test using 8) are summarized in the table of FIG.
In the table of FIG. 12, the caulking in the vertical direction is the result of the tensile shear test by applying a tensile force in the direction perpendicular to the longitudinal direction of the caulking in the specimen of FIG. 9, and the caulking in the parallel direction is caulking in the specimen of FIG. It is the result of a tensile shear test in which a tensile force is applied in a direction parallel to the longitudinal direction of the film.
From the table, there was no significant difference in tensile shear strength between the longitudinal direction of crimping and the direction perpendicular thereto.
Each test result is an average value of three tests in which three sets of similar test pieces were prepared and repeated.

FIG. 13 is a PN diagram showing the results of a one-sided shear fatigue test for clinch-type caulking four joints, and a test piece similar to FIG. 10 was used.
The horizontal axis is the number of repetitions of the fatigue test, and the vertical axis is the fatigue fracture load. The load ratio (R) was 0.1.
If the specimen does not break beyond 10 ⁷ repetitions, the test is discontinued and the fatigue strength is 10 ⁷ times. That is, fatigue strength corresponding to 10 ⁷ times clinch type caulking 4 joint is 2444N.

FIG. 14 is a schematic diagram showing a simplified configuration of a testing machine for performing a bending test on the upper beam portion 2 and the lower beam portion 3 constituting the beam structure 1 of the present embodiment.
This bending tester 9 is a device for reproducing the situation when the beam structure 1 is used as a beam with simple support at both ends.
The beam structure 1 subjected to the bending test is a beam structure 1 having a cross-sectional shape as shown in FIG. 1, and the height of the upper beam portion 2 and the lower beam portion 3 are both 125 mm, that is, the total height is 250 mm. The horizontal widths of the flange portions 2d and 3d, the flange portion 2e of the upper beam portion 2 and the flange portion 3e of the lower beam portion 3 are both 100 mm, the thicknesses of the web forming portions 2b and 3b are both 2.5 mm, and the junction flange portion. The thicknesses of 2d and 3d are both 3.8 mm, and the thickness of the flange portion 2e of the upper beam portion 2 and the thickness of the flange portion 3e of the lower beam portion 3 are both 5 mm, and are actually bent as shown in FIG. The length of the part is 3800 mm, and a load is applied to the center part.
The clinch-type caulking 4 is provided intermittently at an interval of 100 mm along the longitudinal direction of the beam structure 1, that is, the left-right direction in FIG.
The rollers 10 and 11 function as a roller for supporting both ends of the beam structure 1 to maintain a horizontal state and preventing unnecessary external force, resistance, or restraining force from acting on both ends of the beam structure 1. To do.
The pressing tool 12 is a means for applying a vertical load to the central portion of the beam structure 1 while preventing unnecessary resistance and restraining force from acting on the central portion of the beam structure 1.

The results of the bending test are shown in the diagram of FIG. The horizontal axis is the deflection of the central portion of the beam structure 1, and the vertical axis is the load. For the sake of comparison, the theoretical deflection amount of the fully integrated beam structure having the same shape and dimensions is also shown. It is described.
As can be seen from FIG. 15, the deflection amount with respect to the same load is the same for both the completely integrated beam structure and the beam structure 1 of the embodiment including the upper beam portion 2 and the lower beam portion 3.
That is, the beam structure 1 of this embodiment has no inferiority to the fully integrated beam structure having the same shape and dimensions as far as the bending load is concerned.

FIG. 16 is a diagram showing the relationship between the load and deflection of the beam structure 1 before and after the three-point bending fatigue test. For convenience of comparison, the beam structure 1 after repeating the three-point bending fatigue test 100,000 times using a hydraulic servo pulser, and the unused beam structure 1 under the same conditions as shown in FIG. The relationship between the load and the deflection of the central portion is independently described for each of the fully integrated beam structures having the same conditions as those shown in FIG.
As for the dimensions of the beam structure 1 and the unused beam structure 1 after repeating the 100,000-point three-point bending fatigue test, the heights of the upper beam portion 2 and the lower beam portion 3 are both 125 mm and the total height is the same as described above. The width of the flange portions 2e and 2d of the upper beam portion 2 and the flange portion 3e of the lower beam portion 3 are both 100 mm, the thicknesses of the web forming portions 2b and 3b are both 2.5 mm, and the joint flange is 250 mm. The thicknesses of the portions 2d and 3d are both 3.8 mm, the thickness of the flange portion 2e of the upper beam portion 2 and the thickness of the flange portion 3e of the lower beam portion 3 are both 5 mm, and the clinch type caulking 4 is the beam structure 1 Are provided intermittently at intervals of 100 mm along the longitudinal direction, and the length of the actually bent portion is 3800 mm (total length is 4000 mm). The dimensions of the fully integrated beam structure are the same.
In a 100,000 fatigue test, the maximum load is 2000 kgf, the load ratio (R) is 0.1, and the repetition rate is 0.6 Hz.
As can be seen from FIG. 16, the bending strength of the beam structure 1 after repeating the 100,000 three-point bending fatigue test is equal to the bending strength of the unused beam structure 1 or a completely integrated beam structure. It can be seen that even when the beam structure 1 is divided into the upper beam portion 2 and the lower beam portion 3, the bending rigidity is hardly deteriorated due to the alternating load.

Next, the fixing effect of the upper beam portion 2 and the lower beam portion 3 obtained by fitting the locking portions 2c, 2c of the upper beam portion 2 and the locking portions 3c, 3c of the lower beam portion 3, and the upper beam portion This was performed in order to confirm the fixing effect of the upper beam portion 2 and the lower beam portion 3 obtained by the clinch-type caulking 4 that joins the joint flange portions 2d and 2d of the second beam 2 and the flange portions 3d and 3d of the lower beam portion 3. A peel test will be described.
The beam structure 1 used in this peel test is shown in FIGS. 1, 4 (b) to 5, and the dimensions are such that the upper beam portion 2 and the lower beam portion 3 are both 125 mm in height and the total height is The width of the flange portions 2e and 2d of the upper beam portion 2 and the flange portion 3e of the lower beam portion 3 are both 100 mm, the thicknesses of the web forming portions 2b and 3b are both 2.5 mm, and the joint flange is 250 mm. The thicknesses of the portions 2d and 3d are both 3.8 mm, the flange portions 2e of the upper beam portion 2 and the flange portions 3e of the lower beam portion 3 are both 5 mm, and the locking portion 2c of the upper beam portion 2 and the lower The plate thickness of the locking portion 3c of the beam portion 3 is 3 mm, and the fitting width between them is 4.5 mm. The dimension in the longitudinal direction, that is, the depth direction in FIG. 4B to FIG. 5 is 100 mm.
In this test, three beam structures 1 having the same dimensions are prepared, one of which is not subjected to clinch-type caulking 4, and the locking portions 2c, 2c of the upper beam portion 2 and the lower beam portion 3 are provided. The upper beam portion 2 and the lower beam portion 3 were fixed only by fitting with the locking portions 3c, 3c, and a test body A was obtained. The other one is a state in which the engaging portions 2c, 2c of the upper beam portion 2 and the engaging portions 3c, 3c of the lower beam portion 3 are fitted, and further, one joining flange that forms a pair on the left and right A clinch-type caulking 4 was applied to each of the central portions of the portions 2d and 3d and the other joining flange portions 2d and 3d to obtain a test body B (therefore, the total number of caulking 4 was convenient at two locations). The last one is a state in which the engaging portions 2c, 2c of the upper beam portion 2 and the engaging portions 3c, 3c of the lower beam portion 3 are fitted together, and further, one joining flange that forms a pair on the left and right A clinching type caulking 4 is applied to a position where the longitudinal direction of the parts 2d and 3d and the other joining flanges 2d and 3d is equally divided into 3 in the longitudinal direction to obtain a specimen C (therefore, the total number of caulking 4 4 places for 2 places).
Then, with respect to each of the test bodies A, B, and C, a peel test is performed by pulling the upper beam portion 2 and the lower beam portion 3 relatively apart from each other, that is, in the vertical direction of FIGS. The results are shown in the table of FIG.
As shown in FIG. 17, the peel strength of Specimen B is about 1.3 times the peel strength of Specimen A, and the peel strength of Specimen C is about 1.4 times the peel strength of Specimen A. ing. Also, the difference between the peel strength of the test specimen A and the peel strength of the test specimen B divided by 2 (4640 N / 1 caulking location) and the difference between the peel strength of the test specimen A and the peel strength of the test specimen C are divided by four. Therefore, even if the number of clinch-type caulking 4 is increased, the peel strength is proportionally increased in accordance with the increase. hard. In any case, most of the strength against peeling depends exclusively on the fixing force (32644N) generated by the engagement between the locking portions 2c, 2c of the upper beam portion 2 and the locking portions 3c, 3c of the lower beam portion 3. Presumed to be.
That is, as described above, the clinch-type caulking 4 itself does not necessarily have sufficient strength with respect to peeling strength, that is, vertical tension, but the upper beam portion 2 and the lower beam portion 3 are locked to the upper beam portion 2. Since the portions 2c and 2c and the locking portions 3c and 3c of the lower beam portion 3 are fitted and fixed so as to overlap, the beam structure 1 as a whole is exclusively associated with the locking portions 2c and 2c. It can be said that the strength is exerted with respect to the force in the direction in which the upper beam portion 2 and the lower beam portion 3 are peeled off, depending on the strength of the stop portions 3c, 3c.

  FIG. 18 is a front view showing a configuration of a beam structure 13 according to another embodiment to which the present invention is applied, in a cross section cut in a direction perpendicular to the longitudinal direction of the beam structure 13.

  In this embodiment, instead of the two-plate-shaped web forming portion in which the hollow portion is formed, a single-plate-shaped web forming portion having no hollow portion is adopted, and the upper beam portion and the lower beam portion are joined. It differs from the above-described embodiment in that only one set of single-row locking pieces is adopted for each joint portion instead of the locking portions formed in two rows in each portion.

  The beam structure 13 includes an upper beam portion 14 and a lower beam portion 15. The upper beam portion 14 includes a flange portion 14e that forms the upper flange of the beam, a joint portion 14a that connects the lower beam portion 15, a web formation portion 14b that connects the flange portion 14e and the joint portion 14a, and a lower portion. The beam portion 15 includes a flange portion 15e that forms a lower flange of the beam, a joint portion 15a that connects the upper beam portion 14, and a web formation portion 15b that connects the flange portion 15e and the joint portion 15a.

  The joint portion 14a of the upper beam portion 14 is formed with joint flange portions 14d and 14d extending right and left of the web forming portion 14b perpendicular to the surface of the web forming portion 14b of the upper beam portion 14. The joint portion 15a of the lower beam portion 15 is formed with joint flange portions 15d and 15d extending perpendicularly to the surface of the web forming portion 15b of the lower beam portion 15 and extending to the left and right of the web forming portion 15b. The joining flange portions 14d and 14d of the beam portion 14 and the joining flange portions 15d and 15d of the lower beam portion 15 are superposed with each other.

Further, a locking portion 14 c is integrally formed with the joint portion 14 a of the upper beam portion 14, and a locking portion 15 c is integrally formed with the joint portion 15 a of the lower beam portion 15.
When the joint 14a of the upper beam 14 and the joint 15a of the lower beam 15 are slightly offset in the direction perpendicular to the web forming portions 14b and 15b of the respective beams 14 and 15, The portion 14c and the locking portion 15c do not interfere with each other, and the contact state between the joint portion 14a of the upper beam portion 14 and the joint portion 15a of the lower beam portion 15 is allowed (not shown).
Further, as shown in FIG. 18, when the central axes of the upper beam portion 14 and the lower beam portion 15 are aligned, the locking portion 14 c of the upper beam portion 14 and the locking portion 15 c of the lower beam portion 15 are The upper beam portion 14 and the lower beam portion 15 overlap each other in the overlapping direction, that is, in the vertical direction in FIG. 18, and are fixed to each other to fix the upper beam portion 14 and the lower beam portion 15 in the vertical direction.

  Both the upper beam portion 14 and the lower beam portion 15 are formed of an extruded shape of an aluminum alloy. The locking portion 14c of the upper beam portion 14, the locking portion 15c of the lower beam portion 15, and the upper beam portion 14 The joint flange portions 14d and 14d and the joint flange portions 15d and 15d of the lower beam portion 15 have completely the same cross-sectional shape, and can be formed using extruded profiles having the same cross-sectional shape.

  Since the upper beam portion 14 and the lower beam portion 15 have the same shape, the detailed shape of the upper beam portion 14 is shown in FIG. 19 as an example. That is, the upper beam portion 14 shown in FIG. 19 is rotated by 180 ° in the plane of FIG. 19 and the lower beam portion 15 shown in FIG. 18 is the same.

As described above, the difference from the beam structure 1 shown in the embodiment of FIG. 1 is that there is no hollow portion instead of the two-plate-shaped web forming portions 2b, 2b and 3b, 3b in which the hollow portion is formed. A single row instead of a locking portion formed in two rows at the point where the single-plate web-forming portion 14b and the web-forming portion 15b are employed, and the joint portion of the upper beam portion and the lower beam portion, respectively. This is that only one set of the locking pieces 14c, 15c is employed.
Other configurations, assembly methods, and effects are the same as those in the above-described embodiment shown in FIG.
In FIG. 18, reference numeral 14e denotes a flange part that forms the upper flange of the upper beam part 14, reference numeral 15e denotes a flange part that forms the lower flange of the lower beam part 15, and reference numeral 16 denotes a clinch type. It is a caulking.

  FIG. 20 is a front view showing a cut surface in a direction perpendicular to the longitudinal direction of the beam structure 17 in the configuration of the beam structure 17 of still another embodiment to which the present invention is applied.

  This beam structure 17 is a beam structure formed by vertically joining three beam components, that is, an upper beam portion 18, an intermediate beam portion 19, and a lower beam portion 20, and an upper beam portion and a lower beam portion. The configuration differs from the above-described two embodiments in that an intermediate beam portion is interposed therebetween.

  FIG. 21 shows details of the shape of each part in a state where the upper beam part 18, the intermediate beam part 19, and the lower beam part 20 are divided.

  The structure (excluding dimensions) of the upper beam portion 18 is the same as that of the upper beam portion 2 of the embodiment shown in FIG. 1, and the web forming portions 18b and 18b, the joint portion 18a, and the locking portions 18c and 18c. The flange portions 18e forming the upper flanges are provided with the joint flange portions 18d and 18d.

  Further, the structure (excluding dimensions) of the lower beam portion 20 is the same as that of the lower beam portion 3 of the embodiment shown in FIG. 1, and the web forming portions 20b and 20b, the joint portion 20a, and the locking portions 20c, 20c, joint flange portions 20d and 20d, and a flange portion 20e forming a lower flange.

The intermediate beam portion 19 is a configuration unique to the present embodiment. As shown in FIG. 21, the intermediate beam portion 19 includes an upper joint portion 19au joined to the upper beam portion 18, a lower joint portion 19al joined to the lower beam portion 20, and the joint portions 19au and 19al. It consists of connecting web forming sections 19b and 19b. The web forming portions 19b and 19b are two-plate-shaped web forming portions formed with hollow portions.
Then, the upper joint portion 19au joined to the upper beam portion 18 includes the joint portion 18a of the upper beam portion 18 and the upper joint portion 19au of the intermediate beam portion 19 as surfaces of the web forming portions 18b and 19b of the respective beam portions 18 and 19. In the state of being offset in a direction perpendicular to the upper beam portion 18, the upper beam portion 18 is allowed to be in close contact with the joint portion 18 a of the upper beam portion 18 and the upper joint portion 19 au of the intermediate beam portion 19 (not shown). And the upper beam 18 and the intermediate beam 19 are overlapped in the overlapping direction, that is, the vertical direction in FIG. The locking portions 19cu and 19cu are integrally provided.
Further, on both sides of the upper joint portion 19au of the intermediate beam portion 19, a joining flange portion 19du extending perpendicular to the surfaces of the web forming portions 19b, 19b of the intermediate beam portion 19 and extending to both sides of the web forming portions 19b, 19b. , 19 du are provided integrally.

Similarly to these, the lower joint portion 19al joined to the lower beam portion 20 in the intermediate beam portion 19 is connected to the lower joint portion 19al of the intermediate beam portion 19 and the joint portion 20a of the lower beam portion 20 in the webs of the respective beam portions 19 and 20. One that allows close contact between the lower joint portion 19al of the intermediate beam portion 19 and the joint portion 20a on the lower beam portion 20 side in an offset state in a direction orthogonal to the surfaces of the forming portions 19b and 20b (hereinafter, illustrated) Abbreviation), in a state where the central axes of the intermediate beam portion 19 and the lower beam portion 20 coincide with each other, the overlapping portions of the intermediate beam portion 19 and the lower beam portion 20, that is, overlap in the vertical direction in FIG. Locking portions 19cl and 19cl that fit with 20c and 20c are integrally provided.
Further, on both sides of the lower joint portion 19al of the intermediate beam portion 19, a joining flange portion extending perpendicularly to the surfaces of the web forming portions 19b, 19b of the intermediate beam portion 19 and extending to both sides of the web forming portion surfaces 19b, 19b. 19dl and 19dl are provided integrally.

  In this embodiment, the upper beam portion 18 and the lower beam portion 20 and the intermediate beam portion 19 are both formed by aluminum extrusion molding, and the locking portions 18c and 18c of the upper beam portion 18 and the lower beam portion 20 are formed. The cross-sectional shapes of the locking portions 20c and 20c, the joining flange portions 18d and 18d of the upper beam portion 18, and the joining flange portions 20d and 20d of the lower beam portion 20 are completely the same. Since the lower beam portion 20 also has a structure including two web forming portions 18b and 18b or web forming portions 20b and 20b formed with a hollow portion having the same width therebetween, The beam portion 20 can be formed by using the extruded shape having the same shape, which is advantageous in reducing the manufacturing cost of the beam structure 17.

  That is, the upper beam portion 18 and the lower beam portion 20 have the same shape, and the upper beam portion 18 shown in FIG. 21 is rotated by 180 ° in the plane of FIG. 21, and the lower beam portion shown in FIG. 20 is the same shape.

The method of assembling the beam structure 17 is basically the same as that of the embodiment shown in FIG. 1, but the beam structure 17 of the present embodiment has an upper beam portion 18 and an intermediate beam portion. 19 and the lower beam portion 20 exist, so that the lower beam portion 20 and the intermediate beam portion 19 are first assembled, and then the upper beam portion 18 is reassembled on the intermediate beam portion 19. Good.
The assembly work of the intermediate beam part 19 with respect to the lower beam part 20 can be performed in the procedure as shown in FIG. 4A and FIG. 4B, and the assembly work to the lower beam part 20 is similarly completed. The work of assembling the upper beam portion 18 with respect to the intermediate beam portion 19 can also be performed according to the procedure shown in FIGS. 4 (a) and 4 (b).

  Reference numeral 21 in FIG. 20 denotes a clinch type crimp.

The beam structure 17 shown in FIG. 20 is formed by combining the upper beam portion 18, the intermediate beam portion 19, and the lower beam portion 20 together, so that two sets of horizontal stiffeners, that is, the upper beam portion 18 as a whole. A first horizontal stiffener composed of a joint flange portion 18d and a joint flange portion 19du of the intermediate beam portion 19, and a second horizontal stiffener comprising a joint flange portion 19dl of the intermediate beam portion 19 and a joint flange portion 20d of the lower beam portion 20. Since the stiffener is provided, it can be expected that the local buckling strength of the web face plate and the lateral collapse buckling strength of the entire beam will be improved. Thereby, the web board can be further thinned.
It is apparent from the test results of FIG. 15 regarding the bending load and the test results of FIG. 16 regarding the fatigue strength that the beam structure is divided into three or more in the vertical direction so that the bending strength and the fatigue strength do not decrease.
That is, as can be seen from the test results of FIGS. 15 and 16, there is no clear difference in bending strength and fatigue strength between the completely integrated beam structure and the beam structure 1 divided into two vertically. Since it does not occur, it is considered that the performance of the beam structure 17 configured to be divided into three vertically is equivalent to that of the beam structure 1 configured to be divided vertically two.

  In this embodiment, since the cross-sectional shapes of the upper beam portion 18 and the lower beam portion 20 are different from the cross-sectional shape of the intermediate beam portion 19, the upper beam portion 18 and the lower beam portion 20 have the same shape. However, the intermediate beam portion 19 is an extruded shape having a different shape. However, as a result of dividing the whole into three, it is possible to produce beams larger than the size possible with the prepared extruder.

  Since other effects produced by the beam structure 17 are the same as those in the embodiment shown in FIG. 1, detailed description thereof will be omitted.

  In this embodiment, only one intermediate beam part 19 is interposed between the upper beam part 18 and the lower beam part 20, but if necessary, the same beam is provided between the upper beam part 18 and the lower beam part 20. It is also possible to interpose a plurality of intermediate beam portions 19 having the same shape and dimensions.

  Further, a plurality of types of intermediate beam portions 19 having different height dimensions are standardized and manufactured, and the intermediate beam portions 19 having different height dimensions or the intermediate beam portions 19 having different height dimensions according to the total height required for the beam structure 17. It is also possible to select a combination of the beam portions 19 as appropriate, and to obtain a beam structure 17 having a desired height by interposing between the upper beam portion 18 and the lower beam portion 20.

In the above description, the upper beam portion and the lower beam portion are formed by the extruded shape having the same shape, but may have different shapes.
Moreover, it is also possible to make the flange part of the beam structure 17 into shapes other than a plane.
In this case, the cross-sectional shape can be freely designed in order to form with an extruded shape, and the web forming portion can be deformed into a shape that is not a flat plate and other components can be easily attached.

It is the front view shown in the direction along the longitudinal direction of the beam structure about the example of composition of the beam structure of one embodiment to which the present invention is applied. It is the fragmentary front view which expanded and showed about the junction location of the upper beam part and lower beam part which comprise the beam structure of the embodiment. It is the front view which showed independently the structure of the upper beam part which comprises the beam structure of the embodiment, and a lower beam part. It is the assembly process figure shown about the outline of the assembly process of the beam structure of the embodiment. It is the perspective view which cut | disconnected the beam structure of the same embodiment short, and showed the whole. It is the right view of FIG. 1 which showed the beam structure of the embodiment. FIG. 2 is a plan view of FIG. 1 showing the beam structure of the same embodiment (however, the plan view is shown in a state where the beam structure is rotated 90 ° in the clockwise direction). FIG. 8A and FIG. 8C are enlarged cross-sectional views showing the structure of a clinch-type caulking that fixes joint flanges in the beam structure according to the embodiment, and FIGS. As for the cross section, FIG. 8 (b) shows the BB cross section of FIG. 6, and FIG. 8 (d) shows the planar shape of the caulking. FIG. 9A is a view showing a test piece formed of the same material in order to test the tensile shear strength of a clinch-type caulking that fixes a joint flange portion in the beam structure of the embodiment, and FIG. FIG. 9B is a right side view thereof. FIG. 10A is a front view of a test piece formed of the same material in order to test the tensile shear strength of a clinch-type caulking that fixes a joint flange portion in the beam structure of the embodiment. FIG. 10B is a right side view thereof. It is the front view shown about the cross tension test body comprised by the test piece formed from the same material in order to test the peeling strength of the clinch type crimping which fixes a joining flange part in the beam structure of the embodiment. It is the graph which showed collectively the result of the tensile shear test, and the result of the peel strength test. It is the diagram which showed the result of the fatigue test with respect to the clinch type caulking which fixes a joining flange part in the beam structure of the embodiment (relationship between the maximum load and the number of repetitions). It is the schematic diagram which simplified and showed the structure of the testing machine for performing a bending test with respect to the upper beam part and lower beam part which comprise the beam structure of the embodiment. It is the diagram which showed together the amount of bending of the theory and the result of a bending test of a fully integrated beam structure. It is the diagram which showed the relation between the load and the deflection before and after the three-point bending fatigue test of the beam structure of the same embodiment, for convenience of comparison, the beam structure after 100,000 three-point bending fatigue test, and fatigue For each of the theoretical values of the beam structure before the test and the fully integrated beam structure, the relationship between the load and the deflection of the central portion is described independently. It is the graph shown about the test result of the peeling strength regarding the beam structure of the embodiment. It is the front view shown with the direction along the longitudinal direction of a beam structure about the composition of the beam structure of other one embodiment to which the present invention is applied. It is the front view which showed independently the structure of the upper beam part which comprises the beam structure of the embodiment, and a lower beam part. It is the front view shown with the direction along the longitudinal direction of a beam structure about the composition of the beam structure of another embodiment to which the present invention is applied. It is the front view which showed the detail of the shape of the upper beam part which comprises the beam structure of the embodiment, an intermediate beam part, and a lower beam part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Beam structure 2 Upper beam part 2a Joining part 2b Web formation part 2c Locking part 2d Joining flange part 2e Flange part 3 Lower beam part 3a Joining part 3b Web formation part 3c Locking part 3d Joining flange part 3e Flange part 4 Clinch Type caulking 5, 6, 7, 8 test piece 9 bending test machine 10, 11 roller 12 pressing tool 13 beam structure 14 upper beam part 14a joint part 14b web forming part 14c locking part 14d joint flange part 14e flange part 15 Lower beam portion 15a Joint portion 15b Web forming portion 15c Locking portion 15d Joint flange portion 15e Flange portion 16 Clinch-type caulking 17 Beam structure 18 Upper beam portion 18a Joint portion 18b Web forming portion 18c Locking portion 18d Joint flange portion 18e Flange portion 19 Intermediate beam portion 19au Upper joint portion 19al Lower joint portion 19b Web forming portion 19cu Locking portion 19cl Part 19du joining flange portion 19dl joint flange section 20 under the beam portion 20a joints 20b web forming portion 20c locking portion 20d joining flange portions 20e flange 21 crimping clinch formula

Claims (8)

A beam structure constructed by joining an upper beam part and a lower beam part up and down,
The upper beam part consists of a flange part that forms the upper flange of the beam, a joint part with the lower beam part, and a web formation part that connects the flange part and the joint part,
The lower beam part is composed of a flange part that forms a lower flange of the beam, a joint part with the upper beam part, and a web forming part that connects the flange part and the joint part,
In each of the joint part of the upper beam part and the joint part of the lower beam part,
A locking part is formed that is fitted to each other by moving in a direction perpendicular to the longitudinal direction of both beam members and perpendicular to the surface of the web forming part,
On both sides of the joint portion on the upper beam portion side and the joint portion on the lower beam portion side, a joining flange portion is formed that extends to the left and right of the web surface perpendicular to the web surface of each beam portion and overlaps with each other.
In a state where the locking portions of the upper beam portion and the lower beam portion are fitted together,
A beam structure characterized in that the left and right joint flange portions of the upper beam portion and the left and right joint flange portions of the lower beam portion are fixed to each other by a clinch-type caulking. A beam structure configured by vertically joining an upper beam portion, an intermediate beam portion, and a lower beam portion,
The upper beam part is composed of a flange part that forms the upper flange of the beam, a joint part with the intermediate beam part, and a web forming part that connects the flange part and the joint part,
The lower beam part consists of a flange part that forms the lower flange of the beam, a joint part between the intermediate beam part, and a web forming part that connects the flange part and the joint part,
The intermediate beam portion is composed of an upper joint portion joined to the upper beam portion, a lower joint portion joined to the lower beam portion, and a web forming portion connecting these joint portions,
Each of the upper beam joint and the intermediate beam upper joint
A locking part is formed that is fitted to each other by moving in a direction perpendicular to the longitudinal direction of both beam members and perpendicular to the surface of the web forming part,
In each of the joint part of the lower beam part and the lower joint part of the intermediate beam part,
A locking part is formed that is fitted to each other by moving in a direction perpendicular to the longitudinal direction of both beam members and perpendicular to the surface of the web forming part,
On both sides of the joint portion on the upper beam portion side and the joint portion on the intermediate beam portion side, a joining flange portion is formed which extends to the left and right of the web surface perpendicular to the web surface of each beam portion and overlaps with each other.
On both sides of the joint part on the lower beam part side and the joint part on the intermediate beam part side, a joining flange part is formed that extends perpendicularly to the web surface of each beam part and overlaps with each other and overlaps with each other.
In a state where the locking portions of the upper beam portion and the intermediate beam portion and the locking portions of the lower beam portion and the intermediate beam portion are fitted to each other,
The left and right joint flange portions of the upper beam portion and the left and right joint flange portions of the intermediate beam portion are fixed to each other by clinching caulking, and the left and right joint flange portions of the lower beam portion and the left and right joint flange portions of the intermediate beam portion are fixed. A beam structure characterized in that the joint flanges are fixed to each other by clinch type caulking.   The joining flange portions to be superposed are fixed at a plurality of locations by clinch-type caulking at a predetermined interval along the longitudinal direction of the beam structure. Item 3. The beam structure according to any one of items 2 to 3.   The clinch-type caulking is formed relatively long along the longitudinal direction of the beam structure and short along a direction perpendicular to the web surface of each beam portion. 4. A beam structure according to any one of claims 2 and 3.   Each of the beam portions is formed of an aluminum extruded profile, and at least a cross section of a locking portion of the upper beam portion and a locking portion of the lower beam portion, and a bonding flange portion of the upper beam portion and the lower flange portion. The beam structure according to any one of claims 1, 2, 3, and 4, wherein the shape is the same.   An oxide film is formed on each of the beam portions at a stage before joining, according to any one of claims 1, 2, 3, 4, and 5. The beam structure described.   The web forming portion forming each beam portion is composed of two web forming portions having a hollow portion formed therebetween, claim 1, claim 2, claim 3, claim 4, claim 5 or claim 6. The beam structure according to any one of the above.   At least the joint flange portion also serves as a horizontal stiffener for the beam structure, wherein the joint flange portion serves as a horizontal stiffener of the beam structure. Item 8. The beam structure according to any one of items 7 to 9.

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