JP2001081723A - Deck - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a deck reliable in strength and capable of facilitating welding by the friction agitation welding method when connecting hollow extruded structural angles by means of welding and preventing the welded part from being largely deformed or preventing occurrence of a defected part to prevent the strength of the welded part from deteriorating and improving a lightweihgt property and workability. SOLUTION: A plurality of hollow extruded structural angles 2 made of aluminum alloy are lengthwise and crosswise welded to form a deck panel 1. In this case, flanges 2a are integrally formed along the longitudinal direction at the both sides of the upper face of the hollow extruded structural angle 2 and the front end edges of the flanges 2a of the mutually adjoining hollow extruded structural angle 2 are abutted against each other along the longitudinal direction and the abutted parts are continuously connected by the friction agitation welding to form the deck panel 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deck used for a slab such as a bridge such as a road bridge or a pedestrian bridge, or artificial ground.

[0002]

2. Description of the Related Art In a bridge, for example, a pier is erected on a foundation constructed underground as a substructure, a bridge girder is provided as an upper structure on the pier, and a floor slab is provided on the bridge girder. Conventionally, there are various types of floor slabs, and the most common concrete slabs have a gibber attached to a main girder, etc.
This is buried in the concrete slab cast at the site and the slab is joined to the main girder.

In addition, a metal slab is formed by welding a steel slab to a main girder or a floor slab by welding at a site, and a PC slab is provided with a stud dowel attached to a main girder or the like in a hole provided in the PC slab in advance. The PC slab is joined to the main girder by inserting and filling this hole with concrete.

[0004] However, since the concrete slab is constructed on site, concrete is poured into the slab.
Not only is it necessary to temporarily set up the scaffolds necessary for curing, but also to form a formwork, and it is not possible to proceed to the next operation until the concrete has solidified, so that building the floor slab requires time and effort.

[0005] Steel slabs and PC slabs have a large weight and require time and labor for on-site work such as welding work and concrete filling work, and workability is poor. In particular, fillet welds on orthotropic decks of steel cause fatigue failure. Also, the lack of flexibility in the lateral direction, ie, in the direction perpendicular to the direction of the main traffic flow, leads to a loss of the coating surface, which is expensive. Further, the reinforcing steel material inside the steel slab, the concrete slab, and the PC slab is easily rusted, and thus requires expensive corrosion resistance treatment, inspection, or paint treatment.

Therefore, it is lightweight, has corrosion resistance even without a protective coating, is easy to handle, can be manufactured to satisfy strict standards, is reliable in terms of strength, and has few welding points. As a floor slab that has bidirectional rigidity, is resistant to peeling of the coating layer, has strong adhesive strength of the coating layer, can use recycled materials, and can be manufactured at low cost overall, for example, the United States Patent No.5651
No. 154 is made of aluminum.

As shown in FIGS. 11 and 12, this is a hollow extruded member made of an aluminum alloy, and is an element 21 of a deck panel.
And the element 21 is joined in the longitudinal direction and the lateral direction to form the deck panel 1.
Has excellent resistance to chlorides and other corrosive chemicals without the need for common coatings,
For example, using aluminum alloy 6063-T6 or another similar alloy as the material, the shape is as shown in FIG. 12, and the upper flange 22, the lower flange 23 opposed in parallel thereto, and the space between the upper flange 22 and the lower flange 23 are formed. , And a truss-shaped triangular space 26 is formed in a direction orthogonal to the length direction of the elongated element 21.

The elements 21 having such a shape are juxtaposed in the lateral direction, and the ends of the upper flanges 22 of the adjacent elements 21 abut each other along the length direction. And butted portions are welded and joined. Such welding work is performed using a welding device installed in a factory.

The elements 21 adjoining in the lateral direction are joined by the one-side full penetration welds 27, 28 formed at the factory in this way to form the deck panel 1. The deck panel 1 has an oblique web 25 And the lower flange 23 form a relatively large cavity 29 of substantially triangular cross section between adjacent elements 21 and are integrally welded to the element 21.
The upper and lower flanges 22, 23 of the vehicle can function smoothly and provide substantial stiffness to the deck to withstand bending both parallel and perpendicular to the direction of traffic.

[0010]

Conventionally, in the case where hollow extruded profiles are generally joined by welding, fusion welding such as arc welding is applied as a welding method. The upper flanges 22 and the lower flanges 23 are joined by one-side complete penetration welding. In the case of fusion welding, since the load on the welding material is hardly applied, the welded structure has a light weight structure.However, there is a risk that the strength of the welded joint will decrease due to large deformation after joining and many defects at the joint. There is a problem that there is.

In order to solve such a disadvantage, a friction stir welding (FSW) method is considered. For example, a tool made of a material substantially harder than a workpiece is inserted into a weld of the workpiece. A welding method in which welding is performed in the direction of the welding line by moving the inserted tool while rotating it, that is, friction welding using plastic flow caused by frictional heat generated between the rotating tool and the workpiece. It is.

According to the friction stir welding method, since the welding can be performed while rotating the tool while the welding member is fixed, the joining can be performed even if the member is substantially infinitely long in the welding direction. Continuous solid-phase bonding is possible. The solid-state welding utilizing the plastic flow of the metal due to the frictional heat between the rotating tool and the welding member has the characteristic that it can be joined without melting the joints. It is considered to be suitable for joining extruded members because there are advantages such as a small number of defects and a small number of defects because the joint is not melted.

However, in this friction stir welding method, a tool is inserted into a welded portion of an extruded member as a fixed welding member only from above. For this reason, if there are welds on both the upper surface and the lower surface of the hollow extruded profile forming the deck panel, for example, if this portion is welded first with the upper surface joint on top, then It is necessary to turn the hollow extruded profile upside down and turn the bottom side up, and then weld the joint on the lower surface side in this state. There was nothing.

Further, in a deck panel having a top plate and a bottom plate from the beginning, when a stiffener is to be disposed in a space between the both plates, at least one side plate is cut off, It is necessary to arrange a stiffener as a rib in the space between the face plates through this notch, and then it is necessary to restore the notch part of the face plate, not only the workability is not good, but also
There is a possibility that notch portions, restoration portions, and the like are formed in the deck panel, and strength is also reduced.

An object of the present invention is to eliminate the disadvantages of the prior art, and to facilitate the use of friction stir welding as a welding method when joining hollow extruded profiles by welding, thereby greatly deforming the welded joint. Also, by preventing the occurrence of defects in the joint, preventing the decrease in the strength of the weld joint, it is reliable in terms of strength, and when using the friction stir welding method, the workability does not decrease, and An object of the present invention is to provide a deck that can be reduced in weight and improved in workability.

[0016]

In order to achieve the above object, the present invention firstly provides a deck for forming a deck panel by welding a plurality of aluminum alloy hollow extruded members in the width direction. A flange is integrally provided along the longitudinal direction on both sides of the upper surface of the profile, and the leading edges of the flanges of the adjacent hollow extruded profiles are abutted along the longitudinal direction, and the abutted portions are continuously welded by a friction stir welding method. And forming a deck panel.

Secondly, side T-shaped members as stiffeners are welded at appropriate intervals in a space formed below the joint of the flanges of the adjacent hollow extruded members. The gist of the present invention is to fix a T-shaped member to a deck panel support such as a beam or a girder.

Third, the side T-profile extends the lower part,
The gist of the present invention is to interconnect the lower extension portions of those to be welded to adjacent cavities.

Fourthly, side T-shaped members as stiffeners are welded to hollow spaces formed below the joints of the flanges of adjacent hollow extruded members at appropriate intervals, and the hollow members are hollowed out. The gist of the present invention is to integrally form an inverted T-shaped beam from the lower surface of the extruded profile along the longitudinal direction and to fix a flange of the inverted T-shaped beam to a lower girder.

Fifthly, side T-shaped members as stiffeners are welded to a space formed below the joint of the flanges of adjacent hollow extruded members at appropriate intervals. The gist is that an H-shaped beam is joined to the lower part of the side T-shaped member along the longitudinal direction of the hollow extruded shape by welding by friction stir welding, and the lower flange of the H-shaped beam is fixed to a lower girder. Is what you do.

Sixth, the hollow extruded profile comprises an upper plate having flanges protruding on both sides along the longitudinal direction, a lower plate parallel to the upper plate and narrower than the upper plate, A hollow portion is formed in an inverted trapezoidal shape in cross section by forming a diagonal side plate connecting the face plate and the hollow portion formed below the joint portion of the flange of the adjacent hollow extruded profile is formed in a trapezoidal cross section. The gist is that.

According to the first aspect of the present invention, the leading edges of the flanges protruding along the longitudinal direction of the upper surface of the hollow extruded profile are abutted along the longitudinal direction, and the abutting portions are continuously joined. Joining by the friction stir welding method can also be easily performed. And, since the joints are joined by welding by the friction stir welding method, the welded portions are not greatly deformed and the joints are not defective, preventing a decrease in the strength of the welded joints and obtaining a deck panel that is reliable in strength. Can be
And since this deck panel is made of aluminum alloy, it is lightweight, has corrosion resistance even without protective coating, is convenient to handle, and can be manufactured to meet the strict standards. The performance can be improved.

According to the second aspect of the present invention, in addition to the above-mentioned functions, side T-shaped members are formed at appropriate intervals in a space formed below the joint of the flanges of the adjacent hollow extruded members. By arranging and welding, reinforcement can be achieved, and at the same time, by fixing the side T-shaped member to a deck panel support such as a beam or a girder, the side T-shaped member can be used as a joint. Since the side T-shaped member serving as a joint is provided only at the fixing point, the weight can be further reduced.

According to the third aspect of the present invention, in addition to the above-described functions, the extension is provided at the lower portion of the side T-shaped member, so that the height of the extension is appropriately set so as to be optimal. A water gradient is obtained.

According to the fourth aspect of the present invention, in addition to the above function, an inverted T-shaped beam is integrally formed along the longitudinal direction from the lower surface of the hollow extruded profile, and the inverted T-shaped beam is formed. By fixing the flange to the lower girder, there is no need to separately provide a beam for fixing the deck panel to the girder, and there is no need to drill bolt holes for fixing the side T-shaped members. Can increase the strength.

According to the fifth aspect of the present invention, in addition to the above operation, an H-shaped beam is joined to the lower portion of the side T-shaped profile along the longitudinal direction of the hollow extruded profile by welding by friction stir welding. H-shaped beam can be welded in the same direction as when welding the flange on the upper surface side, so that the upper and lower two parts can be welded in the same state without inverting the hollow extruded profile, improving workability. I do. Further, since the lower flange of the H-shaped beam is fixed to the lower girder, it is not necessary to form a bolt hole for fixing the side T-shaped member or the like, and the strength of the deck panel can be improved.

According to the sixth aspect of the present invention, in addition to the above-mentioned functions, the hollow extruded profile has a hollow portion formed in an inverted trapezoidal cross section, and a flange is formed when adjacent hollow extruded profiles are joined. Since the space formed below the joint has a trapezoidal cross section, the same strength as that of the truss structure can be secured.

[0028]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows the first deck of the present invention.
FIG. 2 is a partially cutaway perspective view showing the embodiment, FIG. 2 is a vertical front view of the same, and FIG. 3 is a vertical side view of the same.
In the same manner as in the conventional example shown in FIG. 1, a hollow extruded shape member 2 of an aluminum alloy is used as an element, and a plurality of the members are welded in a longitudinal direction and a width direction to form a deck panel 1.
As an aluminum alloy, for example, heat-treated alloy type 6000
Use a 5000 series alloy.

The hollow extruded member 2 has an upper surface plate 2b having flanges 2a protruding on both sides along the longitudinal direction, a lower surface plate 2c parallel to the upper surface plate 2b and narrower than the upper surface plate 2b, Diagonal side plate 2d connecting face plate 2b and lower plate 2c
And the hollow portion 2e was formed in an inverted trapezoidal cross section.

In the figure, reference numeral 3 denotes a side T-shaped member which becomes a stiffener and a joint which is attached to a space 4 formed below the flange 2a when the hollow extruded members 2 are joined in the lateral direction as described later. It is formed by a front trapezoidal main body 3a and a lower flange 3b arranged in the space 4 shown in FIG.

Next, a method of manufacturing the deck panel 1 from the hollow extruded profile 2 and the side T-shaped profile 3 will be described. The hollow extruded profile 2 is joined in the longitudinal direction and the lateral direction. The lateral joining is performed by joining a flange 2a protruding along both sides of the upper surface of the hollow extruded profile 2 along the longitudinal direction. The materials 2 are butted in the longitudinal direction, and the butted portions are continuously joined by welding by friction stir welding (FSW) to form the deck panel 1.

In the friction stir welding method, for example, as shown in FIG. 2, a tool 6 made of a material which is substantially harder than a workpiece (hollow extruded section 2 in this embodiment) is inserted into a welded portion 5 of the workpiece. Then, welding is performed in the welding line direction by moving the inserted tool 6 while rotating it, that is, friction is generated by utilizing plastic flow due to frictional heat generated between the rotating tool 6 and the workpiece. It is to be welded.

In this friction stir welding method, the welding can be performed while rotating the tool 6 while the welding member is fixed, so that the solid-phase welding is continuously performed in the longitudinal direction with respect to the welding direction. It is possible. The solid-state welding utilizing the plastic flow of the metal due to the frictional heat between the rotating tool 6 and the welding member has a feature that the joining can be performed without melting the joining portion. It is considered to be suitable for joining extruded members because there are advantages such as a small number of defects and a small number of defects because the joint is not melted.

The tool 6 is inserted downward from above, and when welding the flange 2a of the hollow extruded profile 2, the flange 2a is turned downward. In this way, a suitable number of hollow extruded members 2 are joined laterally in a factory or the like to form a transportable unit.

A plurality of side T-shaped members 3 serving as stiffeners and joints are arranged at appropriate intervals, for example, at intervals of 2 to 3 m, in trapezoidal cavities 4 formed below the joined flanges 2a. The upper and side portions of the body 3a are MIG or T
Lower surface of flange 2a and side plate 2d by IG welding
Join outside. Thereby, the side T-shaped member 3 is arranged in a direction orthogonal to the hollow extruded member 2.

In the first embodiment, the hollow extruded profile 2 is arranged in a direction perpendicular to the bridge axis. The lower plate 2c of the hollow extruded profile 2 and the lower flange 3b of the side T-profile 3 are provided. Is disposed on the upper flange 7a of the beam 7 made of H-shaped steel, which is a support part of the deck panel 1, and the side T-shaped member 3
Of the beam 7 and the upper flange 7a of the beam 7 are fixed by bolts 8. As a result, the deck panel 1 in which the hollow extruded members 2 are arranged in parallel in a direction perpendicular to the beam 7 as the bridge axis is provided.

The second embodiment shown in FIGS. 4 to 6 is similar to the first embodiment in that the hollow extruded profile 2 is arranged in a direction orthogonal to the bridge axis. Since this embodiment is the same as the embodiment, a detailed description thereof will be omitted. In the second embodiment, when the hollow extruded section 2 is joined in the lateral direction, the shape of the side T-shaped section 3 serving as a stiffener / joint to be attached to a space 4 formed below the flange 2a is as follows.
The lower portion of the main body 3a to be welded to the cavity 4 is extended, and the lower extension portions 3c of those to be welded to the adjacent cavity 4 are connected to each other, so that the overall shape is formed in a substantially comb-teeth shape. .

A method of manufacturing the deck panel 1 from the hollow extruded profile 2 and the side T-shaped profile 3 will be described. The hollow extruded profile 2 is joined in the longitudinal direction and the lateral direction, and the joining in the lateral direction is performed in the same manner as in the first embodiment.
2 protruding along the longitudinal direction on both sides of the upper surface of the
The adjacent hollow extruded members 2 are butted along the longitudinal direction, and the butted portions are continuously joined by welding by a friction stir welding method to form the deck panel 1.

Then, side T-shaped members 3 serving as stiffeners and joints are arranged at appropriate intervals in a space 4 formed below the joined flange 2a, and the upper and side portions of the main body 3a are MIG or TIG. The lower surface of the flange 2a and the outside of the side plate 2d of the hollow extruded profile 2 and the upper portion of the extension 3c were welded to the lower surface of the lower plate 2c of the hollow extruded profile 2 by welding.

Next, the lower flange 3b of the side T-shaped member 3 is arranged on the upper flange 7a of the beam 7 made of H-shaped steel, which is a support portion of the deck panel 1, and the lower flange 3b of the side T-shaped member 3 The upper flange 7a of the beam 7 is fastened and fixed with bolts 8. The beam 7 which is the bridge axis
A deck panel 1 in which hollow extruded members 2 are arranged side by side in a direction perpendicular to the direction is provided.

In this case, by appropriately setting the height of the extension 3c of the side T-shaped member 3, a gradient can be provided on the deck panel 1, and a water gradient for drainage can be obtained.

FIGS. 7 and 8 show a third embodiment in which the hollow extruded profile 2 is arranged in a direction parallel to the bridge axis. The basic structure of the hollow extruded profile 2 is the first and second embodiments. In the third embodiment, in addition to the above-described structure, an inverted T-shaped beam 9 is integrally formed along the longitudinal direction from the lower surface of the lower surface plate 2c of the hollow extruded profile 2, and the beam 9 is formed. The lower flange 9a of the upper part of the girder by the lower H-section steel 10
Fix to 10a with bolts 8.

A structure in which a plurality of hollow extruded sections 2 are joined in a lateral direction by welding by friction stir welding, side T-shaped sections 3
Is joined to the space 4 by welding by the MIG or TIG welding method, which is the same as in the first and second embodiments.

Thus, in the third embodiment, the hollow extruded members 2 are arranged in the same direction parallel to the girder as the bridge shaft, that is, the H-section steel 10. In this case, the member functioning as a beam is an inverted T-shaped beam 9 as the hollow extruded member 2.
Since it is formed integrally with the lower part, it is not necessary to separately connect the beam to the hollow extruded shape member 2 and, therefore, it is not necessary to form a bolt hole for connection, so that greater strength can be secured. become.

FIGS. 9 and 10 show a fourth embodiment, which is the same as the third embodiment, except that the hollow extruded section 2 is parallel to the bridge axis.
Is arranged, the basic structure of the hollow extruded profile 2 is the same as that of the first, second, and third embodiments, but the structure of the side T-shaped profile 3 is the same as the first, second, and second embodiments. Unlike the third embodiment, it is formed as a single plate without the lower flange 3b.

Then, to manufacture the deck panel 1,
In the same manner as in the first embodiment, the hollow extruded profile 2 is joined by welding by a friction stir welding method in the lateral direction, and further, the side T-shaped profile 3 is formed in a space 4 formed below the flange 2a by this joining. Are joined by MIG or TIG welding, and an H-shaped beam 11 is joined to the lower surface of the side T-shaped member 3 along the longitudinal direction of the hollow extruded member 2 by welding by friction stir welding.

This joining is performed by the upper flange of the H-shaped beam 11.
Extruded hollow material 2 along the longitudinal edges of both ends of 11a
Is welded to the corner between the side plate 2d and the lower plate 2c of the H-shaped beam 11 so that the upper flange 11a of the H-shaped beam 11 closes the lower part of the cavity 4 so that the H-shaped beam 11 is in the same direction as the hollow extruded member 2. Joined to. Since the H-shaped beam 11 can be welded from the same direction as when the hollow extruded profile 2 is welded in the lateral direction, the work can be performed as it is without inverting the hollow extruded profile 2, thereby improving workability. Good.

Next, the lower flange 11b of the H-shaped beam 11 is fixed to the upper flange 10a of the lower girder made of the H-beam 10 with bolts 8. Thus, in the fourth embodiment, the hollow extruded members 2 are arranged in the same direction parallel to the girder as the bridge shaft, that is, the H-section steel 10. In this case, since the H-shaped beam 11 is joined to the lower portion of the hollow extruded shape 2 by welding by a friction stir welding method, a bolt hole for connecting the H-shaped beam 11 to the hollow extruded shape 2 is formed. There is no need, and greater strength can be secured.

[0049]

As described above, in the deck according to the present invention, the leading edges of the flanges protruding along the longitudinal direction of the upper surface of the hollow extruded profile are abutted along the longitudinal direction, and the butted portions are continuously joined. Therefore, even when the friction stir welding method is adopted as the joining method, the joining can be easily performed. And since it joins by welding by the friction stir welding method, the welded portion is not largely deformed and the joint does not have a defect, and the strength of the welded joint is prevented from being reduced, and a deck panel which is reliable in strength can be obtained. .

Furthermore, since this deck panel is made of aluminum alloy, it is lightweight, has corrosion resistance even without a protective coating, is easy to handle, and can be manufactured to meet strict standards. Yes, the workability can be improved.

Further, since the side T-shaped members are welded by arranging them at appropriate intervals in the space formed below the joint of the flanges of the hollow extruded members, reinforcement can be achieved, and at the same time, the lower beam can be formed. Since the side T-shaped members serving as joints are provided only at the fixing points to the beam and the girder, the weight can be further reduced.

Since an extension is provided below the side T-shaped member, an optimum water gradient can be obtained by appropriately setting the height of the extension.

Further, in a type in which an inverted T-shaped beam is integrally formed along the longitudinal direction from the lower surface of the hollow extruded profile,
There is no need to separately provide a beam for fixing the deck panel to the girder, and it is not necessary to form a bolt hole for fixing the side T-shaped member, so that the strength of the deck panel can be further increased.

Even when the H-shaped beam is joined to the lower part of the side T-shaped section along the longitudinal direction of the hollow extruded section by welding by the friction stir welding method to close the empty space, even when the flange on the upper side is welded. H-beam welding from the same direction
The upper and lower two portions can be welded in the same state without inverting the hollow extruded profile, thereby improving workability. Further, since the lower flange of the H-shaped beam is fixed to the lower girder, it is not necessary to form a bolt hole for fixing the side T-shaped member or the like, and the strength of the deck panel can be improved.

In the hollow extruded profile, the hollow portion is formed to have an inverted trapezoidal cross section, and when the adjacent hollow extruded profiles are joined, the space formed below the joining portion of the flange has a trapezoidal cross section. Therefore, the same strength as that of the truss structure can be secured.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing a first embodiment of a deck of the present invention.

FIG. 2 is a vertical sectional front view showing the first embodiment of the deck of the present invention.

FIG. 3 is a longitudinal sectional side view showing the first embodiment of the deck of the present invention.

FIG. 4 is a partially cutaway perspective view showing a second embodiment of the deck of the present invention.

FIG. 5 is a longitudinal sectional front view showing a second embodiment of the deck of the present invention.

FIG. 6 is a longitudinal sectional side view showing a second embodiment of the deck of the present invention.

FIG. 7 is a longitudinal sectional front view showing a third embodiment of the deck of the present invention.

FIG. 8 is a vertical sectional side view showing a third embodiment of the deck of the present invention.

FIG. 9 is a longitudinal sectional front view showing a fourth embodiment of the deck 4 of the present invention.

FIG. 10 is a vertical sectional side view showing a fourth embodiment of the deck of the present invention.

FIG. 11 is a partially cutaway plan view of a conventional deck.

FIG. 12 is a vertical sectional front view of a deck panel of a conventional deck.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Deck panel 2 ... Hollow extruded profile 2a ... Flange 2b ... Top plate 2c ... Lower plate 2d ... Side plate 2e ... Hollow part 3 ... Side T-shaped member 3a ... Main body 3b ... Lower flange 3c ... Extension part 4 ... Empty Place 5 ... Welded part 6 ... Tool 7 ... Beam 7a ... Upper flange 8 ... Bolt 9 ... Beam 9a ... Flange 10 ... H-shaped steel 10a ... Top flange 11 ... H-shaped beam 11a ... Top flange 11b ... Bottom flange 21 ... Element 22 ... upper flange 23 ... lower flange 24 ... vertical web 25 ... diagonal web 26 ... void 27 ... welded 28 ... welded 29 ... void

Continued on the front page (72) Inventor Kazushi Watanabe 5-11-3 Shimbashi, Minato-ku, Tokyo Sumitomo Light Metal Industries Co., Ltd. (72) Inventor Masaki Kumagai 5-11-3 Shimbashi, Minato-ku, Tokyo Sumitomo Light Metal Industry Co., Ltd. (72) Inventor Nao Tanaka 5-11-3 Shimbashi, Minato-ku, Tokyo Sumitomo Light Metal Industry Co., Ltd. F-term (reference) 2D059 AA13 GG01 GG55

Claims (6)

[Claims] 1. A deck in which a plurality of aluminum alloy hollow extruded sections are welded in the width direction to form a deck panel, flanges are integrally provided on both sides of an upper surface of the hollow extruded sections along a longitudinal direction, A deck panel characterized in that butting edges of the flanges of the hollow extruded profiles are abutted along a longitudinal direction, and the abutting portions are continuously joined by welding by a friction stir welding method to form a deck panel. 2. A side T-shaped member as a stiffener is welded to a space formed below a joint portion of a flange of an adjacent hollow extruded member at appropriate intervals. The deck according to claim 1, wherein the section is fixed to a deck panel support such as a beam or a girder. 3. The deck of claim 2, wherein the side T-profile extends the lower portion and interconnects the lower extensions of those welded to adjacent cavities. 4. A side T-shaped stiffener as a stiffening member is welded to a space formed below a joint portion of a flange of an adjacent hollow extruded shape at an appropriate interval, and is formed by hollow extrusion. The deck according to claim 1, wherein an inverted T-shaped beam is integrally formed along a longitudinal direction from a lower surface of the material, and a flange of the inverted T-shaped beam is fixed to a lower spar. 5. A side T-shaped member as a stiffening member is welded to an empty space formed below a joint portion of a flange of an adjacent hollow extruded member at an appropriate interval. 2. The deck according to claim 1, wherein an H-shaped beam is joined to a lower portion of the molded shape along a longitudinal direction of the hollow extruded shape by welding by friction stir welding, and a lower flange of the H-shaped beam is fixed to a lower girder. . 6. A hollow extruded profile comprises an upper plate having flanges protruding on both sides along a longitudinal direction, a lower plate parallel to the upper plate and narrower than the upper plate, and the upper plate and the lower plate. The hollow portion is formed to have an inverted trapezoidal cross section, and the cavity formed below the joint portion of the flange of the adjacent hollow extruded profile is formed to have a trapezoidal cross section. The deck according to any one of claims 1 to 5.