FI63099C - VATTENTAKSKONSTRUKTION - Google Patents

Description

63099

The present invention relates to a water roof structure according to the preamble of claim 1. Such a structure is of the load-bearing type, is made of profiled thin-5 plate and is intended especially for three-hole tendons.

It is already known to use profiled thin-sheet load-bearing structures either as a straight sheet or curved pre-bent. This pre-bending takes place 10 mechanically at the factory.

However, these previously known solutions have e.g. the following disadvantages:

The field moment of the edge fields becomes decisive in the dimensioning and the consumption of the sheet metal material 15 is unnecessarily high.

To drain the water, the roof is inclined in one direction, so that the walls are of different heights, or there is a brush in the middle and the separate parts required for it. The individual plates have to be riveted together at the edges.

The object of the present invention is to eliminate the drawbacks of the previously known solutions and to provide a completely new type of load-bearing gable roof structure.

The invention is based on deliberately causing the supports to deviate from the horizontal plane, so that the central supports are higher in the final structure than the edge supports of a certain size. This can be done either by pressing the straight damper on the site onto supports of different heights, 30 - or by raising the center supports under the straight damper so that the damper is tensioned, or by hanging the outer walls at the ends of the damper, which are thus depressed.

More specifically, the gable roof structure according to the invention is characterized by what is set forth in the characterizing part of claim 1.

The invention provides considerable advantages.

Thus, material is saved when the bending moment is redistributed so that the support moment increases as the field moment decreases, whereby by adjusting the bending ice, the moments can be made equal, which is most advantageous from the point of view of dimensioning the symmetrical profile.

10 When using asymmetric profiles, the torque can again be divided according to the capacity of the profile.

The curvature is still useful in that it provides a tilt to facilitate drainage without the need for brush bends, walls of different heights, or plastic bending that requires factory-15 treatments.

The joints between the boards are also made tighter than with straight boards, and the roof does not rattle in the wind either.

The invention will now be examined in more detail with the aid of an exemplary embodiment according to the accompanying drawing.

Figure 1 shows a partially schematic sectional view of a roof structure bent on four supports according to the invention.

Figure 2 shows the bending moment curves of the roof structure 25 according to Figure 1 before and after bending.

The case shown in Figure 1 is a 1-storey building with a corridor in the middle and rooms on both sides.

The water roof plate 1 is usually a trapezoidal profiled sheet metal with stiffeners, which carries a snow load and stiffens the building against wind loads.

It rests on all four walls (or beams, respectively). The center supports 2, 3, ie the partitions, are at a distance h higher than the edge supports * 4.5, ie the outer walls.

35 Roofing sheets are normal straight standard dampers.

Fastening can be performed, for example, first to the central supports 2, 3 and then to the two 3 63099 edge supports U, 5 simultaneously at the same time, using two installation men. Normally, a man’s weight is enough force to cause curvature.

As a more precise embodiment, mention is made of the size 5 that the height difference h can be about 70 mm when the distance between the center supports 2, 3 is 2.1 m and the distance between each center support 2.3 and the corresponding outer support is U, 8 m. can then be, for example, 70 ... 100 mm.

Fig. 2 shows in broken lines the bending moment curve of a roof structure 10 which, as shown in broken lines in Fig. 1, is placed flat on four supports. In this case, it is observed that the positive peak value B1 of the moment in the edge field area is substantially larger than the negative peak value A1 of the moment 15 at the central support. Raising the central supports 2, 3 by a distance h relative to the edge supports U, 5 gives a torque curve shown in full line in Fig. 2, in which the respective peak values B2 and A2 are approximately equal.

It should be noted that in the case of Example-20 described above, it is assumed that the roof structure is made of symmetrically profiled sheet metal, in which case the aim is that the peak values A2 and B2 of the bending moments become at least approximately equal.

In reality, the roof structures are most often made of asymmetrically profiled sheet metal. In this case, according to the invention, it must be ensured that the peak values A2 and B2 of the bending moments are at least approximately in accordance with the permissible torque calculated for the different sides of the sheet metal.

Within the framework of the invention, it is also possible to consider solutions that differ from the above-described embodiment.

Thus, the tensioning of the plate on the arc required to change the torque distribution can be realized, e.g. This could be the case in particular where the center supports are pillars based on pillars.

11 63099

It is also conceivable to fasten the prefabricated external walls to the roofing sheets first and thus use the walls' own weight for bending.

Within the scope of the invention, it is also conceivable that there are several central supports and edge supports, e.g. 3 or k of each type.

Claims (3)

5,63099 Claims: A load-bearing water roof structure (1), in particular made of profiled sheet metal, supported on at least 5 two outer (U, 5) and two inner support points (2, 3), the inner support points (2, 3) being arranged on the outer support points (U, 5) to a higher level, characterized in that the inner support points (2, 3) are arranged so that the distance between them 10 is at least 30% of the distance between the inner (e.g. 2) and the corresponding outer support point (^) the positive bending moment of the roof structure (1) to reduce the difference between the absolute values of the peak value (B2) and the peak value of the negative bending moment peak (A2). A structure according to claim 1, made of symmetrically profiled thin sheet, characterized in that said peak values (A2, B2) are at least approximately equal in absolute value. A structure according to claim 1, made of asymmetrically profiled sheet metal, characterized in that said peak values (A2, B2) have an absolute value at least approximately in accordance with the permissible torque calculated on different sides of the sheet metal.