KR20230022617A - Aluminum bonded structure flatbed trailer - Google Patents

Abstract

The present invention provides an aluminum-coupled flatbed trailer comprising: a plurality of main beams made of aluminum; a plurality of cross members made of aluminum and connected and arranged at predetermined intervals in the longitudinal direction of the main beams; floors made of aluminum and arranged on both sides of each of the main beams in parallel with the longitudinal direction of the main beam; and side members made of aluminum and coupled to both longitudinal ends of the main beam, both longitudinal ends of the floor, and sides of the floor arranged on outermost sides thereof. The main beam includes a top flange, a web, and a bottom flange. The floor includes a center floor and side floors. The top flange of the main beam, the center floor and the side floors of the floor, and the side members have the shape of a square pipe having a reinforcing material of a corrugated cross section provided on an inner side thereof. A first coupling groove is formed on one side of the top flange facing the center floor. Both sides of the center floor have first coupling protrusions formed thereon to be inserted to the first coupling grooves. Second coupling grooves are formed on sides of the side floors. The other side of the top flange has second coupling protrusions formed thereon to be inserted into the second coupling grooves. An upper side of the other side of each of the side floors has a first protruding plate protruding in the direction of the side member. An upper side of the side member has a first connection groove formed thereon to insert the first protruding plate. One side of the side member has a second protruding plate formed thereon to support the side floor. Therefore, the aluminum-coupled flatbed trailer can provide structural strength to stably load cargo.

Description

Aluminum bonded structure flatbed trailer

The present invention relates to a flatbed trailer with an aluminum combination structure connected to a vehicle and supporting cargo in a loaded state.

In general, trailers are divided into coil trailers capable of loading coils and flatbed trailers capable of loading containers and ordinary cargoes, which are roughly classified according to the type of load.

For example, flatbed trailers as shown in Figs. 1 and 2 are common, and the contents are as follows.

A conventional flatbed trailer (PT) includes a main frame (MF) composed of a master beam (MB), a cross member (CM), a side member (SM), and a floor (FR). The master beam (MB) has a top and a bottom flange (TF) (BF) arranged on the upper and lower sides so that its cross section is formed in the shape of a known "H" beam, and the top and bottom flange (TF) (BF) It is a structure in which the upper and lower ends of the cross-section of the web (WB) are welded to the middle portion of the cross-section.

A plurality of through-holes HL are formed on the upper side of the web WB of the master beam MB at equal intervals in the longitudinal direction, so that cross members CM, which will be described later, are penetrated and arranged to facilitate installation.

On the other hand, the cross member CM is a square pipe having a rectangular cross section, which is welded after passing through the through hole HL of the web WB to form a combined frame structure.

As described above, since all of the components constituting the main frame MF are made of steel, there is a problem in that the weight of the completed flatbed trailer PT is excessive and the loading weight is relatively small. In addition, since the above-described floor FR does not reinforce the strength of the main frame MF at all and only makes the weight of the trailer heavy, there is a problem in that it does not give users confidence.

In order to solve these problems, a flat trailer using an aluminum main frame has been attempted, but the reinforcing structure and connection structure of the top flange (TF) and floor (FR) of the master beam (MB) in the form of a square tube are not stable. There is a clear problem in the structural strength of the main frame. In addition, due to the coupling structure in which the top flange TF and the floor FR are disposed on the upper side of the cross member CM, there is a problem in that workability is poor during coupling installation.

Such a related technology for flatbed trailers is presented in Republic of Korea Utility Model Registration No. 20-0419268 (June 12, 2006).

An object of the present invention is to provide an aluminum combination structure flatbed trailer that can maximize load capacity by increasing strength and has excellent workability during combination installation.

The present invention provides a plurality of main beams made of aluminum that are spaced apart from each other in the longitudinal direction, a plurality of cross members made of aluminum that are connected and arranged at regular intervals in the longitudinal direction of the main beam, and main beams on both sides of the main beam. A flat trailer with an aluminum combination structure consisting of a floor made of aluminum that is arranged in parallel with the longitudinal direction of the main beam, and side members made of aluminum that are coupled to both ends of the longitudinal direction of the main beam and both ends of the longitudinal direction of the floor and to the outermost side of the floor. The main beam includes a top flange coupled to the floor on both sides, a web coupled to the bottom of the top flange, and a bottom flange coupled to the lower end of the web while facing the top flange, wherein the The floor includes a center floor disposed between the top flange of the main beam, a side floor disposed between the top flange of the main beam and a side member, and the top flange of the main beam, the center floor of the floor, the side floor, and the side floor. The member has a square tube shape with a reinforcing material having a corrugated cross-section on the inside, a first coupling groove is formed on one side of the top flange facing the center floor, and a first coupling groove is formed on both sides of the center floor facing the top flange. A first coupling protrusion inserted to correspond to is formed, a second coupling groove is formed on one side of the side floor facing the top flange, and a second coupling groove is formed on the other side of the top flange facing the side floor. A second coupling protrusion inserted correspondingly is formed, a first protrusion plate portion protruding in the direction of the side member is formed on the upper side of the other side surface of the side floor facing the side member, and the first protrusion plate portion is formed on the upper side of the side member. A flat trailer with an aluminum combination structure is provided, in which a first connecting groove portion to be inserted is formed, and a second protruding plate portion supporting the side floor is formed on one side of a surface of a side member facing the side floor.

In addition, a first insertion reinforcement part formed with a first insertion groove for coupling the upper end of the web in an inserted state is formed on the bottom surface of the top flange to which the upper end of the web is coupled, protruding downward, and the bottom to which the lower end of the web is coupled. On the upper surface of the flange, a second insertion reinforcement part having a second insertion groove for engaging the lower end of the web in an inserted state protrudes upward, and the inside of the bottom part of the top flange on which the first insertion reinforcement part is formed is formed on the side surface of the top flange. The top connection thickness reinforcing portion may be formed to be thicker than the portion or the upper surface portion.

In addition, a plurality of protruding protrusions spaced apart from each other by a predetermined interval may be further formed on the upper surface of the top flange and the upper surface of the floor.

In addition, wood insertion grooves may be further formed on the upper surfaces of the center floor and the upper surfaces of the side floors.

In addition, mounting brackets having mounting grooves may be provided on the bottom surface of the side floor and the bottom surface of the side member.

In the aluminum combination structure flatbed trailer according to the present invention, the main beam, cross member, floor, and side members are made of aluminum to reduce weight, and the top flange of the main beam, the center floor of the floor, the side floors, and the side members are formed on the inside. It is integrally molded in the form of a square tube with a corrugated cross-section stiffener, providing structural strength to stably load cargo. In addition, the top flange and the center floor are connected through the first coupling groove and the first coupling projection that correspond to each other, the side floor and the top flange are connected through the second coupling groove and the second coupling projection that correspond to each other, and the side floor The floor and the side member are bonded through the first protruding plate portion of the side member and the second protruding plate portion of the side member to have stable bonding strength.

1 and 2 are cross-sectional views showing a conventional flatbed trailer.
3 is a plan view of an aluminum combination structure flatbed trailer according to an embodiment of the present invention.
4 is a side view of a flatbed trailer with an aluminum bonding structure according to an embodiment of the present invention.
FIG. 5 is a cross-sectional view taken along line V-V shown in FIG. 3 .
FIG. 6 is a cross-sectional view taken along line VI-VI shown in FIG. 4 .
7 is an enlarged view of the top flange shown in FIG. 6;
FIG. 8 is an enlarged view of the center floor shown in FIG. 6 .
9 is an enlarged view of the side floor shown in FIG. 6;
10 is an enlarged view of the side member shown in FIG. 6;

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is a plan view of a flatbed trailer with an aluminum combination structure according to an embodiment of the present invention, FIG. 4 is a side view of the flatbed trailer with an aluminum combination structure according to an embodiment of the present invention, and FIG. 5 is V-V shown in FIG. It is a cross-sectional view taken along the line, and FIG. 6 is a cross-sectional view taken along the line VI-VI shown in FIG. 4 . Referring to FIGS. 3 to 6 , an aluminum combination structure flatbed trailer according to an embodiment includes a main beam 100 , a cross member 200 , a floor 300 , and a side member 400 . A towing means (not shown) fastened to the vehicle is provided at the front of the flat trailer, and a driving wheel means 10 equipped with a plurality of wheels is connected to the rear of the flat trailer to enable driving on the road. . In addition, the main beam 100, the cross member 200, the floor 300, and the side member 400 may be made of aluminum. Here, reference numeral 20 denotes an air tank portion, and reference numeral 30 denotes a light bracket enabling a light to be mounted.

The main beams 100 are arranged side by side and spaced apart from each other in the longitudinal direction of the flat trailer, and more specifically, are provided with a pair so as to be spaced apart from each other in the longitudinal direction. The main beam 100 includes a top flange 110, a web 120, and a bottom flange 130.

The top flange 110 is a part constituting the upper side of the main beam 100, and both sides of the top flange 110 in the width direction are coupled to the floor 300 in a connected state. Referring to FIG. 7 , the top flange 110 has a square tube shape having a rectangular structure with a space provided therein. In addition, a reinforcing material 110a for reinforcing the structural strength of the top flange 110 is formed inside the top flange 110. At this time, the reinforcing material 110a has a vertical cross-sectional shape of a wave with peaks and valleys, The peaks and valleys of 110a) are connected to the inside of the top surface and the inside of the bottom surface of the top flange 110. Here, the reinforcing member 110a may be integrally formed with the top flange 110 through extrusion.

Also, a first coupling groove 111 is formed on one side of the top flange 110, more specifically, on a surface facing the center floor 310 of the floor 300 to be described later. The first coupling groove 111 allows the first coupling protrusion 311 of the center floor 310 to be inserted and disposed correspondingly, increasing the contact area between the top flange 110 and the center floor 310. In addition, the bonding strength in the vertical direction is increased, and a stable bonding state is maintained when bonding is performed by welding or fastening means such as bolts or rivets.

In addition, the second coupling protrusion 112 is formed on the other side of the top flange 110, more specifically, on the side facing the side floor 320 of the floor 300. The second coupling protrusion 112 is inserted to correspond to the second coupling groove 321 of the side floor 320, thereby increasing the contact area between the top flange 110 and the side floor 320. Increases the bonding strength in the vertical direction, and maintains a stable combined state when combined by welding or fastening means such as bolts or rivets.

In addition, a first insertion reinforcement part 113 is formed to protrude downward at one side of the bottom surface of the top flange 110, more specifically, at a portion where the upper end of the web 120 is coupled. A first insertion groove 113a is formed in the first insertion reinforcement part 113 so that the upper end of the web 120 can be inserted. The first insertion reinforcement part 113 reinforces the strength of the top flange 110 portion to which the upper end of the web 120 is coupled, and the first insertion groove 113a increases the contact area with the upper end of the web 120. increases to maintain a stable bonding state.

And, inside the bottom portion of the top flange 110 formed on the first insertion reinforcement portion 113, a top connection thickness reinforcement portion 113b thicker than the side surface or top portion of the top flange 110 is formed. The top connection thickness reinforcing portion 113b serves to reinforce the strength of the bottom portion of the top flange 110 connecting and coupling the upper end of the web 120.

In addition, a plurality of protruding protrusions 114 are formed on the upper surface of the top flange 110 to protrude upward at a predetermined distance from each other. These protruding protrusions 114 may be formed in a horn shape, and when a cargo is placed on top of the top flange 110 or a wooden board (not shown) is additionally placed to support the cargo, additional means for fixing the cargo or the wooden board It allows stable fixation without

The web 120 is a plate portion connecting between the top flange 110 and the bottom flange 130 . That is, the upper end of the web 120 is coupled to the lower surface of the top flange 110, and the lower end of the web 120 is coupled to the upper surface of the bottom flange 130.

A plurality of fastening grooves 121 spaced apart from each other may be formed in the web 120 . Here, the fastening groove 121 allows the end of the cross member 200 to be fastened with a fastening member composed of bolts and nuts when the cross member 200 is installed, or reinforcement connecting the side floor 310 and the web 120. When installing the frame 500, a fastening member composed of bolts and nuts can be fastened to the end of the reinforcing frame 500, and accessories necessary for the flat trailer can be mounted.

The bottom flange 130 is a plate portion coupled to the lower end of the web 120. One side of the upper surface of the bottom flange 130, more specifically, a second insertion reinforcement part 131 is formed to protrude upward at a portion where the lower end of the web 120 is coupled. A second insertion groove 131a is formed in the second insertion reinforcement part 131 so that the lower end of the web 120 can be inserted. The second insertion reinforcement part 131 reinforces the strength of the bottom flange 130 portion to which the lower end of the web 120 is coupled, and the second insertion groove 131a has a contact area with the lower end of the web 120. increases to maintain a stable bonding state.

The cross member 200 is a member connected to and disposed in the width direction of the main beam 100 . That is, the cross member 200 serves as a reinforcing member to prevent bending of the main beam 100 while being installed connected to the main beam 100 . The cross member 200 is located between the main beams 100, more specifically, between the webs 120 of the main beams 100, and both ends of the cross member 200 in the longitudinal direction are coupled to the web 120. do. At this time, the cross member 200 may be formed in the form of a square tube having a 'c'-shaped vertical cross-section, and fastening members are provided in the fastening grooves 121 of the web 120 at both ends in the longitudinal direction of the cross member 200. A fastening plate 210 having a coupling groove (not shown) may be coupled so as to be coupled through.

The floor 300, along with the main beam 100, is a part that provides a support portion capable of supporting cargo on top. The floor 300 is coupled to the top flange 110 of the main beam 100 in a state in which it is arranged parallel to the longitudinal direction of the main beam 100 on both sides of the top flange 110 of the main beam 100. install it so Here, the floor 300 includes a center floor 310 and a side floor 320 .

The center floor 310 is a portion disposed between the top flanges 110 of the main beam 100, and both sides of the center floor 310 in the width direction are coupled to the top flange 110 in a connected state. Referring to FIG. 8 , the center floor 310 has a square tube shape having a rectangular structure with a space provided therein. In addition, a reinforcing material 310a for reinforcing the structural strength of the center floor 310 is formed inside the center floor 310. At this time, the reinforcing material 310a has a vertical cross-sectional shape of a wave with peaks and valleys, The peaks and valleys of 310a) are connected to the inside of the upper surface and the inside of the bottom surface of the center floor 310 . Here, the reinforcing material 310a may be integrally formed with the center floor 310 through extrusion.

In addition, first coupling protrusions 311 are protruded from both side surfaces of the center floor 310 in the width direction, more specifically, from surfaces facing the top flange 110 . The first coupling protrusion 311 is inserted to correspond to the first coupling groove 111 of the top flange 110, and increases the contact area between the top flange 110 and the center floor 310, as well as up and down. It increases the bonding strength in the direction and maintains a stable combined state when combined by welding or fastening means such as bolts or rivets.

In addition, a wood insertion groove 312 may be formed on one side of the upper surface of the center floor 310 . This wood insertion groove 312 allows a wooden board (not shown) to be installed in an inserted state to prevent the cargo from slipping when loading cargo thereon.

In addition, a plurality of protruding protrusions 313 are formed on the upper surface of the center floor 310 to protrude upward at a predetermined distance from each other. These protruding protrusions 313 may be formed in a horn shape, and when a cargo is placed on the center floor 310 or a wooden board (not shown) is additionally placed to support the cargo, the wooden board can be secured without additional fixing means. to ensure a stable fixation.

The side floor 320 is a portion disposed between the top flange 110 of the main beam 100 and the side member 400, and both sides of the side floor 320 in the width direction are one side of the top flange 110 and It is coupled to one side of the side member 400 in a connected state. Referring to FIG. 9 , the side floor 320 has a square tube shape having a rectangular structure with a space provided therein. In addition, a reinforcing material 320a for reinforcing the structural strength of the side floor 320 is formed inside the side floor 320. At this time, the reinforcing material 320a has a vertical cross-sectional shape of a wave with peaks and valleys, The peaks and valleys of 320a) are connected to the inside of the upper surface and the inside of the bottom surface of the side floor 320 . Here, the reinforcing material 320a may be integrally formed with the side floor 320 through extrusion.

In addition, a second coupling groove 321 is formed on one side of the side floor 320 in the width direction, more specifically, on a surface facing the top flange 110 . The second coupling groove 311 is inserted to correspond to the second coupling protrusion 112 of the top flange 110, and increases the contact area between the top flange 110 and the side floor 320, as well as up and down. It increases the bonding strength in the direction and maintains a stable combined state when combined by welding or fastening means such as bolts or rivets.

In addition, a first protruding plate portion 322 is protruded from the other side surface of the side floor 320 in the width direction, more specifically, on the upper side of the surface facing the side member 400 . The first protruding plate portion 322 is inserted and arranged to correspond to the first connection groove portion 420 formed on the upper surface of the side member 400, thereby increasing the contact area between the side floor 320 and the side member 400. In addition to increasing, the side floor 320 is arranged in a seated state on the side member 400, and a stable coupling state is maintained when coupled by welding or fastening means such as bolts or rivets.

In addition, a wood insertion groove 323 may be formed on one side of the upper surface of the side floor 320 . This wood insertion groove 323 allows a wooden board (not shown) to be installed in an inserted state to prevent the cargo from slipping when loading cargo thereon.

In addition, a mounting bracket 324 may be provided on the bottom of the side floor 320 to mount various equipment or accessories installed on the flat trailer or to connect and install reinforcing members. The mounting bracket portion 420 may be formed to extend in a direction parallel to the longitudinal direction of the side floor 320 .

In addition, a mounting groove 324a is formed in the mounting bracket portion 324. The mounting groove 324a may be formed to have a 'T'-shaped vertical cross-section so as to fasten various equipment, accessories, or reinforcing members to a fastening member composed of bolts and nuts. That is, the bolt head portion of the fastening member is inserted into the mounting groove 324a to be hooked, and various equipment, accessories, or reinforcing members can be installed while the nut is fastened to the bolt shaft portion.

In addition, a plurality of protruding protrusions 325 are formed on the upper surface of the side floor 320 so as to protrude upward at a predetermined distance from each other. These protruding protrusions 325 may be formed in the shape of a horn, and when a cargo is placed on the top of the side floor 320 or a wooden board (not shown) is additionally placed to support the cargo, the wooden board can be secured without additional fixing means. to ensure a stable fixation.

The side member 400 is arranged to be connected to both ends of the longitudinal direction of the main beam 100 and both ends of the longitudinal direction of the floor 300, and also the side part of the floor 300 disposed on the outermost side, more specifically, the side floor It is a part arranged to be connected to the side part of (320). Referring to FIG. 10, the side member 400 has a rectangular structure while being disposed on the front and rear edges and the left and right edges of the flat trailer with an aluminum combination structure when viewed from a plane.

The side member 400 has a square tube shape having a rectangular structure with a space provided therein. In addition, a reinforcing material 410 for reinforcing the structural strength of the side member 400 is formed inside the side member 400. At this time, the reinforcing material 410 has a vertical cross-sectional shape of a wave with peaks and valleys, and the reinforcing material ( The crest and valley portions of 410) are connected to the inside of both sides of the side member 400. Here, the reinforcing member 410 may be integrally formed with the side member 400 through extrusion.

In addition, a first connection groove 420 may be formed at an outer edge of the upper surface of the side member 400 to extend in the longitudinal direction of the side member 400 . The first connection groove 420 allows the first protruding plate 322 of the side floor 320 to be inserted and disposed correspondingly, increasing the contact area between the side floor 320 and the side member 400. In addition, the side floor 320 is placed in a seated state on the side member 400, and a stable coupling state is maintained when coupled by welding or fastening means such as bolts or rivets.

In addition, a second protruding plate portion 430 is formed protruding from one side surface of the side member 400, that is, a surface portion facing the side floor 320, on the surface portion of the side member 400. Such a second protruding plate portion ( 430) increases the contact area between the side floor 320 and the side member 400 while supporting the edge of the bottom surface of the side floor 320 in a seated state, and provides stable coupling when combined by welding or fastening means such as bolts or rivets. keep the state

In addition, a mounting bracket 440 may be provided on the bottom of the side member 400 to mount various equipment or accessories installed on the flat trailer or to connect and install reinforcing members. The mounting bracket portion 440 may be formed to extend in a direction parallel to the longitudinal direction of the side floor 320 .

In addition, a mounting groove 440a is formed in the mounting bracket portion 440 . This mounting groove (440a) may be formed to have a 'T'-shaped vertical cross-section shape to fasten various equipment or accessories or reinforcing members with a fastening member composed of bolts and nuts. That is, the bolt head portion of the fastening member is inserted into the mounting groove 440a to be hooked, and various equipment, accessories, or reinforcing members can be installed while the nut is fastened to the bolt shaft portion.

In this way, the aluminum combination structure flatbed trailer according to an embodiment includes the top flange 110 of the main beam 100 on which cargo is seated, the center floor 310 of the floor 300, the side floor 320, and the side Since the members 400 are connected and coupled in a state of being disposed on the same horizontal line, the installation structure is simple, thereby increasing the coupling workability and increasing the structural safety.

In this way, in the aluminum combination structure flatbed trailer according to an embodiment, the main beam 100, the cross member 200, the floor 300, and the side member 400 are formed of aluminum material to reduce weight, and the main beam ( The top flange 110 of 100, the center floor 310 of the floor 300, the side floor 320, and the side member 400 are provided with reinforcing members 110a, 310a, 320a, and 410 having a corrugated cross section. Since it is integrally molded in the form of a square tube, it provides structural strength to stably load cargo. In addition, the top flange 110 and the center floor 310 are connected through the first coupling groove 111 and the first coupling protrusion 311 corresponding to each other, and the side floor 320 and the top flange 110 are mutually connected. It is connected through the corresponding second coupling groove 321 and the second coupling protrusion 112, and the first protrusion plate portion 322 of the side floor 320 and the second protrusion plate portion 430 of the side member 400 are connected. Through this, the floor 300 and the side member 400 are bonded to have stable bonding strength.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is only exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims.

100: main beam 110: top flange
120: web 130: bottom flange
200: cross member 300: floor
310: center floor 320: side floor
400: side member 500: reinforcement frame

Claims (5)

A plurality of main beams made of aluminum disposed side by side and spaced apart from each other in the longitudinal direction, a plurality of cross members made of aluminum connected and disposed at regular intervals in the longitudinal direction of the main beam, and both sides of the main beam in the longitudinal direction of the main beam An aluminum combination structure flatbed trailer composed of aluminum floors arranged side by side, both ends of the main beam in the longitudinal direction, both ends of the longitudinal direction of the floor, and side members made of aluminum coupled to the side surfaces of the floor disposed on the outermost side,
The main beam includes a top flange coupled to the floor on both sides, a web coupled to the bottom of the top flange, and a bottom flange coupled to the lower end of the web while facing the top flange,
The floor includes a center floor disposed between the top flange of the main beam and a side floor disposed between the top flange of the main beam and the side member,
The top flange of the main beam, the center floor and side floors of the floor, and the side members have a square tube shape with a reinforcing material having a corrugated cross-section on the inside,
A first coupling groove is formed on one side of the top flange facing the center floor, and a first coupling protrusion inserted to correspond to the first coupling groove is formed on both sides of the center floor facing the top flange,
A second coupling groove is formed on one side of the side floor facing the top flange, and a second coupling protrusion inserted to correspond to the second coupling groove is formed on the other side of the top flange facing the side floor,
A first protruding plate part protruding in the direction of the side member is formed on the upper side of the other side surface of the side floor facing the side member, and a first connection groove through which the first protruding plate part is inserted is formed on the upper side of the side member. A flat trailer with an aluminum combination structure in which a second protruding plate supporting the side floor is formed on one side of the surface of the side member facing the floor. The method of claim 1,
A first insertion reinforcement portion formed with a first insertion groove for engaging the upper end of the web in an inserted state is formed on the bottom surface of the top flange to which the upper end of the web is coupled, protruding downward,
On the upper surface of the bottom flange to which the lower end of the web is coupled, a second insertion reinforcement part having a second insertion groove for engaging the lower end of the web in an inserted state is formed protruding upward,
An aluminum combination structure flatbed trailer in which a saw connection thickness reinforcement part is formed inside the bottom part of the top flange where the first insertion reinforcement part is formed so as to be thicker than the side part or the top part of the top flange. The method of claim 1,
An aluminum combination structure flatbed trailer further formed with a plurality of protrusions spaced apart from each other at a predetermined interval on the upper surface of the top flange and the upper surface of the floor. The method of claim 1,
An aluminum combination structure flatbed trailer wherein wood insertion grooves are further formed on the upper surfaces of the center floor and the upper surfaces of the side floors. The method of claim 1,
An aluminum combination structure flat trailer having a mounting bracket portion further formed with mounting grooves on the bottom portion of the side floor and the bottom portion of the side member.

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