Premanufactured roof plate element

A prefabricated roof plate element (4), including one or more longitudinal box-shaped girders (24), each having two predominantly U-shaped metal sections (10, 18) which at mutually facing, open sides are interconnected along narrow outwards bent lateral edges (5). The girders (24) are connected at upper and lower sides (19) corrugated in longitudinal direction which office corrugated metal plates (7) which are corrugated in a transverse direction and have approximately the same width as the roof plate element (4). The girders (24) are disposed along opposed sides and at a center of the roof plate element (4). One of the sections (10, 18) is shorter than another one of the sections to forming eaves (6).

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention concerns a prefabricated roof plate element.

2. Description of the Prior Art

Prefabricated roof plate elements may be produced of 100% inorganic materials, which have great significance for durability and maintenance. Besides, it is of great significance that the roof plate elements in question may have a free span of up to 22 meters, that is one single roof plate element may cover about 80 m2, which of course has great significance with regard to reducing the building period.

SUMMARY OF THE INVENTION

The invention is an improved roof plate element, which by means of simple technical measures provides very substantial construction advantages, and which furthermore enables an architecturally very simple and light construction of the visible eave part of the roofing on buildings.

The roof plate element according to the invention has girders and the roofing element is designed with reduced height/thickness at an end part used for forming eaves. By means of simple technical measures substantial building project advantages are achieved which enable an architecturally very simple and light construction of the visible eave part of the roofing on buildings.

Suitably, the roof plate element according to the invention is designed such that the lowermost of the U-shaped metal sections are shorter than the uppermost of the U-shaped metal sections, and that the uppermost U-shaped sections are closed downwards at the end part to form eaves by means of U-shaped metal sections, which are disposed internally of the uppermost U-shaped metal sections and fastened thereto.

With the intention of transmitting the necessary forces between respective parts of box-shaped girders, the roof plate element according to the invention is advantageously designed so that the extreme end parts of the lowermost metal sections are connected with the uppermost metal sections by rectangular connecting sheets, preferably at both sides of the girders.

With the intention of increasing the rigidity of the girders, the roof plate element according to the invention is suitably designed so that the upper and lower metal sections at opposite ends and spaced along the entire length are provided with predominantly rectangular transverse bulkheads which are metal sheets with angular connecting flanges which are fastened preferably by screws to all three sides of the metal sections. n

Suitably, the roof plate element according to the invention is designed so that the rectangular connecting sheets are disposed inside the metal sections, the transverse bulkheads are disposed opposite vertical sides of the connecting sheets, and the connecting sheets and bulkheads at the same time are connected with respective sides of the metal sections by screws.

For further increasing productivity in the production of the roof plate element according to the invention, it may be advantageous to design the roof plate element so that the rectangular connecting sheets are disposed inside the metal sections, the metal sections disposed inside the upper metal sections continue inwards beyond the connecting sheets, the transverse bulkhead is disposed opposite both vertical sides of connecting sheets, and the connecting sheets, bulkheads and internal metal sections at the same time are connected with respective sides of the metal sections by screws.

In order to further stabilize the rigidity of respective box-shaped girders, the roof plate element according to the invention is preferably designed so that the transverse bulkheads in respective metal sections are disposed opposite each other, and respective connecting flanges thereof are also interconnected.

With the object of facilitating anchoring the roof plate element according to the invention to building structures, it is advantageous to design the roof plate element to have a transverse opening opposite and proximate an innermost part of the end part which is intended for forming eaves.

DETAILED DESCRIPTION OF THE INVENTION

FIGS. 1 and 2show sectional views of a building2provided with embodiments of roof plate elements4according to the invention, where eaves6are established by means of roof plate elements4with reduced thickness/height from the edge of the building2. The roof plate elements4according to the invention are spaced apart along the top surface (into the page) of the girder8to support the roof of the building. The roof plate elements4are supported and anchored on steel girders8in such a way that the roof plate elements4within the steel girders8have greater thickness/height than outside the steel girders8.

As it also appears fromFIGS. 1 and 2, the roof plate elements4opposite an innermost part of the end part which forms eaves6are designed with a transverse opening28, through which it is possible to anchor roof plate elements6to girders8, by means of prefabricated angle braces30. Subsequently, the opening28is filled with insulating material as illustrated before mounting a loose cover plate32and covering with roofing material.

FIGS. 3 and 4show views of a roof plate element4which has eaves6with reduced thickness/height outside of a steel girder8. The eaves6have an outer extended part of an upper U-shaped metal section10which is closed downwardly by a lower U-shaped metal section12disposed internally of the metal section10, and which is disposed inwardly of internal rectangular connecting sheets14.

An outer end16of a lower U-shaped metal section18is connected with the upper metal section10by the connecting sheets14and by angular connecting flanges20of traversing bulkheads22, which are disposed opposite vertical side edges of the connecting sheets14so that the connection with the metal sections10,12,18and the connecting sheets14and the connecting flanges20, respectively, may be established at once by means of screws21extending through these respective parts.

FIG. 4shows most clearly that the upper and lower U-shaped metal sections10,18which are interconnected at opposite outwardly bent lateral edges5, for example, by means of clinching (press jointing) or in other ways. The lower and upper surfaces of the metal profiles10,18are designed with trapezoidal profiling19which extends in the longitudinal direction of the girder. The connecting flanges20of the plate-shaped bulkheads22and the internal U-profile of metal section12are interconnected by screws21.

FIG. 5show girders24during production which are shown with the top side facing downwards, so that the eaves6, which are downwardly closed by the U-shaped metal section12, are clearly seen. Photographic view6shows how the connecting sheets14, during production of the girders24, are disposed inside the girders24.

FIG. 7shows an example of a building26which is provided with eaves6according to the invention, and which provides outermost, light ending of at the roof plate elements.

With a roof plate element according to the invention, the lower parts of the metal profiles of the girders are not provided from the edge of the building, so that the eaves6, the roof plate element and girders, respectively, have upper extended metal profiles with internal U-shaped metal sections which are closed downwardly. However, of course, there is nothing to hinder the roof plate element according to the invention from being reversed, so that the reduced thickness/height faces upwardly.

In that case, the lower U-shaped metal sections of the girders continue outwards and form the eaves themselves in such a way that the lower U-shaped metal sections of the girders, that is along the edge of the building, are suspended at outer end parts of the upper metal sections by the connecting sheets, etc. The upward facing reduced height/thickness of the roof plate element may thus suitably be used for forming an outwardly inclining roof gutter so that the roof plate element may be finished outwardly by an raised edge or end plate (sternplade).

Finally, it is to be noted that prefabricated roof plate according to the invention may have one or more girders24, metal corrugated upper cover plates7, insulation plates covered with asphalt roofing or film roofing. Such a roof plate element according to the invention may downwardly, for example, be covered with perforated, corrugated steel sheets that are secured directly at the bottom side of the girders24, and which thereby form part of the roofing.