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).

Description

FIELD OF INVENTION

The present invention relates to a prefabricated roof plate element of the type indicated in the preamble to claim 1.

The invention also relates to a prefabricated load carrying girder preferably for use in prefabricated roof plate elements according to the invention.

Furthermore, the invention relates to a method for the production of prefabricated roof plate elements according to the invention.

BACKGROUND OF THE INVENTION

Prefabricated roof girders and roof plate elements, respectively, of this kind can be made totally from inorganic materials, which is very significant to durability and maintenance. Besides, it is of great significance that the roof plate elements in question can have a free span of up to 22 metres, i.e. one single roof plate element may cover in the order of about 80 m², which of course is very essential with regard to reducing of the construction time and costs.

EP2145056A1 (WO2008/125109A1) discloses a prefabricated roof plate element, including one or more longitudinal box-shaped roof girders that each consists of two predominantly U-shaped steel sections which at mutually facing, open sides are interconnected along narrow outwards bent lateral edges, the roof girders being connected at upper and lower narrow sides corrugated in longitudinal direction with steel plates corrugated in transverse direction and having approximately the same width as the roof plate element, the roof girders/support girders and roof plate element, respectively, designed with reduced height at an end part intended to form eaves.

WO2012/113406A discloses a roof girder consisting of two predominantly U-shaped steel sections, the lower and upper sides of which face each other, and which is designed with narrow outwardly bent edges, the roof girder at opposing upper and lower narrow sides are corrugated in longitudinal direction, wherein the steel sections at the upper and lower open sides, respectively, are interconnected by means of connecting plates or partitionings which are fastened to substantial, substantially vertical sides of the steel sections in such a way that there is a spacing between the narrow outwardly bent edges of respective lower and upper steel sections.

OBJECT OF THE INVENTION

On that background it is the purpose of the invention to provide a new and improved prefabricated plate-shaped roof element of the type indicated in the preamble to claim 1 and by which may be provided both cheaper and improved plate-shaped roof elements.

DESCRIPTION OF THE INVENTION

The prefabricated roof plate element according to the invention is characterised in, that vertical side walls of said steel frame parts being interconnected by longitudinal connection plates forming parts of said load carrying girders, and that said lower steel frame parts furthermore preferably being interconnected by an integral steel panel part forming the bottom of said roof plate element and a ceiling of a building, respectively. By simple provisions is hereby achieved a new and improved prefabricated roof plate element, which furthermore may be cheaper to produce.

It shall be emphasized that the fact that said lower steel frame parts being integrated with a steel panel parts forming the bottom of said roof plate element means that the production of such roof plate elements may be carried out with a minimum of manual working hours—resulting in quicker and cheaper production and minimized prices.

The prefabricated roof plate element according to the invention may preferably be such provided that it consists of a number of such uniform roof plate elements being interconnected side by side to form a wider prefabricated roof plate element, the cavities of which being filled with insulation material, and afterwards being provided with a common top plate construction and a common roof foil covering.

Appropriately, the prefabricated roof plate element according to the invention is such provided, that said common top plate construction comprises steel panel plates provided with transverse corrugations and on top thereof semi-hard insulation plates and said common roof foil covering.

Advantageously, the prefabricated roof plate element according to the invention may be such provided, that said integral steel panel part forming the bottom of said roof plate element and a ceiling of a building, respectively, being provided with a large number of perforations and possible an upper fabric cower to improve the acoustic qualities of the bottom of said roof plate element.

Alternatively, the prefabricated roof plate element according to the invention may be such provided, that said integral steel panel part forming the bottom of said roof plate element and a ceiling of a building, respectively, being provided with transverse corrugations to improve the stiffness and carrying qualities of the bottom of said roof plate element.

Additionally, in order to improve the general stiffness and carrying capacity it may be advantageous that the prefabricated roof plate element according to the invention being such provided, that said integral steel panel part forming the bottom of said roof plate element and a ceiling of a building, respectively, being provided with longitudinal corrugations to improve the general stiffness and carrying qualities of the bottom of said roof plate element.

The invention also relates to a prefabricated load carrying girder preferably for use in prefabricated roof plate elements according to the invention, said prefabricated load carrying girder consisting of longitudinal upper and lower steel frame parts being provided with longitudinal corrugations to improve the general stiffness and carrying qualities of said load carrying girders, that vertical side walls of said upper and lower steel frame parts being interconnected by longitudinal connection plates, and that preferably plate-shaped insulation material being inserted between said longitudinal connection plates.

Hereby it becomes possible to build up plate-shaped roof elements according to the invention in situ by means of a number of prefabricated load carrying girders and by mounting said steel panel part forming the bottom of said plate-shaped roof element and a ceiling of a building, respectively. Preferable, the in situ mounted combined button and ceiling plates may be provided with longitudinal or transverse corrugations to improve the general stiffness and carrying qualities of said bottom of said plate-shaped roof element.

Afterwards, the upwardly open central hollowness of the in situ build up plate-shaped roof element is filled with a suitable insulation material, before the plate-shaped roof element is closed upwardly by means of transversely corrugated steel panels, and finally upper semi-hard insulation plates and an uppermost roof foil covering being mounted on the corrugated steel panels.

Furthermore, the invention relates to a method for the production of prefabricated roof plate elements comprising the following method steps:

a thin steel blank having a total width similar to that of the summarised partial width of the respective wall parts of a lower steel plate frame part to be bend up is continuously unrolled from a supply roll as the middle part of said thin steel blank adapted to form a central lower bottom part of said lower steel plate frame and a ceiling in a building,

opposed end parts of said steel blank being continuously bend up to form at least lower longitudinal corrugations and lower, vertical side panels,

a thin steel blank having the total width similar to that of upper steel plate side frame parts to be bend up is continuously unrolled from another supply roll,

opposed end parts of said last mentioned steel blank being continuously bend up to form at least upper longitudinal corrugation and upper, vertical side panels,

longitudinal vertical connection plate members being situated in said longitudinal corrugation and being interconnected between said upper and lower vertical side panels to form an upwardly open girder-like construction,

more of such upwardly open girder-like constructions may be interconnected side by side to create a wider roof plate element of which the upwardly open cavities are filled with insulation material,

said wider roof plate element being closed upwardly by means of transverse corrugated steel panels and on top thereof by means of common semi-hard insulation plates and a common roof foil covering.

Alternatively the method according to the invention may comprise further method steps:

a thin steel blank having a total width similar to that of the steel plate frame part to be bend up is continuously unrolled from a supply roll as the middle part of said thin steel blank adapted to form a central lower bottom part of said steel plate frame being provided with a large number of perforations, said lower bottom part at a side facing upwards being provided with an upper fabric cower to improve the acoustic qualities of the bottom of said roof plate element as well as a steam tight membrane.

According to a further alternative the inventive method could comprise further method step:

that said interconnection between said vertical side panels of the respective upper and lower steel plate frame and said longitudinal, vertical connections plate panels is carried out by one or more of the following connecting means or methods: Screws, clinching, gluing, assembling of combined sealing lips and profiles or welding.

A still further method according to the invention may comprise the further method steps:

a thin steel blank having a total width similar to that of the steel plate frame part to be bend up is continuously unrolled from a supply roll as the middle part of said thin steel blank adapted to form a central lower bottom part of said steel plate frame being provided with longitudinal corrugations to improve the free span carrying capacity of a roof plate element provided by interconnection side by side a number of such upwardly open steel plate frame parts etc.

DESCRIPTION OF THE DRAWING

The prefabricated roof plate element according to the invention is described in more details in the accompanying drawing—in which:

FIG. 1 shows a plane schematic sectional view illustrating a preferred embodiment of a method for the production of prefabricated plate-shaped roof element according to the invention may be produced,

FIG. 2 shows a plane schematic view illustrating an other embodiment of a method of the production of prefabricated plate-shaped roof element made from more side by side interconnected roof elements as shown in FIG. 1,

FIG. 3 shows a perspective view illustrating another embodiment of a method for the production of steel plate frame parts for a prefabricated plate-shaped roof element according to the invention,

FIG. 4 shows a perspective view illustrating how steel plate frame parts as shown in FIG. 2 at opposite sides being provided with a pair of longitudinal connection element members interconnecting the respective steel plate frame parts,

FIG. 5 shows a perspective view of the illustrating how the steel plate frame parts of the plate-shaped roof element as seen in FIG. 4 afterwards are filled with a block of insulating material,

FIG. 6 shows a plane sectional view of a modified embodiment plate-shaped roof element provided at opposite sides with only one longitudinal connection members between the respective steel frame parts,

FIG. 7 shows a perspective view of a rather narrow plate-shaped roof element having a cross section as that of the modified plate-shaped roof element of FIG. 6,

FIG. 8 shows a perspective view illustrating in principle an embodiment of a method for the production of steel plate frame parts for a prefabricated plate-shaped roof element similar to that of FIG. 3 according to the invention,

FIG. 9 shows a perspective view of a further embodiment of a steel plate frame for a plate-shaped roof element where the interconnections between the respective steel sections at opposite sides being provided between narrow inwardly bend edges of the steel sections,

FIG. 10 shows a perspective view of a further embodiment of a longitudinal steel plate frame for a plate-shaped roof element, where the lower plate portion being provided with longitudinal reinforcement corrugations,

FIG. 11 shows a perspective view of an enlarged end portion of the steel plate frame shown in FIG. 10,

FIG. 12 shows a perspective view of an embodiment for a narrow, longitudinal girder for a plate-shaped roof element according to the invention,

FIG. 13 shows a perspective view of a lower steel plate frame portion similar to that shown in FIG. 8,

FIG. 14 shows a perspective view of a modified embodiment for lower steel plate frame portion provided with transverse corrugations,

FIG. 15 shows a perspective view of a further modified embodiment for a lower steel plate frame portion provided with longitudinal corrugations,

FIG. 16 shows a perspective, partial view of an embodiment for a plate-shaped roof element according to the invention consisting of three assembled plate-shaped roof plate elements as seen in FIG. 5,

FIG. 17 shows a perspective, partial view of the plate-shaped roof element shown in FIG. 16 and provided with upper, transverse corrugated steel plate profiles,

FIG. 18 shows a perspective, partial view of the plate-shaped roof element shown in FIG. 17 and provided with upper semi-hard plate of insulating material,

FIG. 19 shows a perspective, partial view of the plate-shaped roof element shown in FIG. 18 and further provided with an uppermost roof folio material,

FIG. 20 shows a perspective view of the plate-shaped roof element according to the invention as shown in FIGS. 16-19—as seen from below,

FIG. 21 shows a plane sectional view through the plate-shaped roof element shown in FIGS. 16-20,

FIG. 22 shows a perspective view of the plate-shaped roof element according to the invention as shown in FIGS. 16-19—as seen from above,

FIG. 23 shows a perspective view of an enlarged end portion of the steel plate frame similar to that shown in FIG. 11 and provided with an end closing panel,

FIG. 24 shows a perspective view of an enlarged end portion of the steel plate frame similar to the lower frame portion shown in FIGS. 8 and 9,

FIG. 25 shows a perspective view of an enlarged end portion of an upper side part of the steel plate frame shown in the left hand side of FIG. 3,

FIG. 26 shows a perspective view of an enlarged end portion of an upper side part of the steel plate frame shown in the right hand side of FIG. 3,

FIG. 27 shows a perspective view of an enlarged end portion of a lower side part of the steel plate frame shown in the left hand side of FIG. 8,

FIG. 28 shows a perspective view of an enlarged end portion of an upper side part of the steel plate frame shown in the left hand side of FIG. 8,

FIG. 29 shows a perspective view of an end part of a prefabricated roof element provided with an inclined end part intended to form eaves,

FIG. 30 show a plane side view of the end part shown in FIG. 29,

FIG. 31 shows a perspective view of an end part of a prefabricated roof element provided with a reduced height at an end part intended to form eaves,

FIG. 32 shows a plane side view of the end part shown in FIG. 31,

FIG. 33 shows a perspective view of an end part of a prefabricated roof element provided with a reduced height at an end part intended to form eaves,

FIG. 34 shows a plane side view of the end part shown in FIG. 33,

FIG. 35 shows a plane sectional view of another embodiment of a plate-shaped roof element according to the invention,

FIGS. 36A-36C show plane sectional views through embodiments of carrying girders for use in plate-shaped roof elements according to the invention,

FIGS. 37A-37C show plane sectional views through further embodiments of carrying girders for use in plate-shaped roof elements according to the invention,

FIG. 38 shows a perspective view of a plant for the continuously production of load carrying girders according to the invention,

FIG. 39 shows a perspective view of an embodiment for a profile press station for bending up upper and lower steel frame profiles for load carrying girders according to the invention,

FIG. 40 shows a plane top view of the production plant shown in FIG. 38,

FIG. 41 shows a perspective view of the assembling details of the production plant shown in FIG. 38, and

FIG. 42 shows a perspective view of a cutting station of the production plant shown in FIG. 38.

DETAILED DESCRIPTION OF THE INVENTION

FIG. 1 illustrates how an embodiment of a longitudinal carrying steel frame 4 for a plate-shaped roof element 6 continuously is bended-up from a thin steel blank 2, as the latter being unrolled from a not shown supply roll.

The total width of said steel blank 2 corresponds to the summarised lengths of the respective partial wall parts of at least a longitudinal lower steel frame part 8.

From a narrow thin steel blank are upper left and right hand side plate-shaped frame parts 10 and 12 continuously bend-up, before longitudinal narrow bend-in edges 14 being interconnected with similar longitudinal narrow bend-in edges 16 of said lower steel frame part 8.

In order to prevent or reduce thermal bridges between said narrow bend-in edges 14, 16 special sealant tapes may be positioned between said narrow bend-in edges 14, 16 before said interconnection of these parts.

FIG. 2 shows a wider, lower steel frame 18 build-up by interconnecting side by side three of said lower steel frame parts 8.

According to an important aspect the building-up of the plate-shaped roof element 2 may be provided in a mobile factory arranged in one or more containers.

In order to maintain correct vapour barrier effect of such build together frame parts 8 special sealant tapes may be used between the lower external side parts of said lower frame parts 8. Such special sealant tapes may furthermore comprise electric leads for activation the adhesive effect of said special sealant tapes between said lower external side parts of the frame parts 8.

Alternatively, said longitudinal narrow bend-in edges 14, 16 may be substituted by narrow bend-out edges such that said interconnections are placed at the outside of said plate-shaped element 6 and the interior longitudinal joints would be quite plane without disturbing projecting parts such that it would be possible to make use of interior longitudinal connection plate members 36 as described by later embodiments according to the invention.

FIG. 3 shows an alternative embodiment for a longitudinal carrying steel frame 20 by which lower left and right hand side vertical side wall panels 22 and 24 are plane i.e. without the above mentioned inwardly bend narrow edges 16. In a corresponding manner upper left and right hand side steel frame parts 26 and 28 are also made with plane vertical side wall panels 30 and 32.

FIG. 4 shows how a girder-like construction 34 is made by situating longitudinal, vertical connection plate members 36 in upper and lower longitudinal corrugations 38, 40 of the respective upper and lower wall parts 42 and 44 of said longitudinal carrying steel frame 20.

Furthermore, outermost of said longitudinal connection plate members 36 are positively connected with the respective vertical side walls panels 22, 24 and 30, 32, while innermost of said longitudinal connection plate members 36 being situated in innermost upper and lower corrugations of the respective upper and lower wall parts 42 and 44 of said longitudinal carrying steel frame 20.

Furthermore, innermost narrow, vertical side wall panels 46 and 48 of said upper left and right hand side steel frame parts 28 and 30 may be positively connected along the interior upper side edges of said innermost of said longitudinal connection plate members 36.

Said positive connections between said vertical side panels of the respective upper and lower steel plate frame and said longitudinal, vertical connection plate members 36 including said interconnection of said inwardly bended short edges are carried out by one or more of the following connecting means or methods: Screws, clinching, gluing, assembling of combined sealing lips and profiles or welding.

Furthermore, FIG. 4 shows that the longitudinal narrow cavities 50 between the longitudinal connection plate members 36 are filled with a suitable insulating material. The same is the case in FIG. 5, where the central cavity 52 of the longitudinal carrying steel frame 20 is filled with a suitable insulation material.

FIG. 6 shows a plane sectional view of an alternative embodiment for a longitudinal carrying steel frame part 54, where only longitudinal connection plate members 56 being provided between the outermost respective upper and lower corrugations 58, 60, while the central cavity again is filled with a suitable insulating material 62, while FIG. 7 shows a perspective view of said longitudinal carrying steel frame part 54.

FIGS. 8 and 9 show perspective views of an embodiment for a longitudinal carrying steel frame 4 similar to that of FIG. 1, that is where longitudinal narrow bend-in edges 14 of upper left and right hand side plate-shaped frame parts 10 and 12 of a plate-shaped roof element 6 being interconnected with similar longitudinal narrow bend-in edges 16 of said longitudinal lower steel frame part 8.

FIG. 10 shows a perspective view of a further embodiment for a longitudinal carrying steel frame 57, where a bottom part 58 in order to improve the general load carrying capacity is provided with longitudinal directed corrugations 60. FIG. 11 shows an enlarged view of an end portion of said longitudinal carrying steel frame 57.

FIG. 12 shows a perspective view of an alternative longitudinal girder-like construction 63 built-up of two uniform but inverted steel plate profiles 64 having upper and lower longitudinal corrugations 66 which being interconnected a number of longitudinal connection plate members 36, two of which being present at opposed sides of said girder-like construction 63.

Advantageously, said connection plate members 36 may exist of so-called Power Board® consisting of inorganic, fireproof composite material such as Perlite (MgO) reinforced with more layers of glass fibre netting. Said Power Board® being available in standard size of 1220×2440 mm, from which said connection plate members 36 may be cut with suitable height and lengths.

By the mounting of said connecting plate members 36 vertical joints between adjoining connecting plate members are mutually displaced and the connection plate members are connected to each others and to vertical plate portions of said inverted steel plate profiles 64 and the respective side parts of said longitudinal corrugations 68—preferably by gluing. Between said longitudinal connection plate members 36 is by gluing interconnected a layer of semi-hard insulation material.

According to an alternative embodiment said longitudinal plate member 36 may be substituted by other plate material having low thermal conductivity—such as stainless steel.

This alternative girder-like construction 63 may be built-in between longitudinal carrying steel frames 20 according to the invention in order to provide for an alternative manner of improving the carrying capacity and length of free span of prefabricated roof plate elements 6 according to the invention.

Furthermore, said alternative girder-like construction 63 may be used as a standard carrying girder in order to substitute more expensive laminated wooden girders or the like.

FIG. 13 shows an enlarged perspective view of a lower steel plate frame portion 4 similar to that shown in FIG. 8, where a central bottom part being provided with a large number of perforations 67 and possible provided with an upper fabric cower 68 to improve the acoustic qualities of the bottom part of said roof plate element 6. In this connection it is very important that a suitable vapour barrier is arranged directly above said upper fabric cower 68 at the upper side of said central bottom part.

FIG. 14 shows an enlarged perspective view of a modified embodiment for lower steel plate frame portion provided with transverse corrugations 69, while FIG. 15 shows a perspective view of a further modified embodiment for a lower steel plate frame portion provided with longitudinal corrugations 60.

FIG. 16 shows an enlarged perspective view of a part of an embodiment for a plate-shaped roof element 6 according to the invention consisting of three assembled plate-shaped roof plate elements 20 as seen in FIG. 5.

FIG. 17 shows an enlarged perspective, partial view of the prefabricated plate-shaped roof element 6 shown in FIG. 16 and provided with upper, transverse corrugated steel plate profiles 70, while FIG. 18 shows an enlarged perspective, partial view of the plate-shaped roof element 6 shown in FIG. 17 and provided with upper semi-hard plates 72 of insulating material, and finally FIG. 19 shows an enlarged perspective, partial view of the plate-shaped roof element 20 shown in FIG. 18 and finally provided with an uppermost roof folio covering 74.

FIG. 20 shows a perspective view of the plate-shaped roof element 6 according to the invention as shown in FIGS. 16-19—as seen from below, while FIG. 21 shows a plane sectional view through the plate-shaped roof element 6 shown in FIGS. 16-20, while FIG. 22 shows a perspective view of the plate-shaped roof element 6 according to the invention as shown in FIGS. 16-19—as seen from above,

FIG. 23 shows a perspective view of an enlarged end portion of the steel plate frame 57 similar to that shown in FIG. 11 and provided with an end closing panel 76, while FIG. 24 shows a perspective view of an enlarged end portion of the steel plate frame similar to the lower frame portion 8 shown in FIGS. 8 and 9.

FIG. 25 shows a perspective view of an enlarged end portion of an upper side part of the steel plate frame 26 shown in the left hand side of FIG. 3, while FIG. 26 shows a perspective view of an enlarged end portion of an upper side part of the steel plate frame 28 shown in the right hand side of FIG. 3.

FIG. 27 shows a perspective view of an enlarged end portion of a lower side part of the steel plate frame 8 shown in the left hand side of FIG. 8, and FIG. 28 shows a perspective view of an enlarged end portion of an upper side part of the steel plate frame 10 shown in the left hand side of FIG. 8.

The general width of each of said longitudinal steel plate frames 8, 20, 34, 54 is between 500 and 1500 mm, whereby the total width of three interconnected longitudinal steel plate frames may vary from 1500 and 4500 mm, normally the maximum with allowed for road transportation may vary from 3000-3600 mm

The height of the side panels of the lower steel plate frame 8 comprising the longitudinal bend-in edges 14, 16 (FIGS. 1 and 2) may vary from 50-200 mm, while the height of the upper left and right hand side panels 10, 12 may vary from 50-500 mm.

The height of the side panels 30, 32 of the upper longitudinal steel plate frames 26, 28 (FIG. 3) may be about 150 mm, while the height of the side panels 22, 24 of the lower longitudinal steel plate frame 20 may be about 100 mm.

As mentioned above a prefabricated roof plate element 6, as shown in FIGS. 16-22, may preferable consist of three interconnected side by side longitudinal steel plate frames 20 (FIG. 5). The production being preferably organized in such a manner, that in three separate production lines said longitudinal steel plate frames 20 are produced and the cavities thereof being filled with insulation material.

At the ends of said three lines predetermines lengths of said longitudinal steel plate frames 20 are moved transversely against each other for said interconnection side by side by gluing or by other connecting means, before mounting said transverse metal profiles 70 on top of the already interconnected longitudinal steel plate frames 20 to form a plate-shaped roof plate element 6. Then semi-hard insulation plate members 72 and finally on top thereof is mounted a roof foil covering 74.

FIG. 29 shows a perspective view of an end part 78 of a prefabricated roof element 80 provided with inclined end parts 82 intended to form inclined eaves 84, while FIG. 30 shows a plane side view of the end part 78 shown in FIG. 29.

FIG. 31 shows a perspective view of an end part 86 of a prefabricated roof element 88 provided with a reduced height at an end part 90 intended to form upper eaves 92, while FIG. 32 shows a plane side view of the end part 86 shown in FIG. 31.

FIG. 33 shows a perspective view of an end part 94 of a prefabricated roof element 96 provided with a reduced height at an end part 98 intended to form lower eaves 100, while FIG. 34 shows a plane side view of the end part 94 shown in FIG. 33.

FIG. 35 shows a plane sectional view through an alternative embodiment for a plate-shaped roof element 102 according to the invention, where the roof element 102 is built up by means of two load carrying girders 104—each consisting of upper and lower corrugated frame profiles 106, 108 bend up from thin steel plate, and where longitudinal vertical edge parts 105, 107 being interconnect by means of rigid connection plates 110 as the hollowness between said connection plates 110 being filled with semi-hard plate-shaped insulation material 112.

Afterwards, said girders—possible in situ—being interconnected with a lower bottom plate member 114 formed the ceiling in the building in question, and finally the hollowness between the load carrying girders 104 being filled with a suitable insulation material, before the plate-shaped roof element 102 being closed upwardly by means of possible profiled steel plates and a suitable roof foil covering.

Preferably, said connections between said vertical edges 105, 107 and the rigid connection plates 110 being made by suitable gluing.

FIGS. 36A-C and FIGS. 37A-C showing cross sections illustrating six different widths and heights of said load carrying girders 104, which in practice may vary considerably.

FIGS. 38 and 40 show a perspective and a plane view, respectively, of an embodiment of a production plant 120 for the continuously production of load carrying girders 104, where initially upper and lower frame profiles 106, 108 successively being bend up from straight steel bands at the profile press station 122. The direction of production is marked with an arrow 118.

Then the rigid connection plates 110 at both sides of a semi-hard plate-shaped insulation material 112 are assembled with the upper and lower corrugated frame profiles 106, 108 by means of suitable gluing (FIG. 41)—before the assembled load carrying girder member 125 supported on a roller conveyor 126 is let through a hardening station 124—after the hardening station 124 the assembled load carrying girder member 125 arrive to a cutting station 128 (FIG. 42)—where the final predetermined length of the load carrying girders 104 are adjusted.

As mentioned above an important aspect of the present invention is the possibility that the in situ production of both load carrying girders 104 and the assembling of prefabricated plat-shaped roof elements may be organized by means of a mobile productions plan build-up in one or more containers.

REFERENCE NUMERALS FROM THE DRAWING

• 2 thin steel blank
• 4 longitudinal carrying steel frames
• 6 prefabricated plate-shaped roof element
• 8 longitudinal lower steel frame part
• 10 upper left hand side plate-shaped frames
• 12 upper right hand side plate-shaped frames
• 14 upper narrow bend-in edges
• 16 lower narrow bend-in edges
• 18 wider lower steel frame
• 20 longitudinal carrying steel frames
• 22 lower left hand side vertical side panels
• 24 lower right hand side vertical side panels
• 26 upper left hand side steel frame part
• 28 upper right hand side steel frame part
• 30 left vertical side wall panels
• 32 right vertical side wall panels
• 34 girder-like constructions
• 36 longitudinal, vertical connection plate members
• 38 upper longitudinal corrugations
• 40 lower longitudinal corrugations
• 42 upper wall parts of 20
• 44 lower wall parts of 20
• 46 left hand side innermost side wall panels
• 48 right hand side innermost side wall panels
• 50 narrow cavities between connection plate members
• 52 central cavities of 20
• 54 alternative embodiment longitudinal carrying steel frame part
• 56 longitudinal connection plate members
• 57 alternative longitudinal carrying steel frames
• 58 upper longitudinal corrugations
• 60 lower longitudinal corrugations
• 62 suitable insulation materials
• 63 girder-like constructions
• 64 uniform inverted plate profiles
• 66 upper and lower longitudinal corrugations
• 67 perforations
• 68 upper fabric cower
• 69 transverse corrugations
• 70 upper transverse corrugated steel profiles
• 72 semi-hard insulation materials
• 74 uppermost roof foil material
• 76 end closing profile
• 78 end part of prefabricated roof element
• 80 prefabricated roof element
• 82 inclined end part
• 84 eaves
• 86 end part of prefabricated roof element
• 88 prefabricated roof element
• 90 end part with reduced height
• 92 eaves
• 94 end part of prefabricated roof element
• 96 prefabricated roof element
• 98 end part with reduced height
• 100 eaves
• 102 plate-shaped roof element
• 104 load carrying girder
• 105 upper vertical edges
• 106 upper corrugated frame profile
• 107 lower vertical edges
• 108 lower corrugated frame profile
• 110 rigid longitudinal connection plates
• 112 semi-hard plate-shaped insulation material
• 114 lower button plate member
• 118 direction arrow
• 120 production plant
• 122 profile press station
• 124 hardening station
• 125 load carrying girder member
• 126 roller conveyor
• 128 cutting station

Claims

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.