Prefabricated Roof Plate Element and Method for its Production

Abstract

A prefabricated roof plate element (6) of the type comprising load-carrying girders in the form of longitudinal upper and lower steel frame parts placed at opposed sides of the roof plate element and corrugated at opposing upper and lower sides in longitudinal direction, where vertical side walls of said steel frame parts are interconnected by longitudinal connection plates (36) that form parts of said load carrying girders; and that said lower steel frame parts (4) furthermore are interconnected by an integral steel panel part (8) that forms the bottom of said roof plate element (6) and a ceiling of a building, respectively. The prefabricated roof plate element (6) is interconnected to other prefabricated roof plate elements (6) in a side-by-side manner to form a wider pre-fabricated roof plate element, the cavities of which are filled with insulation material, and are provided with a common top plate construction (70, 72) and a common roof foil covering (74).

1 - 11 . (canceled) 
     
     
         12 . A method for production of a prefabricated load-carrying girder comprising the steps of:
 (a) providing two straight steel blanks;   (b) bending the two straight steel blanks at a profile press station into upper and lower corrugated frame profiles having respectively upper and lower corrugations;   (c) providing two rigid connection plates and a semi-hard plate-shaped insulation material;   (d) assembling the rigid connection plates at both sides of a semi-hard plate-shaped insulation material with the upper and lower corrugated frame profiles into an assembled load-carrying girder member by gluing;   (e) hardening the assembled load-carrying girder member at a hardening station; and   (f) cutting the assembled load-carrying girder member at a cutting station to a predetermined length, whereby the load-carrying girder member is produced.   
     
     
         13 . The method for production of a prefabricated load-carrying girder according to  claim 12 , wherein the rigid connection plates consist of a composite material reinforced with layers of glass fibre netting. 
     
     
         14 . The method for production of a prefabricated load-carrying girder according to  claim 12 , wherein the steps (e) and (f) are performed along a roller conveyor. 
     
     
         15 . The method for production of a prefabricated load-carrying girder according to  claim 12 , wherein steps (a) to (f) are performed along a roller conveyor. 
     
     
         16 . The method for production of a prefabricated load-carrying girder according to  claim 12 , wherein in step (d) the semi-hard plate-shaped insulation material is engaged in the upper and lower corrugations of the respective upper and lower corrugated frame profiles. 
     
     
         17 . The method for production of a prefabricated load-carrying girder according to  claim 12 , wherein steps (a) to (f) are performed in-situ. 
     
     
         18 . A method for production of a prefabricated roof plate element comprising the steps of:
 producing a plurality of prefabricated load-carrying girders according to  claim 12 , and   interconnecting at least two of the plurality of prefabricated load-carrying girders with a lower bottom plate member, thereby forming a hollowness between the load-carrying girders.   
     
     
         19 . The method for production of a prefabricated roof plate element according to  claim 18 , including a step of filling the hollowness with an insulation material. 
     
     
         20 . A load-bearing girder for use in making a roofing plate element, said girder comprising:
 a steel upper frame member providing a corrugated top wall and a downwardly-extending outer side panel, a steel lower frame part providing a corrugated bottom wall and an upwardly-extending outer side panel, and two structural plate members extending between aligned and facing corrugations in the top wall and the bottom wall.   
     
     
         21 . The load-bearing girder according to  claim 20 , wherein a first of said two structural plate members is connected to the downwardly-extending outer side panel and to the upwardly-extending outer side panel. 
     
     
         22 . The load-bearing girder according to  claim 21 , wherein the steel upper frame member provides a downwardly-extending inner side panel, the steel lower frame part provides an upwardly-extending inner side panel, and a second of said two structural plate members is connected to the downwardly-extending inner side panel and to the upwardly-extending inner side panel. 
     
     
         23 . The load-bearing girder according to  claim 22 , including insulation material between the first and second plate members. 
     
     
         24 . The load-bearing girder according to  claim 20 , wherein each of the structural plate members is substantially flat.