Abstract:
A freight container for air transport containing a floor element and a container structure, which is arranged on said floor element and which has lateral walls, a roof wall and a loading opening. The lateral walls and roof wall contain or are comprised of wall linings, which are composed of surface parts, in particular, of sheet metal elements. The loading opening is delimited up to the adjacent wall faces by terminating longitudinal edges. Two wall faces that abut against one another at an angle form a longitudinal edge. One or more longitudinal edges and/or terminating longitudinal edges of the container structure contain a reinforcing structure, whereby the reinforcing structure contains or is comprised of one or more surface parts, which can be reshaped once or a number of times and which are joined via joining zones in order to form the reinforcing structure. The reinforcing structure comprises a least one closed, channel-like hollow chamber extending in the direction of the longitudinal edge and is joined to the wall reinforcement via joining zones.

Description:
BACKGROUND OF THE INVENTION 
     The invention relates to a freight container for air transportation according to the preamble of claim  1 . A method for the production thereof is also within the scope of the invention. 
     Freight containers for air transportation, hereinafter called airfreight containers, are used for storing and transportation of goods by aeroplane. Goods of this type may, for example, be fragile or easily perishable goods or luggage. 
     Airfreight containers are generally adapted to the inner wall structures of the cargo space for reasons of space and can therefore adopt various spatial shapes. Apart from right-parallelepiped shapes the airfreight containers may form one or two-sided so-called balcony structures which are used for the adaptation of the container shape to the arched wall of the aeroplane fuselage for the purpose of optimum use of the cargo space. 
     Known airfreight containers are constructed from a support framework made of profiled struts and covered with metal sheets or with infilling. The profiled struts in the process take on the supporting and stiffening function for the airfreight container. The profiled struts are generally open or closed extruded structural sections. The sheet metal coverings are generally attached by riveting to the support framework. 
     A current type of airfreight container of said type is, for example, disclosed in EP 0 313 601. The described airfreight container is a straight-surfaced bordered body. It consists of a base plate and a support framework placed thereon comprising vertical side sections and horizontal top sections, wherein, on one side the side sections towards the base are inclined towards the container interior and border an oblique lower wall face. In this generally known embodiment a container balcony formed on the airfreight container is referred to. The sections are closed extruded structural sections. Webs are also formed on the sections to which the sheet metal infills for the wall faces are applied by means of riveting. 
     The production of airfreight containers is very complex and expensive as the most varied parts, such as individual sections, sheet metal infills or gusset plates, have to be produced, machined and assembled into a complete airfreight container. For this purpose, the sectioned struts have to be assembled in first steps into a support framework and then the sheet metal lining has to be attached to the support framework 
     The production of extruded structural sections, in particular extruded structural sections with closed cavities, is also complex and expensive. 
     U.S. Pat. No. 5,645,184 also describes a freight container for air transportation comprising expandable regions which could absorb the explosion energy of an explosion triggered in the freight container. The expandable structures relate to wave-shaped or harmonica-shaped layers in the wall regions which are stretched under the pressure of explosion. The expandable structures may be connected to one another in the corner regions by angled, flat corner elements. 
     U.S. Pat. No. 6,112,931 describes a freight container for air transportation which is also designed for the absorption of explosion energy. The wall regions also comprise wavy, expandable reinforcing layers. The wall elements are connected to one another in the corner regions by corner connections made of a fibre-reinforced plastics material. 
     It is the object of the invention to provide a self-supporting freight container for air transportation with a low weight and high stability, of which the individual components can be prefabricated simply and economically and with as little complexity as possible, and assembled. 
     SUMMARY OF THE INVENTION 
     The object is achieved by providing a container structure which is expediently a straight-surfaced bordered body and consists of plane wall faces, wherein two respective adjacent wall faces abut one another at an angle with the formation of a longitudinal edge. The container structure comprises a top wall, a rear and front side wall, the loading aperture preferably being provided in the front side wall, and an inner and outer side wall. Said walls in the process form the mentioned wall faces. The longitudinal edges at which the side walls abut one another are, with the exception of the longitudinal edges at the wall face of a balcony formation, inclined obliquely inwardly, suitably vertical longitudinal edges. The longitudinal edges at which the top wall abuts the side wall, are suitably horizontal longitudinal edges. 
     The container structure may also comprise two or more lateral loading apertures. The container structure may in particular contain two loading apertures, the first loading apertures being arranged in the front side wall and the second in the rear side wall. The front and rear side wall may be formed in a mirror-inverted manner in this embodiment. 
     The container structure may be right-parallelepiped or form a so-called container balcony at the outer and inner side wall. The container balcony is distinguished by a two-part side wall with an upper wall face and a lower wall face adjoining the upper wall face, the upper wall face having a vertical orientation and the lower wall face being inclined obliquely to the base element and towards the container interior. The lower side wall with the base element and the upper wall face encloses an obtuse angle in each case. 
     In container structures with a container balcony arranged on one side, the outer side wall is the container side formed in a balcony-like manner and facing the cargo space or internal aeroplane wall, while the inner side wall is the container side facing the cargo space interior and without a balcony formation. 
     Meant by surface parts are in particular flat, board-shaped or band-shaped parts. The surface parts of the wall lining and/or the reinforcement structure are preferably sheet metal elements or sheet metal parts. The surface parts of the wall lining and/or the reinforcement structure consist suitably of metal and preferably of aluminium or an aluminium alloy. The surface parts of the wall lining and/or the reinforcement structure may be made of a ferrous metal, such as iron, galvanised iron, steel, a non-ferrous metal or magnesium or a magnesium alloy. Included in the term sheet metal, sheet metal element or sheet metal part are in particular rolled products made of metal in the form of level, flat boards or bands. The thickness of the sheet metal elements is preferably between 0 mm and 10 mm, preferably between 0.4 mm and 5 mm and in particular between 0.6 mm and 1.5 mm. 
     The top wall and the side walls are, with the exception of the loading aperture, suitably lined with or consist of surface parts, in particular sheet metal elements, wherein the surface parts preferably have surface portions bordered over a straight area at least in the wall face. The wall linings preferably consist of aluminium or an aluminium alloy. 
     Arranged on the front side wall of the container structure, and optionally on the front and rear side wall is suitably a lateral loading aperture which is bordered by two vertical and one horizontal, top end longitudinal edge of the adjoining wall faces. 
     The reinforcement structures according to the invention may be provided on individual or all longitudinal and/or end longitudinal edges. The reinforcement structures according to the invention are preferably provided at least on one or more or all vertically oriented longitudinal edges. The reinforcement structures according to the invention are also provided on the vertical end longitudinal edges and in particular on the two vertical and the horizontal, top end longitudinal edges of the loading aperture. 
     The surface part or parts of the reinforcement structure are suitably connected to one another and to the wall lining by way of joining zones. The joining zones are preferably flat joining zones, in which surfaces portions of the surface parts forming the reinforcement structure with their large-area sides abut one another and/or the large-area sides of surface portions of the adjoining wall lining with the formation of a type of overlapping region. 
     The surface parts of the reinforcement structure are joined to the reinforcement structure preferably by means of riveting, such as tension-shear riveting, screwing, clinching, gluing and/or welding and/or connected to the adjoining wall linings. 
     To produce the connection between the individual surface parts connecting elements in general can be used, in other words aids for joining two components, such as adhesives, rivets, in particular tension-shear rivets, screws, clinches or welds. 
     The reinforcement structure preferably consists completely of shaped surface parts, in particular of shaped sheet metal elements and connecting elements. In a preferred embodiment, one or more, and in particular two, shaped surface parts form a reinforcement structure with at least one closed, channel-like cavity, preferably at least one of these closed channel-like cavities of the reinforcement structure extends over the entire longitudinal edge and extends substantially parallel to the longitudinal edge direction. The channel-like cavities of the reinforcement structure may also extend over one or more sections of the longitudinal edge and substantially parallel to the longitudinal edge direction. 
     The reinforcement structure suitably forms a bulge-like expanse and preferably has an overall width measured orthogonally to the adjacent wall face plane, which is greater than the thickness of the wall lining by a factor of 2, preferably a factor of 5 and in particular a factor of 10. 
     The reinforcement structure may also have two or more closed, channel-like cavities. Furthermore, two or more of said cavities may extend over the entire longitudinal edge substantially parallel to the longitudinal edge direction. 
     In a preferred embodiment at least one surface part of the reinforcement structure forms an open, groove-like hollow space or a closed, channel-like cavity. Said hollow space or cavity extends preferably over the entire longitudinal edge and extends substantially parallel to the longitudinal edge direction. Said surface part with an open hollow space with one or more further surface parts of the reinforcement structure suitably forms a closed cavity. The open, groove-like hollow space of said surface part may, for example have a U, V, C or Z cross-section. The open, groove-like hollow space may in particular have undercuts. Moreover, a plurality of open, groove-like hollow spaces extending in parallel or lying at an angle to one another may be formed in a surface part. 
     The surface part may in particular have beading, i.e. groove-like recesses, the depth of the groove being small relative to its length. The beading may be semi-circular beading, box beading, trapezoidal beading, triangular beading, multiple beading. Furthermore, closed or open beading may be provided. The beading may be mutually parallel as multiple beading or beading formed as groups of beading lying at an angle to one another. Because of the beading, the resistance of a metal sheet to elastic and plastic shape changes in the event of bending and torsional stress is increased by the increase in the moment of inertia or resistance. The stiffening effect of a beading depends on the predetermined sheet metal material and in the case of predetermined cross-sectional shape and metal sheet thickness, predominantly on the beading depth. Said surface part with beading forms a plurality of closed cavities, preferably with one or more further surface parts of the reinforcement structure. 
     The reinforcement structure, in particular of the vertical longitudinal edges and the end longitudinal edges, suitably consists of one or more external surface parts, i.e. remote from the container interior, forming an outer structural wall and one or more internal surface parts facing the container content, forming an inner structure wall. 
     The external surface part (or parts) of the reinforcement structure forming the outer structural wall is preferably a sheet metal element shaped in a section-like manner from a sheet metal strip or a plastic part, for example a fibre-reinforced plastic part. 
     The external surface part (or parts) of the reinforcement structure, which is not a part of the wall lining, preferably has a greater thickness than the internal surface part (or parts), which may be a part of the wall lining, all the surface parts consisting of sheet metal elements. The external surface part (or parts) may for example have a thickness which is greater by 5 to 100%, preferably 10 to 50%, than the internal surface part (or parts). 
     Preferably, at least one of the surface parts, as a part of the reinforcement structure, simultaneously forms the wall lining. Said surface part for this purpose is shaped at its edge-side end portion surface facing the longitudinal edge and forms with this end portion surface a part of the reinforcement structure. The surface part simultaneously forming the wall lining preferably forms the, or an, internal surface part or the inner structural wall of the reinforcement structure. 
     In a first embodiment of the invention, two shaped surface parts, in particular sheet metal elements, are joined to form a stiffening structure with the formation of at least one closed cavity, one of the surface parts simultaneously forming the wall lining and being shaped at a lateral end portion surface into a part of the stiffening structure. The surface part of the reinforcement structure simultaneously forming the wall lining preferably forms the inner structural wall. The individual surface parts of the reinforcement structure are connected to one another and/or to the wall linings, by way of flat joining zones. 
     In a further embodiment of the invention the surface part of a first wall lining with an end portion surface at the longitudinal edge is shaped towards the adjacent second wall face and joined to the wall lining of the second wall face. The wall lining may also be shaped with the two end portion surfaces on the corresponding longitudinal edge towards the adjacent wall face and be joined to the adjacent wall lining. An external shaped surface part is placed on the outside on the longitudinal edge with the formation of at least one closed channel-like cavity extending in the longitudinal edge direction. The external surface part is joined to the end portion surface of the first wall lining or to the end portion surfaces of the first and second wall lining. 
     In a further embodiment of the invention two shaped surface parts, in particular sheet metal elements, are joined to form a section-like reinforcement structure with the formation of at least one closed, channel-like cavity. The two surface parts preferably form, towards the two wall faces, a flat joining zone in the form of a longitudinal web, in which the two surface parts mutually abut with their end portion surfaces. The wall lining is attached by riveting to the web-like joining zones. The wall lining consists of sheet metal plates. 
     The surface parts of the reinforcement structure according to the invention, in particular the surface parts as sheet metal elements, are preferably shaped by means of a bending method, such as free bending, edging, edging pressing, folding or edge rolling or by means of roll forming. Moreover, the surface parts can also be shaped by means of a deep-drawing method, stretching forming, extruding or by means of roll bending. Combinations of the above-mentioned forming methods are conceivable. 
     The reinforcement structures may also comprise webs, ribs or flanges and recesses or indents, for example for receiving functional elements. 
     The reinforcement structures substantially take on the function of the previously used extruded cavity sections. The reinforcement structures, as a part of the container structure, preferably have a hollow section-like structure. 
     To reinforce the container structure, gusset or connecting elements can be used, preferably as sheet metal elements, at the longitudinal edges, and in particular in the corner regions of the longitudinal edges. In particular, the container structure can be connected to the base element, inter alia by means of gusset and connecting plates. The gusset plates are expediently made of ferrous metals, such as iron, galvanised iron, steel, non-ferrous metals such as brass, copper, magnesium and its alloys and preferably of aluminium or its alloys. The gusset plates are preferably installed by rivets, in particular by means of tension-shear rivets, into the structure. The gusset or connecting elements may also consist of plastics materials, suitably of reinforced, in particular fibre-reinforced plastics materials, preferably of carbon or glass fibre-reinforced plastics or of composite materials, in particular of metal-plastic composite materials. 
     The container structure without doors and closure systems consists in a preferred embodiment of the invention completely of sheet metal elements and connecting elements, in other words the container structure contains in particular no extruded structural sections. However, extruded structural sections can also be used at points and for local reinforcement in the container structure constructed substantially of sheet metal elements. 
     The container structure may also comprise differently formed reinforcement structures at the longitudinal and/or end longitudinal edges. 
     The loading aperture of the container structure suitably comprises a container door. The container door may, for example, be a flexible door or door tarpaulin which can be rolled up or pivoted in the vertical direction, as described in EP 0 533 626. Doors which can be rolled up can be fastened, for example at their top end, by way of piping sections to the reinforcement structure of the horizontal, top external longitudinal edge and at their base end laterally by way of locking devices or by way of horizontally arranged belts at the laterally abutting, vertical reinforcement structure of the outer longitudinal edges. 
     In a further variation, the container door is equipped with a so-called Barless closure, as described, for example in EP 1 061 009, in particular in  FIG. 5   a  to  c  and the associated figure description. Horizontally extending closure belts are attached to a door tarpaulin. The closure belts may, for example, be sewn onto the door tarpaulin. The closure belts are pulled by their extended ends through loops at the lateral reinforcement structures of the vertical outer longitudinal edges. By tightening the belts the door tarpaulin is tensioned, wherein the belt portions of the extended belt ends guided through the loops are turned back and fixed on the door tarpaulin by the burr or Velcro® closure principle to the belt portion located therebelow. Attached at the base end of the door tarpaulin is a closure belt which is also guided with its extended ends through loops on the lateral reinforcement structures of the vertical outer longitudinal edges and as described above, pulled tight and fixed. The base closure belt may also be hooked at its ends by means of hook elements attached there to the loop and then pulled tight by means of belt tensioners, so the tarpaulin is tensioned. In this variation of a Barless closure no closure devices, such as snap closures or latch closures let into the reinforcement structure or attached thereto, are necessary. The loops may, for example be U-shaped elements with lateral connecting faces or webs made of metal or plastics material fastened to the reinforcement structure by riveting, screwing or gluing. The door tarpaulin at its top closure is expediently let into a piping groove of a hinge section attached by means of riveting to the reinforcement structure of the top outer longitudinal edge. 
     The wall lining, in particular the wall lining which is not a component of the reinforcement structure, may also be made out of textile fabrics, in particular of textile woven fabrics or of plastic elements, in particular of fibre-reinforced plastic elements or of composite materials, in particular of metal-plastic composite materials. 
     In the joining zones of the reinforcement structure sealing elements, for example in the form of sealing strips, can be provided. The sealing elements advantageously consist of plastics material, preferably of an elastomer or polyvinyl chloride (PVC) and are introduced for example by gluing in the joining zone. 
     The base element may be a conventional base element corresponding to the prior art, designed either as a base element for transportation by wheeled truck or as a base element for transportation by fork-lift trucks. In the latter case, the base element comprises so-called pockets or channels, which are provided for receiving the forks or prongs of the fork-lift truck. 
     The invention also relates to a method for producing an airfreight container which is distinguished in that the wall linings and the surface parts of the reinforcement structure are cut to size into sheet metal elements from rolled sheets and are bent in bending machines into structures intended for the purpose, and the preformed sheet metal elements are joined together as wall linings and surface parts of the reinforcement structures by means of connecting elements, such as rivets or adhesive, into a container structure with reinforcement structures. 
     The airfreight container according to the invention may have the conventional and common measurements and dimensions for airfreight containers and with respect to the shape, the size, the conditions for aviation approval and handling is comparable to conventional standard airfreight containers. The airfreight container according to the invention is equal to known standard airfreight containers with respect to strength, stability, quality, service life, maintenance requirement and repairability. The airfreight container according to the invention needs no, or substantially less, expensive extruded structural sections to achieve the necessary stability than conventional airfreight containers. The process procedures are substantially simplified and costs saved by the production of the airfreight containers from substantially shaped, in particular bent, sheet metal elements. The airfreight container according to the invention is up to 20% lighter compared to comparable airfreight containers according to the prior art. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The invention will be described in more detail hereinafter with reference to examples and with the aid of the accompanying drawings, in which: 
         FIG. 1  shows a schematic view of an airfreight container with a balcony; 
         FIG. 2   a  shows a cross-sectional view of the vertical longitudinal edges of an airfreight container along the section lines A-A, B-B, C-C and E-E; 
         FIG. 2   b  shows a cross-sectional view through the top wall of an airfreight container along the section line D-D; 
         FIG. 3  shows a cross-sectional view of the vertical longitudinal edges of a further airfreight container; 
         FIGS. 4 to 9  shows cross-sections through further reinforcement structures. 
     
    
    
     DETAILED DESCRIPTION 
     Arranged on a base element  8  is a container structure  1  with a rear side wall  3 , a front side wall  2 , an inner side wall  4 , an outer side wall  6  and a top wall  7  ( FIG. 1 ). Formed on the outer side wall  6  is a balcony structure with an upper wall face  11  and a lower wall face  9  inclined obliquely to the container interior and toward the base element  8 . The front side wall  2  also comprises a loading aperture  5  which can be closed by a rollable container door  10 . 
       FIG. 2   a  shows a horizontal area section through the container structure  1  according to  FIG. 1 . The container structure  1  comprises in total five vertically oriented reinforcement structures  25   a, b, c, d, e  of which four reinforcement structures  25   a, b, c, d  are each arranged at the longitudinal edges between the individual side walls  2 ,  3 ,  4 ,  6 . Two reinforcement structures  25   c, e  form the two vertical outer longitudinal edges of the loading aperture  5 . The reinforcement structures  25   a, b, c, d, e  each consist of an external surface part forming an outer structural wall  20   a, b, c, d, e  and an internal surface part forming an inner structural wall. The same reference numerals are used, in each case, to designate the structural wall and the surface parts. The structural walls are formed from sheet metal elements, which are assembled by prior bending and mutual joining into said reinforcement structure  25   a, b, c, d, e . The outer and inner structural walls together enclose a closed, channel-like cavity extending in the longitudinal edge direction. The outer, structural wall  20   a, b, c, d, e  which is exposed to high stress is formed from a sheet metal strip and has a greater thickness compared to the inner structural wall  27   a, b, c, d, e , so the reinforcement structure is provided with greater stability. The two structural walls form flat joining zones towards each side wall  2 ,  3 ,  4 ,  6  or towards the loading aperture  5 , to which joining zones the wall linings  24 ,  22 ,  23 ,  21  of the side walls  2 ,  3 ,  4 ,  6  are joined. The sheet metal elements of the reinforcement structure  25   a, b, c, d, e  are also mutually joined at the flat joining zones. The connections are effected by means of riveting  52 . The wall linings  24 ,  22 ,  23 ,  21  consist of sheet metal elements. Both the sheet metal elements of the structural walls and the wall linings are made of aluminium or an aluminium alloy. 
     The section line A-A shows the horizontal section through the upper wall face  11  of the outer side wall  6  according to  FIG. 1 . A respective reinforcement structure  25   a, d  is arranged at the longitudinal edges between the outer side wall  6  and the rear side wall  3  or the front side wall  2 . The inner structural walls  27   a, d  of the two reinforcement structures  25   a, d  are formed from the extended end portion surfaces of the rear or front wall lining  22 ,  24  and bent by way of the longitudinal edge into the adjacent wall face. The two external sheet metal elements of the outer structural walls  20   a, d  are also bent by way of the longitudinal edge into the adjacent wall faces. The wall lining  21  of the outer side wall  6  is inserted in the region of the joining zones between the respective outer and inner structural wall of the two reinforcement structures  25   a, d  and joined to the reinforcement structure  25   a, d  by means of riveting  52 . 
     The section line B-B shows the horizontal section though the inner side wall  4 . Arranged at the longitudinal edges between the inner side wall  4  and the rear side wall  3  or the front side wall  2  is a further respective reinforcement structure  25   b, c . The inner structural wall  27   b  of the reinforcement structure  20   b  to the rear side wall  3  is formed from an extended end portion surface of the inner wall lining  23  which is bent by way of the longitudinal edge into the adjacent wall face. The rear wall lining  22  is pushed at the joining zone to the reinforcement structure  25   b  between the inner and outer structural wall  27   b ,  20   b  and connected to the reinforcement structure  25   b  by means of riveting  52 . The reinforcement structure  25   c  arranged at the front side wall  2  forms a first vertical outer longitudinal edge of the loading aperture  5 . The inner structural wall  27   c  is made of a bent sheet metal strip. The two structural walls  20   c ,  27   c  form flat joining zones towards the inner side wall and towards the loading aperture  5 , at which the sheet metal elements  20   c ,  27   c  are joined by means of riveting  52 . The inner wall lining  23  is pushed at the door-side reinforcement structure  25   c  into the joining zone between the external and internal structural wall  20   c ,  27   c  and is joined by means of riveting  52  to the reinforcement structure  25   c . An edge protection  51  is also attached by way of the door-side joining zone, which edge protection  51  is joined together with the sheet metal elements  20   c ,  27   c  by means of riveting  52 . The sheet metal element of the outer structural wall  20   b, c  of the two reinforcement structures  25   b, c  is bent by way of the respective longitudinal edge into the adjacent wall faces. 
     Arranged on the other side of the loading aperture  5  is a second reinforcement structure  25   e  which forms a further vertical outer longitudinal edge of the loading aperture  5  (section line C-C). The front wall lining  24  forms with its two extended end portion surfaces the inner structural wall  27   e, d  of the two reinforcement structures  20   e, d , the end portion surface directed to the outer side wall  6  being bent by way of the longitudinal edge into the outer side wall  6 . The inner and outer structural walls form flat joining zones towards the adjacent wall faces or towards the loading aperture, at which zones the sheet metal elements of the structural walls are mutually joined by means of riveting  52 . An edge protection  51  is also attached by way of the door-side joining zone of the second reinforcement structure  25   e , which edge protection  51  is joined together with the two structural walls  20   e ,  27   e  by means of riveting  52 . 
     The section line E-E shows the horizontal section through the rear side wall  3 . Arranged at the longitudinal edges between the rear side wall  3  and the outer side wall  6  or the inner side wall  4  is a respective reinforcement structure  25   a, b , with a structure described above. 
     The section line D-D shows the horizontal section through the top wall  7  according to  FIG. 1  (see  FIG. 2   b ). Arranged towards the front side wall  2  is a horizontal reinforcement structure  25   f  which in the region of the loading aperture  5  forms the upper horizontal outer longitudinal edge. 
     The horizontal reinforcement structure  25   f  consists of an outer and an inner structural wall  20   f ,  27   f , the outer structural wall  20   f  having a greater thickness than the inner structural wall  27   f . The inner structural wall  27   f  is formed from the extended end portion surface of the top wall lining  28  and is bent by way of the outer longitudinal edge into the front side wall  2 . The outer structural wall  20   f  is also bent by way of the longitudinal edge. The two structural walls  20   f ,  27   f  form flat joining zones towards the front side wall  2  and the top wall  7 , at which joining zones the sheet metal elements of the structural walls are joined together by means of riveting  52 . The top wall lining  28  is pushed at the joining zone between the outer and inner structural wall  20   f ,  20   f  and joined to the reinforcement structure  25   c  by means of riveting  52 . An edge protection  51  is attached to the joining zone pointing to the loading aperture  5 , the edge protection  51  being joined by means of riveting  52 , in particular by means of tension-shear rivets, to the reinforcement structure. 
     The top wall lining  28 , towards the rear, the outer and the inner side wall  3 ,  6 ,  4 , has a respective end portion surface which is angled by way of the horizontal longitudinal edges into the corresponding side wall  3 ,  6 ,  4 . The angled end portion surfaces have horizontally extending reinforcement grooves in the form of beading  26 . The angled end portion surfaces with the corresponding side wall linings  21 ,  22 ,  23  form joining zones in the form of overlapping regions, at which the top wall lining is joined to the corresponding side wall linings  21 ,  22 ,  23  by way of riveting  53 . 
       FIG. 3  shows a horizontal area section through a container structure of a further embodiment variation according to  FIG. 1 . The container structure comprises a total of five vertically directed reinforcement structures  45   a, b, c, d, e  of which four reinforcement structures  45   a, b, c, d  are each arranged at the longitudinal edges between the individual side walls  32 ,  33 ,  34 ,  36 . Two reinforcement structures  45   c, e  form the two vertical outer longitudinal edges of the loading aperture  35 . The reinforcement structures  45   a, b, c, d, e  each consist of an external surface part forming an outer structural wall  30   a, b, c, d, e  and an internal surface part forming an inner structural wall  41   a, b, c, d, e . The same reference numerals are used in each case to designate the structural wall and the surface parts. The structural walls are formed from sheet metal elements formed by prior bending and mutual joining to said reinforcement structure  45   a, b, c, d, e . The outer and inner structural wall in the process together enclose a channel-like cavity extending in the longitudinal direction. Both the outer and the inner structural wall are formed from a respective sheet metal strip bent by way of the longitudinal edge into the adjacent wall faces. The two structural walls form a flat joining zone towards each side wall  32 ,  33 ,  34 ,  36  or towards the loading aperture  35 , at which joining zones the structural walls are joined to one another and to the adjacent wall linings by means of riveting  52 . The outer structural wall  30   a, b, c, d, e  which is exposed to higher stress has a greater thickness relative to the inner structural wall  41   a, b, c, d, e , so the reinforcement structure is provided with higher stability. The wall linings of the side walls  2 ,  3 ,  4 ,  6  consist of sheet metal elements. Both the sheet metal elements of the structural walls and also the wall linings are made of aluminium or an aluminium alloy. 
     The section line A-A shows the horizontal section through the upper wall face  11  of the outer side wall  6  according to  FIG. 1 . Arranged at the longitudinal edges between the outer side wall  36  and the rear side wall  33  or the front side wall  32  are two reinforcement structures  45   a, d . The inner structural wall  41   a, d  and the outer structural wall  30   a, d  of the two reinforcement structures  45   a, d  are bent by way of the longitudinal edge into the adjacent wall faces. The wall lining  46  of the outer side wall  36  in the region of the joining zones is inserted between the respective outer and inner structural wall of the two reinforcement structures  45   a, d  and joined to the reinforcement structure  45   a, d  by means of riveting  52 , in particular by means of tension-shear rivets, to the reinforcement structure  45   a, d.    
     The section line B-B shows the horizontal section through the inner side wall  4  according to  FIG. 1 . Arranged at the longitudinal edges between the inner side wall  34  and the rear side wall  33  or the front side wall  32  is a respective reinforcement structure  45   b, c . The inner structural wall  41   b, c  and the outer structural wall  30   b, c  of the two reinforcement structures  45   b, c  are bent by way of the longitudinal edge into the adjacent wall faces. The rear wall lining  37  at the joining zone is pushed to the rear reinforcement structure  45   a, b  between the inner and outer structural wall and joined to the reinforcement structure  45   a, b  by means of riveting  52 . The wall lining  38  of the inner side wall  34  in the region of the joining zones is inserted between the outer and inner respective structural wall of the two reinforcement structures  45   b, c  and joined to the reinforcement structures  45   b, c  by means of riveting  52 . 
     The reinforcement structure  45   c  arranged towards the front side wall  32  forms a first vertical outer longitudinal edge of the loading aperture  35 . The two outer and inner structural walls  30   c ,  41   c  form a flat joining zone towards the inner side wall  34  and the loading aperture  35 , at which joining zones the sheet metal elements of the structural walls  30   c ,  41   c  are joined by means of riveting  52 . An edge protection  51  is attached by way of the door-side joining zone by means of riveting  52 . 
     Arranged on the other side of the loading aperture  35  is arranged a further reinforcement structure  45   e  forming the second vertical outer longitudinal edge of the loading aperture  35  (section line C-C). The inner and outer structural walls form flat joining zones towards the adjacent wall faces or the loading aperture, at which joining zones the sheet metal elements of the structural walls are joined to one another and to the adjacent wall linings by means of riveting  52 . An edge protection  51  is also attached by way of the door-side joining zone of the second reinforcement structure  45   e , which edge protection  51  is joined together with the two structural walls  30   e ,  41   e  by means of riveting  52 . 
     The section line E-E shows the horizontal section through the rear side wall  33 . Arranged at the longitudinal edges between the rear side wall  33  and the outer side wall  36  or the inner side wall  34  is a respective reinforcement structure  45   a, b , with a structure described above. 
     The individual reinforcement structures according to  FIGS. 1 and 2  may obviously also be used in any other combinations. 
     The reinforcement structure  60  of a further embodiment variation according to  FIG. 4  consists of a sheet metal element  61  shaped into a hollow section by multiple bending, which forms both the outer and the inner structural wall  65 ,  66 . The sheet metal element  61  forms a flat joining zone, to which the two end portion surfaces of the sheet metal element  61  and the adjacent first wall lining  64 , pushed between the outer and inner structural wall  65 ,  66 , is joined by riveting  52 . The reinforcement structure  60  also forms a web  67  at which the second wall lining  63  is attached to the reinforcement structure by means of riveting  52 . The wall linings  63 ,  64  consist of sheet metal elements. Both the sheet metal elements of the structural walls and the wall linings are made of aluminium or an aluminium alloy. 
     The reinforcement structure  70  of a further embodiment variation according to  FIG. 5  consists of an inner and an outer structural wall  71 ,  72 , which together enclose a closed channel-like cavity. The outer structural wall  72  consists of a sheet metal strip multiply shaped by bending. The inner structural wall  72  is formed from the wall lining  71 . The two structural walls  71 ,  72  are joined together by way of joining zones by means of riveting  52 . The wall lining  71  consists of a sheet metal element. Both the sheet metal elements of the structural walls and the wall lining are made of aluminium or an aluminium alloy. 
     The thickness of the individual sheet metal elements, in particular the thickness of the outer and inner structural wall in the above-mentioned embodiments from  FIGS. 2 to 5  may also be uniform. The container structures according to  FIGS. 2 and 3  can also be two opposing loading apertures provided in the front and rear side wall, wherein a container structure of this type would comprise six vertical reinforcement structures. 
       FIG. 6  shows a reinforcement structure  100  formed by a first wall lining  101  forming the outer structural wall and a surface element  103  forming the inner structural wall. The two structural walls are shaped accordingly with the formation of a hollow section-like reinforcement structure, the first wall lining  101  with its end portion surface being bent into the adjacent wall face. A second wall lining  102  adjoins the reinforcement structure  100  by way of a flat joining zone. 
       FIG. 7  shows a reinforcement structure formed by a top wall lining  111  forming the outer structural wall and a surface element  113  forming the inner structural wall. The two structural walls are shaped accordingly with the formation of a hollow section-like reinforcement structure, wherein the top wall lining  111  with its end portion surface is bent into the adjacent wall face. 
       FIGS. 8 and 9  show reinforcement structures in a side wall face. The reinforcement structure  120  according to  FIG. 8  shows a continuous wall lining  121  forming the outer structural wall and a surface element  122  forming the inner structural wall. The two structural walls are shaped accordingly with the formation of a hollow section-like reinforcement structure.  FIG. 9  shows a side wall assembled from a first and a second wall lining  131 ,  133  in the region of a reinforcement structure  130 . The reinforcement structure is formed by a first wall lining  131  forming the outer structural wall and a surface element  132  forming the inner structural wall. The two structural walls are shaped accordingly with the formation of a hollow section-like reinforcement structure. The second wall lining  133  adjoins the reinforcement structure  130  by way of a flat joining zone. 
     The reinforcement structures according to  FIGS. 8 and 9  may also be used in the top wall face.