JP2006037577A - Complementary rigid beam and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an aluminum alloy complementary rigid beam to be manufactured with less weld lines for easier manufacturing work and lighter weight. <P>SOLUTION: The I-type complementary rigid beam 1 has web portions 4 arranged between an upper flange portion 2 and a lower flange portion 3. It comprises two T-type end members 6A, 6b each having the flange portion 2 and part of the web portion 4 integrally formed by the extrusion molding of an aluminum alloy and two intermediate members 7A, 7B arranged between both T-type end members and each having a horizontal complementary rigid material 5 integrally formed on one side face of the intermediate web portion 4 having a preset height by the extrusion molding of an aluminum alloy. Both web portions 4, 4 between each of the T-type end members 6A, 6b and each of the intermediate members 7A, 7B and both web members 4, 4 between the upper and lower adjacent intermediate members 7A, 7B are joined to each other using a friction stirring joint method. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a stiffening girder made of an aluminum alloy and a manufacturing method thereof.

  In general, girders such as steel bridges (so-called bridge girders) are manufactured by welding steel plates, and when they become large-scale like road bridges, their weight becomes very large and therefore their supporting structures and The installation work was inevitably large. In addition, steel materials need to be periodically coated for corrosion resistance, and the cost is high.

Recently, in order to reduce the weight, installation work, and painting maintenance, aluminum alloys are used in place of steel plates in pedestrian bridges.
As described above, when an attempt is made to produce a large girder such as a road bridge using an aluminum alloy, it can be considered to comply with a production method using a steel plate.

  For example, when manufacturing a tall I-shaped girder, as shown in FIG. 10, a web plate 53 is disposed between the upper and lower flange plates 51 and 52, and the connecting points are formed by fillet welding from both sides. Will be joined.

  In general, when a load is applied to a simply supported I-shaped girder, it is bent in the vertical direction and a bending moment is generated, so that a compressive force acts on the upper side of the web plate and a tensile force acts on the lower side. In addition, due to the shearing force, the entire web plate (in the center in the height direction and large near the fulcrum) has a compressive force (direction connecting the load point and the fulcrum) and a tensile force (load) The direction perpendicular to the direction connecting the point and the fulcrum) acts.

By the way, in the conventional stiffening girder, as shown in FIG. 11, the horizontal stiffening girder 54 is formed on the upper side of the web plate 53 by fillet welding in order to cope with buckling in the longitudinal direction of the web upper portion due to the bending moment. In addition, the web plate 53 between the horizontal stiffener 54 and the lower flange plate 52 has a wide non-reinforcing portion, which mainly copes with the shear buckling in the oblique direction of this portion. Therefore, the vertical stiffeners 55 are densely arranged at predetermined intervals by fillet welding (see, for example, Patent Document 1).
JP 2002-294628 A

  However, as mentioned above, when trying to manufacture an aluminum alloy product in accordance with a steel stiffening girder, in addition to the horizontal stiffeners, vertical stiffeners are also provided at predetermined intervals. The line becomes long. Therefore, when manufacturing a stiffening girder made of aluminum alloy, it is greatly affected by the welding heat, resulting in a large distortion and a very troublesome manufacturing work. The problem arises that the thickness increases and the weight increases.

  Therefore, in order to solve the above-described problems, the present invention provides a stiffening girder that can reduce the weight of the stiffening girder and reduce the weld line when manufacturing a stiffening girder made of aluminum alloy, and can reduce the weight. It aims at providing the production method.

In order to solve the above problems, the stiffening girder of the present invention is an I-type stiffening girder in which a web portion is disposed between an upper flange portion and a lower flange portion,
Two T-type end members in which a flange portion and a part of the web portion are integrally formed by extrusion molding of an aluminum alloy, and a predetermined height disposed between the two T-type end members and extrusion molding of the aluminum alloy. And a plurality of intermediate members integrally formed with a horizontal stiffener on at least one side surface of the intermediate web portion,
At least the web portions of the T-shaped end member and the intermediate member are joined using a friction stir welding method.

Another stiffening girder of the present invention is an I-type stiffening girder in which a web portion is disposed between an upper flange portion and a lower flange portion,
Two T-type end members in which a flange portion and a part of the web portion are integrally formed by extrusion molding of an aluminum alloy, and a predetermined height disposed between the two T-type end members and extrusion molding of the aluminum alloy. A plurality of intermediate members integrally formed with a horizontal stiffener on at least one side surface of the intermediate web portion,
The web portions of the T-shaped end member and the intermediate member and the web portions of the intermediate members adjacent to each other in the vertical direction are joined using a friction stir welding method.

The cross-sectional shapes of the plurality of intermediate members in each stiffening girder are the same.
Further, a plurality of stiffeners arranged on the side surface of the web portion in each stiffening girder are arranged at equal intervals between the upper flange portion and the lower flange portion.

Furthermore, the method for producing a stiffening girder according to the present invention is a method for producing an I-type stiffening girder in which a web portion is disposed between an upper flange portion and a lower flange portion,
Two T-type end members in which a flange portion and a part of the web portion are integrally formed by extrusion molding of an aluminum alloy, and a predetermined height disposed between the two T-type end members and extrusion molding of the aluminum alloy. A plurality of intermediate members in which a horizontal stiffener is integrally formed on at least one side surface of the intermediate web portion,
Next, at least the web portions of the T-shaped end member and the intermediate member are each joined using a friction stir welding method.

Another method for producing a stiffening girder of the present invention is a method for producing an I-type stiffening girder in which a web portion is disposed between an upper flange portion and a lower flange portion,
Two T-type end members in which a flange portion and a part of the web portion are integrally formed by extrusion molding of an aluminum alloy, and a predetermined height disposed between the two T-type end members and extrusion molding of the aluminum alloy. A plurality of intermediate members in which a horizontal stiffener is integrally formed on at least one side surface of the intermediate web portion,
Next, the web portions of the T-shaped end member and the intermediate member and the web portions of the intermediate member disposed above and below are joined using a friction stir welding method.

  According to each of the above configurations, when manufacturing a stiffening girder with an aluminum alloy, a T-shaped end member including a connection portion between the flange portion and the web portion, and an intermediate portion including a connection portion between the web portion and the horizontal stiffener. By producing the members by extrusion molding, for example, it is possible to eliminate heat input due to welding at the end members where the maximum compression force and maximum tensile force act, and to prevent the strength of the material from being lowered. Since it is not necessary to place the material biased to the side where the compressive force acts, that is, by arranging a plurality of horizontal stiffeners at equal intervals in the overall height of the stiffening girder, the stiffening girder is seated in an oblique direction. Because the resistance to bending increases (strength against shear and bending increases), it is usually possible to omit the required vertical stiffeners and avoid increasing the thickness to compensate for the strength reduction More it is possible to further facilitate and weight reduction of the fabrication.

[Embodiment]
Hereinafter, a stiffening girder according to an embodiment of the present invention and a manufacturing method thereof will be described with reference to the drawings.

  This stiffening girder is used, for example, as a bridge girder, and is provided with a plurality of horizontal stiffeners at predetermined intervals on the side of the web portion of a large I-shaped girder. In order to make it easier, it is made of an aluminum alloy.

  As shown in FIGS. 1 and 2, the configuration of the stiffening girder 1 will be described in detail. A web portion 4 is disposed between the upper flange portion 2 and the lower flange portion 3. A plurality of, for example, two horizontal stiffeners 5, for example, are provided on one side surface. Further, the positions of the horizontal stiffeners 5 disposed between the upper flange portion 2 and the lower flange portion 3 are disposed at equal intervals with respect to the height H between the both flange portions 2 and 3. . More specifically, the flange portions 2 and 3 and the horizontal stiffener 5 are equally spaced at the center of each thickness. In addition, the upper flange part 2, the lower flange part 3, and the horizontal stiffener 5 are formed in plate shape.

  When the stiffening girder 1 is manufactured, as shown in FIG. 3, two T-type end members 6 (6A, 6B) in which the upper flange portion 2 and a part of the web portion 4 are integrally formed are formed. Two intermediate members 7 (which are disposed between the upper and lower T-shaped end members 6A and 6B and are integrally formed with a horizontal stiffener 5 projecting from one side surface of the intermediate web portion 4 having a predetermined height h, respectively. 7A, 7B), and aluminum alloys are used as these materials.

  That is, the T-shaped end members 6A and 6B and the intermediate members 7A and 7B are manufactured by extrusion molding of aluminum, and two T-shaped end members 6A and 6B that are manufactured by the extrusion molding between the two upper and lower T-shaped end members 6A and 6B. The intermediate members 7A and 7B are arranged in the vertical position and parallel to the flange portions 2 and 3, and are joined to each other by the friction stir welding method. In the drawing, W indicates a joint portion by a friction stir welding method, and in order to clarify the joint portion, it is illustrated as bulging in a round shape, but in actuality, it is substantially the same as the thickness of the flange portion. Yes.

  By the way, this friction stir welding method is a method in which a hard round bar having a projection at the center is rotated to enter a joint, and the friction heat is applied to the joint member and stirred to join, and extra welding is performed. Thus, it is possible to prevent heat input and to supply shield gas at the time of welding and pre-treatment work, and therefore, it is a simple work and can reduce the occurrence of thermal distortion as much as possible.

Hereinafter, the manufacturing method of the said stiffening girder 1 is demonstrated more concretely based on FIG. In addition, about a member number, it attaches | subjects and demonstrates.
First, a horizontal stiffener 15 is integrally projected on one side surface of a T-shaped end member 13 in which a part of the web portion 12 is integrally provided on the flange portion 11 and an intermediate web portion 14 having a predetermined height h. Two intermediate members 16 are produced by extrusion molding of aluminum.

  Next, the lower end edge of the web portion 12 of the upper T-shaped end member 13 (13A), the upper end edge of the intermediate web portion 14 of the upper intermediate member 16 (16A), and the lower T-shaped end member 13 ( 13B) and the lower end edge of the intermediate web portion 14 of the lower intermediate member 16 (16B) are joined to each other by a friction stir welding method.

  Next, the lower end edge of the intermediate web portion 14 of the upper intermediate member 16 (16A) and the upper end edge of the intermediate web portion 14 of the lower intermediate member 16 (16B) are also joined by the friction stir welding method.

  By this joining operation, a stiffening girder made of aluminum alloy can be easily manufactured with a very small joining line and a small amount of heat input as compared with the case of a conventional stiffening girder made of steel.

  In the above description, two horizontal stiffeners are arranged, but three or more may be arranged. Of course, in this case, three or more intermediate members having a horizontal stiffener protruding from one side surface of the intermediate web portion are manufactured.

  In the above description, after joining the T-shaped end member and the intermediate member, the intermediate members adjacent to each other in the upper and lower sides are joined. However, the intermediate members are joined first, and then these are joined. The T-shaped end members may be joined to the upper and lower sides of the intermediate member.

  As described above, a large stiffening girder is made of a lightweight aluminum alloy, and in its manufacture, a T-type end member in which a connection portion between a flange portion and a web portion manufactured by extrusion molding is integrated; Also, since the web part manufactured by extrusion molding and the intermediate member in which the connection part of the horizontal stiffener is integrated are joined via the opposing edges of each web part, the joining line is reduced. In addition, since the friction stir welding method is used for the joining, the amount of heat generated at the joint is reduced, and the occurrence of thermal strain can be suppressed as much as possible to prevent the strength from being lowered. It becomes advantageous, and the increase in the thickness with respect to the strength reduction can be suppressed.

  That is, when manufacturing a stiffening girder with an aluminum alloy, a T-shaped end member including a connection portion between the flange portion and the web portion and an intermediate member including a connection portion between the web portion and the horizontal stiffener are respectively extruded. By manufacturing by molding, for example, heat input due to welding at the end member where the maximum compressive force and maximum tensile force act can be eliminated, and the strength of the material can be prevented from being lowered. Since there is no need to be biased to the side to be arranged, a plurality of horizontal stiffeners can be arranged at equal intervals at the overall height of the stiffening girder (for example, the height between the centers of the upper and lower flange portions or the overall height of the web portion). In addition, by arranging the horizontal stiffeners at even intervals, the resistance to buckling (shear buckling) in the diagonal direction of the stiffening girder increases, so that the normal vertical stiffening is usually required. Material It can be omitted (or only horizontal stiffeners), it is possible to more facilitate and weight reduction of further fabrication.

Here, the effect obtained by the stiffening girder according to the present invention and the manufacturing method thereof will be described in detail.
As described above, in the conventional stiffening girder, the vertical stiffener is provided to increase the resistance to shear buckling. However, the stiffening girder according to the present invention is not a vertical stiffener but a horizontal stiffener. A rigid material is also arranged on the lower side of the web portion to make up a plurality of horizontal stiffeners. That is, the shearing force acts on each part of the web portion in the horizontal and vertical directions, and mechanically, the shearing force resists in the vertical direction in the conventional stiffening girder. In contrast, the stiffening girder of the present invention resists in the horizontal direction.

  When the load becomes excessive and shear buckling occurs, the conventional stiffening girder is divided into a horizontal stiffening girder 54 and a vertical stiffening girder 55 as shown in FIGS. 5 (c) and 5 (d). In each portion of the web portion formed, oblique shear buckling waveforms S2 and S3 appear. On the other hand, as shown in FIGS. 5 (a) and 5 (b), the shear buckling waveform S1 that appears in the stiffening girder of the present invention is narrow in the interval between the horizontal stiffeners 5 and 5, so Compared to the buckling waveform, particularly the shear buckling waveform S3 appearing at the bottom of the web plate, the wavelength is small. In addition, (a) and (c) of FIG. 5 is a front view of a stiffening girder, and (b) and (d) are side views.

  In general, rods and flat plates are likely to buckle with a waveform with a large wavelength (a waveform with a small number of waves). This indicates that the strength is higher.

  Further, according to the configuration of the present invention, arranging a plurality of horizontal stiffeners at equal intervals or at equal intervals also increases the cross-sectional secondary moment, which is the degree of resistance to the bending moment, that is, bending It is also effective against buckling due to moment.

  Moreover, when manufacturing a stiffening girder with an aluminum alloy as in the configuration of the present invention, a T-shaped end member including a connecting portion between the flange portion and the web portion, and a connecting portion between the web portion and the horizontal stiffener Can be produced by extrusion molding, for example, to eliminate heat input due to welding at the end member on which the maximum compressive force and maximum tensile force act, for example, to prevent member distortion and material strength reduction. Further, by using a friction stir welding method for joining the end member and the intermediate member, heat input due to welding can be eliminated, and distortion of the entire girder and strength reduction of the joint can be prevented.

  That is, the strength against shearing and bending can be increased, and by using extrusion molding (extruded material) and the friction stir welding method, it is possible to avoid an increase in the plate thickness to compensate for the strength reduction. Compared with the stiffening girders, the thickness of the material can be reduced, and the overall weight can be reduced.

  In the manufacture of stiffening girders according to the conventional example, the flange plate and web plate, the vertical stiffener and the horizontal stiffener divided into the vertical stiffeners are joined by fillet welding, respectively. Therefore, it takes time for the welding work.

  On the other hand, according to the method for manufacturing a stiffening girder of the present invention, basically, the extrusion material is manufactured and bonded using the friction stir welding method only in the longitudinal direction of the extruded material. The stiffener is also omitted, and it is possible to further facilitate the production.

  By the way, in the said embodiment, although demonstrated as what joined the T-shaped end member and the two intermediate members provided with the horizontal stiffener, for example, as shown in FIG. The intermediate members 7 of the coupling members 8 and 8 formed by joining the intermediate members 7 to each other by the friction stir welding method W are connected to each other with bolts and nuts (rivets or MIG welding, for example) via a rectangular accessory plate 21. It may be joined by welding. The stiffening girder according to this configuration can be manufactured by joining on-site because the stiffening girder needs to be divided and transported when the stiffening girder is enlarged.

  In the above embodiment, the horizontal stiffener is provided only on one side of the web portion. However, as shown in FIG. 7, for example, the horizontal stiffener 5 is provided on both sides of the web portion 4. You may project.

  In the above embodiment, the horizontal stiffener 5 has been described as a plate. However, as shown in FIG. 8, for example, the horizontal stiffener 5 'has an L-shaped (key-shaped) cross section. Alternatively, as shown in FIG. 9, the cross section may be a horizontal stiffener 5 ″ in which a hollow portion is formed in a square shape.

It is a front view of the stiffening girder concerning an embodiment of the invention. It is a side view of the stiffening girder. It is a perspective view of the stiffening girder. It is a disassembled perspective view explaining the manufacture procedure of the stiffening girder. It is a figure which shows the comparison of the shear buckling waveform in the stiffening girder of this invention, and the stiffening girder of a prior art example, (a) is a front view of this invention, (b) is a side view of this invention, (c) is conventional. An example front view and (d) are side views of a conventional example. It is a front view which shows the modification of the stiffening girder. It is a front view which shows the modification of the stiffening girder. It is a front view of the stiffening girder concerning other embodiments of the present invention. It is a front view of the stiffening girder concerning other embodiments of the present invention. It is a front view of the I type girder for demonstrating a prior art example. It is a perspective view of the stiffening girder concerning a conventional example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Stiffening girder 2 Upper flange part 3 Lower flange part 4 Web part 5 Horizontal stiffener 5 'Horizontal stiffener 5 "Horizontal stiffener 6 T type end member 7 Intermediate member

Claims (6)

An I-type stiffening girder having a web portion disposed between an upper flange portion and a lower flange portion,
Two T-type end members in which a flange portion and a part of the web portion are integrally formed by extrusion molding of an aluminum alloy, and a predetermined height disposed between the two T-type end members and extrusion molding of the aluminum alloy. And a plurality of intermediate members integrally formed with a horizontal stiffener on at least one side surface of the intermediate web portion,
A stiffening girder characterized in that at least the web portions of the T-shaped end member and the intermediate member are joined together using a friction stir welding method. An I-type stiffening girder having a web portion disposed between an upper flange portion and a lower flange portion,
Two T-type end members in which a flange portion and a part of the web portion are integrally formed by extrusion molding of an aluminum alloy, and a predetermined height disposed between the two T-type end members and extrusion molding of the aluminum alloy. And a plurality of intermediate members integrally formed with a horizontal stiffener on at least one side surface of the intermediate web portion,
A stiffening girder formed by joining the web portions of the T-shaped end member and the intermediate member and the web portions of the intermediate members adjacent to each other using a friction stir welding method.   The stiffening girder according to claim 1 or 2, wherein a plurality of intermediate members have the same cross-sectional shape.   4. The plurality of stiffeners disposed on the side surface of the web portion are disposed at equal intervals between the upper flange portion and the lower flange portion. 5. Stiffening girder. A method of manufacturing an I-type stiffening girder in which a web portion is disposed between an upper flange portion and a lower flange portion,
Two T-type end members in which a flange portion and a part of the web portion are integrally formed by extrusion molding of an aluminum alloy, and a predetermined height disposed between the two T-type end members and extrusion molding of the aluminum alloy. A plurality of intermediate members in which a horizontal stiffener is integrally formed on at least one side surface of the intermediate web portion,
Next, at least the web portions of the T-shaped end member and the intermediate member are joined using a friction stir welding method, respectively. A method of manufacturing an I-type stiffening girder in which a web portion is disposed between an upper flange portion and a lower flange portion,
Two T-type end members in which a flange portion and a part of the web portion are integrally formed by extrusion molding of an aluminum alloy, and a predetermined height disposed between the two T-type end members and extrusion molding of the aluminum alloy. A plurality of intermediate members in which a horizontal stiffener is integrally formed on at least one side surface of the intermediate web portion,
Next, a method for producing a stiffening girder characterized in that the web portions of the T-shaped end member and the intermediate member and the web portions of the intermediate member arranged above and below are joined using a friction stir welding method.

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