Abstract:
The invention relates to a metallic frame structure of a container-like, modular and mobile housing, an assembly kit for such a housing, a container-like, modular and mobile housing, as well as a hollow profile for such a housing. The hollow profile which is designed as a floor main profile ( 1 ), roof main profile ( 2 ) and/or support profile ( 3 ) for the metallic frame structure, has a longitudinal structure ( 71, 72 , . . . ) extending along the longitudinal direction of the profile and originating from an outer profile surface. The longitudinal structure is formed as a longitudinal elevation or longitudinal groove and has a width at its attachment to the profile outer surface of less than 20, 15 or 10 millimetres in the direction transverse to the longitudinal direction of the profile.

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application is a National Stage of PCT International patent application no. PCT/DE2013/100149, filed 23 Apr. 2013, which claimed priority in German patent application no. 10 2012 103 719.1, filed 27 Apr. 2012, the contents of these documents incorporated herein by reference. 
     
    
     TECHNICAL FIELD 
       [0002]    The invention relates to the field of container-like, modular and mobile housing/housing units. Housing of this kind can refer in particular to residential containers, office containers or room modules. These serve as rooms for living and/or working at locations where they are required occasionally and temporarily. Examples include office containers for construction workers and construction engineers close to a building site and accommodation for aid workers and victims in disaster zones. The mobile housing unit must hereby have specific minimum dimensions in order to be able to hold the required articles and equipment for the relevant intended purpose, by way of example, bedroom and office furniture and the like. The housing unit must moreover be stable enough to withstand possible severe weather conditions and, where applicable, also to be stackable into a housing or working settlement. 
       BACKGROUND 
       [0003]    One of the construction methods for office containers, which is commercially very successful and has a high acceptance rate, especially when used at building sites, is a sea-container-like modular structure which is widespread in Europe and especially in Germany. In recent years, there likewise seems to be a trend for using such modular structures in the Far East, in North America and elsewhere. Various designs are thereby available, from lightweight, favourably-priced construction methods up to heavy and higher-quality constructions that meet the highest safety standards. They offer good heat insulation and meet the requirements of the building regulations in most developed countries. 
         [0004]    There are, however, drawbacks which are connected to the manufacture, transport and handling of such large, modular units. In particular, the manufacture of the conventional container frame is very labour-intensive and requires extensive welding work and a lot of surface finishing work such that the production can take up a lot of time. Furthermore, the size and the width of such modules are, as a rule, limited to the height and width of a transport vehicle, which makes covering large distances (more particularly in the case of transport overseas) impractical and expensive for larger structural units. The loading and unloading of conventional office containers, even in collapsed form, also furthermore requires special equipment such as cranes and forklift trucks. Because of the low production rate and the restricted transport possibilities, a sudden high demand cannot readily be met, as, by way of example, in the event of natural disasters. 
       SUMMARY OF THE INVENTION 
       [0005]    It is the object of the invention to provide a mobile housing unit, a frame structure and an assembly kit for this, as well as a corresponding hollow profile for the frame structure, which can be manufactured cost-effectively and can be supplied at short-term notice. In particular, such housing units should be characterized by short-term availability and a simple, intermediate storage. 
         [0006]    This is achieved, in accordance with the invention, by a metallic frame structure of a container-like, modular and mobile housing unit, more particularly a residential container, an office container or a room module, comprising horizontal main floor profiles which are connected detachably to one another to form a floor frame. Horizontal main roof profiles are connected detachably to one another to form a roof frame. Vertical support profiles are each connected detachably to the main floor profiles of the floor frame by means of a floor corner connection and to the main roof profiles of the roof frame by means of a roof corner connection so that the floor frame and the roof frame are connected together parallel and at a vertical distance from one another. The support profiles are designed and arranged so that when stacking two or more frame structures on top of each other, the frame structure stacked on top is supported mainly by means of the vertical support profiles. At least one of the main floor profiles, the main roof profiles and/or the support profiles is a hollow profile of metal which has a longitudinal structure extending along the longitudinal direction of the profile and originating from an outer profile surface, which longitudinal structure is designed as a longitudinal elevation or longitudinal groove and has a width of less than 20, 15 or 10 millimeters at its origin at the outer profile surface in the direction transverse to the longitudinal direction of the profile. Further advantageous refinements of the invention are provided in the dependent claims. 
         [0007]    The invention is based on the idea of providing a system of profiles for the assembly of a mobile housing unit, wherein the profiles are first assembled in a simple and secure way into a frame structure for the housing unit. This frame structure can then be conjoined by additional wall, roof and floor elements in order to form the complete housing unit. The profiles are connectable-detachable, in particular by means of plug-in/slot-in, clamp, and/or screw connections. The otherwise conventional welding work that is usually necessary during assembly is hereby avoided. In this way, the assembly costs and the assembly times of such housing units could thus be reduced. In addition, a short-notice availability, a simple, intermediate storage, as well as an application of such housing units for various purposes would become possible. 
         [0008]    The devices described herein have a series of advantages based on the use of profiles having longitudinal structures that can be configured in any way. They can offer a uniform and systematic method of construction for relatively stable and strong frame structures of metal that are transportable and stackable. They permit a simple assembly, a construction that is flexible according to size, and high mobility, as well as an efficient assembly and dismantling. They allow numerous functionalities, based on the wide variety of possible designs for the longitudinal structures, a rapid manufacturing process, the use of sustained manufacturing processes, low production costs, and ease of storage, packing, transporting, handling, maintenance and repair. Furthermore, the use of many standard types of floor, roof and wall elements is made possible. 
         [0009]    Because of the longitudinal structuring of the profiles, a higher rigidity and bending resistance can be obtained, so that, in turn, metal profiles with a reduced wall thickness can be used. In this way, the weight and the costs can be kept low. 
         [0010]    The container-like, modular and mobile housing unit is an inherently closed, modular, self-supporting building which is transportable and can be used as a temporary office, as living space, or as an emergency shelter. Such a housing unit is similar in shape and size to a conventional sea container. It has, however, an essentially lighter frame construction, which, as a rule, has to be built according to binding construction regulations. Such modular housing units can be combined and/or stacked to erect two-, three- or higher-storied buildings. What differentiates such container-like modular buildings from other types of modular constructions is, in particular, the construction of the frame, which provides the office container with its characteristic container shape. The metallic frame structure, and thus also the mobile housing unit formed therefrom, preferably has a length of at least 2, 3, 4, 5 or 6 meters, a width of at least 1, 1.5 or 2 meters and/or a height of at least 1, 1.5, 2 or 2.5 meters. It is particularly preferred if the housing unit has the dimensions of a 20-foot or a 40-foot ISO container. In preferred embodiments the mobile housing unit can have a width of up to 3 meters, a length of up to 10 or 13 meters and/or a height of up to 3 meters, where applicable in combination with one of the previously mentioned dimensions. 
         [0011]    The metallic frame structure comprises a lower floor frame, an upper roof frame and vertical supports, more particularly four such supports along vertical edges of the frame structure which connect the floor and roof frames to one another. The preferably rectangular floor frame is formed from horizontal main floor profiles, which are connected detachably to one another. The preferably rectangular roof frame is accordingly formed from horizontal main roof profiles, which are connected detachably to one another. Main floor profile and main roof profile can also be termed floor support and roof support respectively, whilst the vertical supports or support profiles can be termed vertical supports. 
         [0012]    The vertically arranged support profiles connect the floor frame to the roof frame in a parallel arrangement at a vertical distance from one another, by means of a detachable connection. A rigid connection between the two frames is preferably formed by means of the support profiles. The support profiles are designed and arranged so that when stacking two or more frame structures, or when stacking two housing units, each comprising one such frame structure, one additionally stacked frame structure or housing unit is mainly supported by means of the vertical support profiles. In other words, the supporting of an upper frame structure is essentially undertaken by means of the support profiles of the lower frame structure only. The load distribution is thus undertaken hardly or even not at all, for example, by way of wall elements, which complete the housing unit, but which themselves do not have to take up or transfer any forces. 
         [0013]    Each support profile forms a floor corner connection by means of the adjoining main floor profiles of the floor frame, and a roof corner connection by means of the adjoining main roof profiles of the roof frame. These corner connections not only play an important role in the connection of the horizontal and vertical main supports, i.e. the main frame profiles, the main roof profiles and the support profiles. But they also form the fixing points, by way of example during lifting by means of a crane. Several housing units or frame structures can also be connected securely to one another or fixed to each other at their corners. Furthermore, in advantageous embodiments, the inlet and outlet points for rainwater are located at these corners. 
         [0014]    At least one of the main floor profiles, main roof profiles and/or support profiles is a hollow profile of metal that has a longitudinal structure extending along the longitudinal direction of the profile and originating from an outer profile surface, said longitudinal structure being formed as a longitudinal elevation or longitudinal indentation, or longitudinal groove, and having at its origin on the outer profile surface, transverse to the longitudinal direction of the profile, a width of less than 20, 15 or 10 millimeters. The hollow profile can have, in part or in whole, a round, circular, oval, square, rectangular and/or polygonal cross section. That the longitudinal structure is formed starting from an outer profile surface means that it projects inwards or outwards, geometrically considered, from a periphery of the cross section of the hollow profile. The longitudinal structure originates at the periphery of the cross section and has along the periphery, and thus transversely or perpendicular to the longitudinal direction of the profile, a maximum extension of 10, 15, or 25 millimeters. If the longitudinal structure projects inwards from the origin along the periphery of the hollow profile cross section, it is a longitudinal indentation, or longitudinal groove, thus a groove that extends along the longitudinal direction of the profile. On the other hand, it is said to be a longitudinal elevation, thus an elevation of the hollow profile along the longitudinal direction of the profile, when the longitudinal structure projects outwards from its origin on the periphery of the hollow profile cross section. 
         [0015]    The longitudinal structures dealt with here moreover each have a height, thus an extension perpendicular to the surface of the hollow profile measured from the origin or from the periphery of the hollow profile cross section inwards or outwards, of at least 5, 10, 15, 20 or 25 millimeters or more. This means that the longitudinal structure projects at least by as much as this height from the periphery of the cross section of the hollow profile, inwards in the case of a longitudinal groove, or outwards in the case of a longitudinal elevation. 
         [0016]    The longitudinal structure creates mounting opportunities for detachable connections of elements with the hollow profile. In particular, the floor corner connection and/or the roof corner connection can be formed by means of the longitudinal structure. A longitudinal structure in the form of a longitudinal elevation on the support profile can serve as a contact-bearing surface for placing the main floor profile and/or the main roof profile during assembly. The longitudinal elevation can furthermore allow a bore to be made through the same in order to form a screw connection between the profiles that are to be connected to one another. 
         [0017]    Additional elements and connection parts can be provided as part of the floor corner connection and/or roof corner connection. In special embodiments, stacking elements or stacking plates are provided which close off the support profiles at the top and/or at the bottom. They form bearing surfaces in order to spread the load of frame structures or housing units stacked one on top of the other to the relevant support profiles which are located underneath. Furthermore, reinforcing elements can be provided in the form of reinforcing inserts or reinforcing sleeves, which are pushed into hollow profiles at the connections as guide elements both in order to facilitate the assembly and also to stabilize the connections themselves. 
         [0018]    Angle elements and fastening brackets can also be provided in order to strengthen the floor corner connection and/or the roof corner connection. By way of example, a fastening bracket of this type at a corner connection can fix exclusively or additionally two main floor profiles or two main roof profiles that abut the support profile. 
         [0019]    The hollow profile with the longitudinal structure can be formed in low-priced embodiments from an extruded aluminum profile. Using the method of extrusion allows very complicated profile structures to be made in practically any length. 
         [0020]    In order, however, to produce hollow profiles with higher stability and bearing strength, it is advantageous to make these from sheet metal, more particularly from steel sheet. For this, the hollow profile with the longitudinal structure is formed from a one-, two-, or several-piece(d) metal sheet, preferably steel sheet, which is bent and is welded along the longitudinal direction of the profile, wherein the longitudinal structure originating from the outer profile surface is formed by means of bending. Instead of welding, other methods of connection can also be used as an alternative to close the bent sheet metal along the longitudinal direction of the profile, so that a hollow profile is formed. The sheet metal preferably has a thickness of at least 1, 2, 3 or 4 millimeters; however, the preferable thickness of the sheet metal is between 2 and 5 millimeters. 
         [0021]    Welding the bent sheet metal along the longitudinal direction of the profile can considerably increase the bending resistance and strength of the profile, particularly in the event of pressure along the longitudinal direction of the profile. 
         [0022]    The bending of the sheet metal can be carried out in the case of simple profile structures by means of a break press. However, the hollow profiles having complex longitudinal structures, which herein are advantageously utilized exclusively, are necessarily manufactured by means of roll profiling or with other suitable methods. The roll forming or cold roll forming of profiles, a continuous bending process in which strips of sheet metal are gradually formed by a number of pairs of rollers into the desired cross section, makes it possible to produce hollow profiles with longitudinal structures of practically any length, as explained above and in the following. The profiles with longitudinal structures explained above can be produced by means of roll forming at a considerably higher speed and thus with a considerably higher throughput than with press braking. By way of example, a complete set of profiles for a frame structure, comprising support, floor and main roof profiles as well as secondary profiles, can be produced within 5 to 10 minutes. These profiles can then be fitted and/or screwed together to form a frame structure within one or two hours. The assembly of conventional office containers, wherein the profiles have to be connected by welding, can take up to 6 to 8 work hours. 
         [0023]    The longitudinal structure in the form of a longitudinal elevation can involve folding, doubling or rebating the metal sheet. In this case, the width of the longitudinal structure at its origin is only approximately double the thickness of the metal sheet, and the metal on one side of the fold contacts the metal on the other side of the fold. Such a fold, or longitudinal elevation, in which a distance between the two metal sides of the longitudinal elevation is in the millimeter region, can, for example, be easily drilled through in order to enable a screw connection, which can be placed anywhere along the longitudinal direction of the profile. 
         [0024]    When viewing the cross section of the hollow profile, the longitudinal structure preferably has a finger-shaped, triangular-, rectangular-, square-, T-shaped, dovetail-shaped or circular-shaped cross-section. The longitudinal structure preferably gradually widens out from where it originates. This means that the longitudinal structure has along the periphery of the hollow profile a smaller width (equal to the width at its origin) than farther away from the periphery. This is particularly advantageous in the case of a longitudinal groove, which can then receive a sliding block or slot nut that can be moved in any way in the longitudinal groove along the longitudinal direction of the profile. If the slot nut has a threaded bore, a screw connection can hereby be produced which can be placed variably along the longitudinal direction of the groove. In other words, the longitudinal structure of the hollow profile is presented in such embodiments as a longitudinal groove into which a slot nut with an internal thread is placed, wherein a screw connection is formed by means of the sliding nut, by means of which screw connection one of the main floor profiles, main roof profiles and/or support profiles is detachably connected to another of the main floor profiles, main roof profiles and/or support main profiles. As described in the following, a screw connection of this kind can also serve to fasten other elements, such as secondary floor profiles or secondary roof profiles, onto the main floor profiles and/or main roof profiles, respectively. 
         [0025]    As explained previously in connection with the support profile, in an expedient embodiment it is intended that, as a longitudinal elevation or longitudinal groove, the longitudinal structure of the hollow profile is formed in such a way that it forms a guide edge for positioning a section of one of the main floor profiles, main roof profiles and/or support profiles. The guide edge, which extends along the longitudinal direction of the profile, can hereby be formed on a first main floor profile, main roof profile and/or support profile in order to enable the guided positioning of a second profile which is to be connected to the first profile. This guide edge supports and assists the secure connection and serves, furthermore, as a guide element when arranging the profiles that are to be connected. 
         [0026]    It is especially preferred that the hollow profile has two longitudinal structures which are formed as longitudinal elevations and which form between them a longitudinal channel, more particularly a C- or U-shaped longitudinal channel. In certain embodiments, the longitudinal channel receives in the frame structure a section of an additional profile. By way of example, the longitudinal channel can be formed on the support profile and receive the end or the side of a floor and/or main roof profile. Alternatively, or additionally, the longitudinal channel can be formed as a rain gutter and/or drainage channel. Finally, the longitudinal channel can in advantageous embodiments serve to receive wall, floor or roof elements. A C- or U-shaped longitudinal channel can also be formed by means of only one longitudinal elevation in the present sense, which forms one boundary of the longitudinal channel. In this case, the further boundary of the longitudinal channel is formed by means of an angled edge, by way of example a 90-degree angled edge. 
         [0027]    The hollow profile can, according to requirements in advantageous embodiments, have at least two, three, four or five longitudinal structures, which are each formed as a longitudinal elevation or longitudinal groove. By way of example, the support profiles can have four longitudinal elevations which each form in pairs a longitudinal channel for guiding the floor and main roof profiles. The main floor profiles can, in turn, have, by way of example, two triangular or T-shaped longitudinal grooves, in which slot nuts with threaded bores are arranged, as well as one longitudinal channel for receiving wall elements and one longitudinal indentation, or longitudinal groove, for receiving floor elements. Finally, the main roof profiles can each have one or two longitudinal grooves in which slot nuts with threaded bores are arranged, one longitudinal channel for receiving wall elements and one longitudinal channel lying opposite this for a rain gutter, and each can have one longitudinal elevation in the form of a fold for holding a roof element. 
         [0028]    In preferred embodiments of the frame structure, the housing unit and the assembly kit, respectively, the main floor profiles each have one or two longitudinal grooves and one or two longitudinal elevations, the main roof profiles each have one or two longitudinal grooves and one or two longitudinal elevations, and the support profiles each have two, three or four longitudinal elevations. 
         [0029]    In a further advantageous embodiment, it is proposed that secondary floor profiles which are each arranged between two parallel main floor profiles and are connected detachably to the two parallel main floor profiles, and/or secondary roof profiles which are each arranged between two parallel main roof profiles and are connected detachably to the two parallel main roof profiles, wherein the secondary floor profiles are supported or mounted by means of the longitudinal structures of the main floor profiles and/or the secondary roof profiles are supported or mounted by means of longitudinal structures of the main roof profiles. The secondary roof profiles form a part of the roof frame and provide horizontal reinforcement. Furthermore, they offer additional bearing surfaces for roof elements or for a roof cladding, which can be mounted hereon, in order to close the housing unit at the top. Similarly, the secondary floor profiles form a part of the floor frame and provide horizontal reinforcement. Floor elements can be arranged on the secondary floor profiles in order to close the housing unit at the bottom and to make the interior space accessible. If the ground surface of the frame structure or housing unit is rectangular, that is, if two of the main floor profiles and main roof profiles respectively are longer than the other two, then the secondary floor profiles and secondary floor profiles respectively are preferably mounted on the longer main floor profiles and main roof profiles, respectively. 
         [0030]    According to an expedient configuration, it is proposed that the longitudinal structure of the hollow profile is formed as a longitudinal groove in which a slot nut with an inner thread is arranged, wherein by means of the slot nut a screw connection is formed by means of which the secondary profiles are connected detachably to the main floor profiles and/or main roof profiles. The longitudinal groove is thus formed on one or more of the main floor profiles and/or main roof profiles, preferably along the longer main floor profiles and main roof profiles, respectively. More expediently, the hollow profile has two longitudinal grooves running parallel side by side and which can be used to fix the secondary profile more securely on the hollow profile by means of two screw connections. 
         [0031]    In a preferred embodiment, it is proposed that the longitudinal structure of the hollow profile is designed as a longitudinal groove in which a holding section or insert element of the secondary profiles engages in order to form slot-in connections between the hollow profile and the secondary profiles. 
         [0032]    In a simple configuration, the secondary floor profiles are formed as open C- or I-profiles. It is particularly preferred, however, that the secondary floor profiles are each formed as a hollow profile from a metal sheet, preferably steel sheet, bent in one piece, two pieces or several pieces. The sheet metal can preferably be welded along the longitudinal direction of the profile in order to offer a robust hollow profile structure. The secondary floor profiles can be fixed to the main floor or roof profiles by means of screw connections. Alternatively or additionally, a section or an insert element of a secondary floor profile can engage in a longitudinal groove of the main floor or roof profile, respectively, preferably with a form-fitting engagement so that a slot-in or clamping connection is produced. 
         [0033]    The metallic frame structure described herein in all its possible embodiments can be used to form a container-like, modular and mobile housing unit, more particularly a residential container, an office container or a room module. For this, wall elements, roof elements and floor elements are positioned on the frame structure and, together with the frame structure, enclose an interior area of the housing unit. The wall elements, roof elements and/or floor elements can have, in particular, thermal insulation means and they can preferably be fire-resistant. Furthermore, one or more of these elements can have openings for doors, windows, ventilation and the like. 
         [0034]    In a preferred embodiment, it is proposed that the wall elements, roof elements and/or floor elements are each positioned on longitudinal elevations and/or in longitudinal grooves of the main floor profiles, main roof profiles and/or support profiles. Preferably, some or all of the main floor profiles, some or all of the main roof profiles and/or some or all of the support profiles have on their sides, facing away from the interior of the housing unit, folded rebates which run parallel to the wall elements, roof elements and/or floor elements and thus cover the supporting edges or joints of these elements on the associated profiles. 
         [0035]    The metallic frame structure or the container-like, modular and mobile housing unit with the frame structure is preferably supplied in the form of an assembly kit. This assembly kit thus comprises the main floor and roof profiles either separately or with floor frame or roof frame preassembled, as well as the support profiles. The assembly kit can be stored and easily transported in a space-saving manner in a collapsed state. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0036]    The invention will now be explained below by means of exemplary embodiments with reference to the drawings. These show: 
           [0037]      FIG. 1  a perspective view of the frame structure according to a preferred embodiment; 
           [0038]      FIG. 2  an exploded view of the frame structure of  FIG. 1 ; 
           [0039]      FIG. 3  a floor corner connection of a frame structure with wall and floor elements and a secondary floor profile, according to a preferred embodiment; 
           [0040]      FIG. 4  an exploded partial view of the floor corner connection of  FIG. 3  without wall and floor elements and secondary floor profile; 
           [0041]      FIG. 5  a roof corner connection of a frame structure with wall and roof elements and a secondary roof profile, according to a preferred embodiment; 
           [0042]      FIG. 6  an exploded partial view of the roof corner connection of  FIG. 5  without wall and roof elements and secondary roof profile; 
           [0043]      FIG. 7  a floor or main roof profile and an associated secondary profile; 
           [0044]      FIG. 8  the profiles of  FIG. 7  which are connected by means of a slot-in connection; 
           [0045]      FIG. 9  different preferred configurations of a support profile in a cross-sectional view; 
           [0046]      FIG. 10  different preferred configurations of a main roof profile in a cross-sectional view; 
           [0047]      FIG. 11  different preferred configurations of a main floor profile in a cross-sectional view; 
           [0048]      FIG. 12  different preferred configurations of floor or main roof profiles, which are suitable for slot-in connections, in a cross-sectional view; and 
           [0049]      FIG. 13  a cross section of an imaginary hollow profile for illustrating and explaining different longitudinal structure designs. 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0050]      FIG. 1  shows a perspective view of a frame structure for a mobile housing unit, more particularly for an office container, a residential container or a room module. The frame structure has a box-like construction with a floor frame and a roof frame that are connected to one another by way of the support profiles  3 . The floor frame is formed from four main floor profiles  1 , connected to one another by the support profiles  3 , and from a number of secondary floor profiles  41  that are arranged between and mounted on the two longer main floor profiles  1 . Four main roof profiles  2  connected to one another by way of the support profiles  3 , and a number of secondary roof profiles  42  form the roof frame in a similar way. 
         [0051]    The main floor profiles  1  are connected detachably to the support profiles  3  at floor corner connections, whilst the main roof profiles  2  are connected to the support profiles  3  at roof corner connections. These corner connections form essential elements of the present frame structure and will be explained more precisely below. Furthermore, several lift and holding bores  51  are provided at the corners of the frame structure and these bores serve to connect the frame structure to one or more additional frame structures. An additional frame structure can be stacked, by way of example, on top of the frame structure. The load of the additional frame structure is hereby preferably taken up, in essence, entirely by the four support profiles  3  of the frame structure, so that no vertical force presses on the main floor profiles  1  or the main roof profiles  2  as a result of stacking. The frame structure of  FIG. 1  can be completed with wall, roof and floor elements in order to form the completed housing unit. 
         [0052]      FIG. 2  is an exploded view of the frame structure of  FIG. 1 . Here it can be seen that the support profiles  3  are each closed on each side with stacking plates  31 . A stacking plate  31  serves on the one hand to protect the inside of the associated support profile  3  from dirt and water. In addition, it offers a bearing surface for a further frame structure stacked on top of the frame structure. Furthermore, in  FIG. 2  reinforcing sleeves  32  are shown which are inserted at the ends of the main floor profiles  1  and the main roof profiles  2  into the main floor profiles  1  and into the main roof profiles  2 , respectively, and thus reinforce the respective corner connection. 
         [0053]    As can be seen from  FIGS. 1 and 2 , the secondary floor profiles  41  and the secondary roof profiles  42  are I-profiles, also called double-T-supports or double-T-profiles. Alternatively, other types of profiles can also be used, more particularly profiles of sheet metal, preferably of steel sheet, which is bent and welded preferably along a longitudinal direction to form hollow profiles. 
         [0054]    One possible implementation of a floor corner connection is shown in  FIGS. 3 and 4 , wherein  FIG. 3  is a three-dimensional sectional drawing, and  FIG. 4  is an exploded illustration of the floor corner connection. The connection of two main floor profiles  11 ,  12  which meet at the support profile  3  is formed by way of the support profile  3 . The main floor profiles  11 ,  12  are comprised of a long main floor profile  11  extending along the length of the frame structure and a short main floor profile  12  of the floor frame extending along the width of the frame structure. Achieved by means of bending, the support profile  3  exhibits a substantially box-shaped cross section and four longitudinal structures  74 ,  75  in the form of folds, or rebates, of the metal sheet. Each of two longitudinal structures  74 ,  75  form the boundaries of a longitudinal channel  82  along the profile longitudinal direction of the support profile  3 . The front ends of the main floor profiles  11 ,  12  are inserted into these longitudinal channels  82  and fixed by means of screws. The screws are hereby pushed through bores in the longitudinal structures  74 ,  75 . The front ends of the main floor profiles  11 ,  12  adjoining the support profile  3  are reinforced by means of inserted reinforcing sleeves  32  in order to avoid any undesired profile bending there. The support profile  3  is closed at the bottom by a stacking plate  31 , which also offers a guide-positioning surface for the ends of the main floor profiles  11 ,  12 . 
         [0055]    The two main floor profiles  11 ,  12  have substantially the same cross sections. Their cross sections are rectangular and each has four longitudinal structures  71 ,  72 ,  73 . Two of the longitudinal structures  71  are designed as longitudinal grooves with T-shaped cross sections, with a narrow neck at their origin at the outer surface of the profile, and an expansion extending from there into the inner region of the hollow profile. Slot nuts with internally threaded bores that are capable of receiving screws are inserted into these longitudinal grooves  71 . They serve on the one hand to connect the two main floor profiles  11 ,  12  directly to one another in the region of the floor corner connection by means of a corner fixing element  52 , and at the same time to press these against the support profile  3 . The floor corner connection is thus secured and strengthened by means of the corner fixing element  52 , which extends across the support profile  3  between the two main floor profiles  11 ,  12 . 
         [0056]    Furthermore, the two parallel longitudinal structures  71  with the slot nuts arranged therein offer the possibility of arranging secondary floor profiles  41 , distributed along the longitudinal direction of the profile, and of fixing them to the main floor profile  1 ,  11 . In the embodiment according to  FIGS. 3 and 4  this is achieved for each secondary floor profile  41  by means of an angle fixing element  53 , which is screwed, riveted, welded or fixed in another way on the secondary floor profile  41 , and is screwed onto slot nuts in the longitudinal structures  71 . The secondary floor profiles  41 , of which only one is shown in  FIGS. 3 and 4 , are here fixed on the long main floor profile  11 . 
         [0057]    An additional longitudinal structure  72  in the form of a longitudinal groove is arranged underneath the two aforementioned longitudinal structures  71  and receives an edge of a floor cladding  61 , which closes the housing unit at the bottom. The floor cladding  61  comprises several segments, each of which rests on the lower horizontal surface of adjacent secondary floor profiles  41 . Insulation elements  64  are arranged on the floor cladding  61  and are inserted in recesses of the secondary floor profiles  41 . Finally, a floor element  63  is provided as the ground floor of the housing unit. The floor element  63  lies on the upper edges of the main floor profiles  11 ,  12  and the secondary floor profiles  41 . 
         [0058]    An additional longitudinal structure  73  protrudes at the outer edges of the main floor profiles  11 ,  12 . This longitudinal structure  73  forms a boundary of a longitudinal channel  81  along each main floor profile  11 ,  12  and serves to receive the wall elements  62 . The wall elements are thus framed all around on their outside surfaces facing away from the interior of the housing unit by outer longitudinal structures  73 ,  75  which are formed as folds on the main floor profiles  11 ,  12  and the support profile  3 . The floor cladding  61 , the wall elements  62 , the floor element  63  and the insulation element  64  of  FIG. 3  are not shown in the exploded view of the frame structure in  FIG. 4  for reasons of clarity. 
         [0059]    The roof corner connection corresponding to  FIGS. 3 and 4  is shown in  FIGS. 5 and 6  as a three-dimensional sectional drawing in  FIG. 5  and as an exploded view in  FIG. 6 . This is hereby the same support profile  3  as shown in  FIGS. 3 and 4 . This is likewise closed at the top by means of a stacking plate  31 . In  FIGS. 5 and 6  lift and holding bores  51  are moreover visible in the stacking plate  31  and in the support profile  3  and can be used to connect together several frame structures which are arranged side by side and/or stacked one above the other. 
         [0060]    End faces of two main roof profiles  21 ,  22  are now inserted and fixed by means of screws in the two longitudinal channels  82  formed by means of the longitudinal structures  74 ,  75  along the support profile  3 , in a similar way to the main floor profiles  11 ,  12 . The long main roof profile  21  and the short main roof profile  22  are configured in their cross section similar to the main floor profiles  11 ,  12  of  FIGS. 3 and 5 . They likewise have two parallel longitudinal structures  71  in the form of longitudinal grooves suitable for receiving slot nuts, and their adjoinment to the support profile  3  is likewise strengthened by means of reinforcing sleeves  32  and a corner fixing element  52 , which is, however, not shown in  FIG. 5  for reasons of clarity. 
         [0061]    The longitudinal structure  73  at the outer upper edges of the main roof profiles  21 ,  22  likewise fulfills a similar function, as in the case of the main floor profiles  11 ,  12 , in that they each form an outer boundary of a longitudinal channel  81 . However, unlike the longitudinal channels  81  in the main floor profiles  11 ,  12 , the longitudinal channels  81  in the main roof profiles  21 ,  22  do not serve to receive wall elements, but preferably serve as rain gutters or as drainage channels. The support profile  3  has, accordingly, at the upper end of the extension of the longitudinal channels  81  recesses through which rainwater or waste water can flow out and then down from the longitudinal channels  81  into the hollow profile of the support profile  3 . 
         [0062]    A secondary roof profile  42 , a roof interior cladding  65 , a further insulation element  64  and a roof element  66  and roof outside cladding  66 , respectively, are shown attached in the upper region of the housing unit to the main roof profiles  21 ,  22 , corresponding to the arrangement of the secondary floor profile  41 , the floor element  63 , the insulation element  64  and the floor cladding  61  in the lower region of the frame structure on the main floor profiles  11 ,  12 . The outside roof cladding  66  is hereby folded over a longitudinal structure  76 , which is in the form of a fold or a rebate, which is inclined towards the longitudinal channel  81 . In this way, it is ensured that the roof outside cladding  66  is spanned over the interior space of the housing unit and prevents the penetration of rainwater. Thus, rain water striking the roof outside cladding  66 , or melting water from snow lying on the outside roof cladding  66 , is directed into the longitudinal channels  81 , serving as rain gutters, and from there into the support profiles  3 . The longitudinal structure  76  is hereby inclined in the direction of the longitudinal channel  81  in order to facilitate the flow of water from the roof outside cladding  66  into the longitudinal channel  81 . 
         [0063]    Furthermore, the main roof profiles  21 ,  22  each have along their outer side, facing away from the interior space of the housing unit, a further longitudinal structure  77  extending downwards in the form of a fold. This serves as a contact-bearing surface of the wall elements  62  and, together with the longitudinal structures  73  of the main floor profiles  11 ,  12  and the outer longitudinal structures  77  of the support profile  3 , makes up the peripheral frame of the wall element  62  explained above. 
         [0064]    The longitudinal structures furthermore increase the bending resistance of the main roof profiles  21 ,  22 . Other longitudinal structures of the main roof profiles  21 ,  22 , shown in  FIGS. 5 and 6 , serve to further increase the bending resistance. 
         [0065]      FIGS. 7 and 8  illustrate an alternative connection possibility for fixing a secondary floor profile  41  on a main floor profile  1  or a secondary roof profile  42  on a main roof profile  2 . For this, the corresponding main profile  1 ,  2  has one insert groove instead of two longitudinal grooves, in which slot nuts with threaded bores can be inserted. This involves, by way of example as shown in  FIGS. 7 and 8 , a longitudinal structure  78  in the form of a narrow longitudinal groove which, in the present case, is formed directly adjacent to a fold  78 ′. The secondary profile  41 ,  42  has, accordingly, one insert element  411 . If the insert element  411  is inserted into the longitudinal groove, it engages around the fold  78 ′. The insert element  411  can itself be a fold of metal sheet, or, as shown in  FIGS. 7 and 8 , a simple, thus not double-folded, sheet metal section. 
         [0066]    The secondary profile  41 ,  42  is folded here from a metal sheet and has an open cross section compared to a hollow profile. It is a C-shaped profile. The main profile  1 ,  2  furthermore has a longitudinal structure  79  in the form of a protrusion on which a lower bearing surface  412  of the secondary profile  41 ,  42  rests and is supported. 
         [0067]    By means of the roll forming method, a number of different hollow profiles with, in part, very complicated structures can be produced from steel sheet. The cross sections of some of such hollow profiles, which can be used as support profiles  3 , main floor profiles  1 ,  11 ,  12  or main roof profiles  2 ,  21 ,  22 , are illustrated in  FIGS. 9 to 12 . They each have one, two, three, four, five or more longitudinal structures, each of which could have a form as described below. 
         [0068]    A fold  91  can serve to form a boundary of a longitudinal channel, or a stop or bearing surface for positioning a further hollow profile or further structural elements, such as by way of example wall, floor or roof elements. Furthermore, a fold  91  can be easily and safely drilled through in order to fix such a structural element or a further hollow profile by means of screws. 
         [0069]    The same functions as the fold  91  can be met by a projection  94 . This can hereby be an elevation with uniform width, measured perpendicular to the longitudinal direction of the profile, wherein, however, this width is greater than double the thickness of the metal plate. In other words, the two sections of the metal plate bent onto one another do not lie directly on one another, as in the case of the fold, but exhibit a space between them, which can remain empty or be filled with a material, by way of example, with an insulation material. In all embodiments, a projection  94  can be used in place of a fold  91 , or vice versa. 
         [0070]    Furthermore, an inwardly widening groove  92  can be provided, thus a groove which has at the origin along the periphery of the hollow profile cross section a smaller width than at a certain distance closer to the inner region of the hollow profile. The widening groove  92  can hereby have a dovetailed cross section according to  FIG. 11   f ), a round or circular cross section according to  FIG. 11   g ), a diamond- or tilted-block-shaped cross section according to  FIG. 11   i ), a T-shaped cross section according to one of  FIG. 11   b ),  11   c ),  11   d ) or  11   e ), or a differently shaped cross section. 
         [0071]    An insert groove  93  is kept sufficiently narrow in order to receive a close-fitting plate element, a sheet metal plate section or a fold section, as far as possible without any play, perpendicular to the groove width. An element of this kind or a section of this kind is preferably held in the insert groove  93  by means of clamping. 
         [0072]    A bent fold  95  is a fold in which the two metal plate sections lying one on the other are again bent or curved together. Alternatively, the bent fold  95  can also be angled only in the region folded together. Expressed differently, a bent fold  95  can be a fold which does not protrude perpendicular from the surface of the hollow profile. 
         [0073]      FIGS. 9   a ),  9   b ),  9   c ) and  9   d ) each show cross sections of different advantageous support profiles. Different preferred configurations of a main roof profile are on the other hand shown in cross-sectional view in  FIGS. 10   a ),  10   b ),  10   c ) and  10   d ).  FIGS. 11   a ),  11   b ),  11   c ),  11   d ),  11   e ),  11   f ),  11   g ) and  11   i ) in turn show cross-sectional views of preferred embodiments for a main floor profile. Finally,  FIGS. 12   a ),  12   b ) and  12   c ) show different embodiments of a main floor profile and  FIGS. 12   d ) and  12   e ) show different embodiments of a main roof profile, wherein the main floor profiles and the main roof profiles according to  FIGS. 12   a ) to  12   e ) are characterized in that they each have at least one vertical insert groove  93  in which corresponding sections of a secondary profile can be inserted and can thus be fixed purely by a slot-in connection without screws or welding. The profile in  FIG. 12   c ) has, additionally, one further vertical insert groove  93 . 
         [0074]      FIG. 13  uses the cross section of an imaginary hollow profile to define the origin of a longitudinal structure and its width. The illustrated hollow profile has, in total, six different longitudinal structures, wherein their relevant widths at origin are indicated by means of arrowheads. They are hereby, from top to bottom, a T-shaped longitudinal groove  92 , a longitudinal groove or insert groove  93  of uniform width, a projection  94 , a fold  91 , a dovetail-shaped longitudinal groove  922  and a bent or curved fold  95 . It is this attachment width, measured along the periphery of the cross section of the hollow profile that must have a maximum value of 20, 15 or 10 millimeters. Structures of this kind cannot usually be achieved by means of press braking techniques. For this, instead, profile manufacturing methods have to be used, such as extrusion molding for aluminum or similar materials and roll forming processes in the case of sheet metal, more particularly in the case of steel sheet metal. 
       LIST OF REFERENCE NUMERALS 
       [0000]    
       
           1  Main floor profile 
           11  Long main floor profile 
           12  Short main floor profile 
           2  Main roof profile 
           21  Long main roof profile 
           22  Short main roof profile 
           3  Support profile 
           31  Stacking plate 
           32  Reinforcing sleeve 
           41  Secondary floor profile 
           411  Insert element 
           412  Bearing surface 
           42  Secondary roof profile 
           51  Lift and holding bores 
           52  Corner fixing element 
           53  Angle fixing element 
           61  Floor cladding 
           62  Wall element 
           63  Floor element 
           64  Insulation element 
           65  Roof inner cladding 
           66  Roof element, roof outer cladding 
           71 ,  72 ,  73 , . . . Longitudinal structures 
           81 ,  82 , . . . Longitudinal channels 
           91 ,  92 ,  93 ,  94 ,  95 ,  921 ,  922  Special longitudinal structure cross sections