EP0754824A1 - Roof structure with canvas panels and a plurality of lattice girders to receive the canvas panels in between as well as a lattice girder for such a roof structure - Google Patents

Abstract

The roof arrangement comprises lattice beams (11) with two grooves (17,18) located on both sides of a central strap (13). The central strap has a rectangular box profile and the grooves are provided on the longitudinal sides. An upper strap (12) and a lower strap (14) are both spaced at the same distance from the central strap. Sloping stiffening bars (16) are provided between the upper and lower straps and are arranged perpendicularly to the connecting bars (16).

Description

The invention relates to a roof arrangement according to the preamble of claim 1 and a lattice girder according to the preamble of claim 6.

Various designs of roof arrangements with lattice girders and tarpaulins stretched between them are already known (DE 82 30 404 U1). In the case of a roof arrangement or a lattice girder of the type mentioned at the beginning (DE 86 17 398 U1), three or four belts arranged one above the other are provided, which can be provided on both sides with welt grooves for pulling in the welt of the tarpaulin.

In this way, cross connectors can be arranged between individual lattice girders above a retracted tarpaulin, which in particular makes it easier and safer for people to walk above the tarpaulin. Additional components such as e.g. Supporting structures or scaffolding can be arranged.

A disadvantage of the known roof arrangement or the known lattice girder is the use of four belts, the relatively large difference in height of the tarpaulins, which are drawn into the upper or lower of the two inner belts, and the presence of a total of three lattice structures arranged one above the other, which is a large one Total height results. The large spacing of the middle straps is due to the system, since the middle truss stiffened with vertical and diagonal struts determines the load-bearing capacity of the girder and the requirement to bridge a large span makes the relevant large spacing indispensable. The fields at the top and bottom, which are only equipped with vertical struts, make only an insignificant contribution to the load-bearing capacity. she primarily serve only to connect additional components.

With three belts, only one tarpaulin can be pulled in or there are no connecting elements at the top or bottom.

The aim of the present invention is to provide a roof arrangement or a lattice girder of the type mentioned, in which better stiffness is achieved with fewer belts and both above and below the tarpaulin optimal possibilities for connecting other structures, connectors and / or Scaffolding parts are available, whereby the accommodation space for several overlapping tarpaulins is minimized.

To achieve this object, the features of the characterizing parts of claims 1 and 6 are provided.

The idea of the invention is therefore to be seen in the fact that for the purpose of making available extensive connecting scaffolding parts both above and below the tarpaulin only three belts arranged at a vertical distance are provided, but several, preferably on the closed central belt, at least on one side there are two superimposed welt grooves, which can be used to pull in the bead or the welt only one tarpaulin or several, in particular two tarpaulins. If tarpaulins are drawn overlapping in the upper and lower welt groove, the height difference is so small due to the arrangement of both welt grooves on a single central chord that it can be neglected in practice. Nevertheless, the vertical distance is sufficient so that the tarpaulins, the piping of which are arranged in superimposed piping grooves, can overlap without contact. If two tarpaulins are stacked on top of each other, for example, for better insulation Because of the closed middle belt there are no lateral air flows between the tarpaulins on the middle belt.

According to the invention, the full beam height is thus made statically usable, and further components can be connected both above and below. According to the invention, this results in substantial material savings without the stability and the numerous connection options for further components being impaired.

According to the invention, there is also the advantageous possibility of connecting the lattice girder to the substructure at its outermost end on the eaves and thereby making optimum use of the girder length.

In order to improve the stability of the overall arrangement with a small distance from several overlapping tarpaulins and to have enough space on the center flange for the stacked welt grooves and for reasons of stability and because of this, similar trusses exist both above and below the center flange, which are universal for the stable connection of others Components are suitable, the measures of claims 2 and 7 are provided.

Thus, while the central chord represents a profile that is preferably closed on all sides, a truss provided with suitable struts extends above and below it.

It is particularly advantageous if there are connection fastening struts running perpendicular to the longitudinal direction for attaching further components and at a clear angle of, for example, 30 to 60 °, in particular approximately 45 ° to the longitudinal direction, oblique stiffening struts. The trusses between the belts own in this way a double function as a connecting element for further components and as a stiffening means for the lattice girder, the presence of a stiffening framework in this regard having a particularly favorable effect both above and below the central belt for the overall strength. Such a preferred embodiment can be found in claims 3 and 8, respectively. Furthermore, the manufacture of the lattice girder from uniform components is facilitated in this way. Furthermore, these lattice girders can be used universally, and the connection of cross connectors and other components is favored.

In order to install a modular system, the procedure according to claims 4 and 9 is used according to the invention. For the creation of pent roofs, it is sufficient if only a single type of partial lattice girders is provided.

Furthermore, ridge roofs can also be realized that have an inclination to the horizontal of e.g. Can have 15 °.

In spite of the outer vertical rod being pushed inwards, when the individual partial lattice girders are assembled, a lattice girder arrangement is achieved in which all vertical struts have the same longitudinal spacing throughout. As a result, standardized stiffening material can be used, and diagonal struts of the same length can be installed in the entire beam area.

The combination of the two advantages is particularly advantageous in that the outer edge of the lattice girder can be connected to the substructure on the eaves, thereby making optimal use of the girder length and, despite the indentation of the outer vertical bar towards the inside, even with assembled partial lattice girders, the same distances between them Vertical bars can be achieved.

The combination of these two advantages is therefore achieved by an asymmetrical design of the partial lattice girders. Although all three belts have the same length, the upper and lower belts are offset from the middle belt. As a result, the upper and middle chords at one end of the beam extend beyond the last vertical to such an extent that a connection of the beam to the substructure at the extreme end is possible and the beam length can thus be fully used to achieve an optimal span. At the other end of the beam, the upper and lower chords are set back by the appropriate amount, while the central chord protrudes in order to accommodate the diagonal braces. As a result, these have the same length for the entire carrier.

It is particularly preferred if at least one, preferably opposite, two parallel keder grooves are provided on the ridge lattice girder above the existing keder grooves, into which a tarpaulin that spans the ridge can be drawn in and covers the gap that remains when one pulls tarpaulins from both sides of the ridge into the keder grooves underneath, which, however, only reach shortly before the ridge.

Due to this design, two tarpaulins can be drawn one behind the other and overlapping each other in the Keder grooves extending over the normal lattice girder, and the gap at the top of the ridge can still be protected against the ingress of rainwater by a ridge tarpaulin.

An essential idea of the invention can be seen in the fact that the piping grooves provided one above the other are not only intended to be able to optionally arrange continuous tarpaulins at different heights, but in particular to the fact that tarpaulins are arranged on both the lower and the upper keder groove. This solution is the subject of claims 5 and 10, among other things. Furthermore, according to these claims, a double roof skin can be present, which is not only important for the tightness of the entire roof arrangement, but also favors the thermal insulation of the roof arrangement. Furthermore, it is possible to work with shorter tarpaulins, which overlap at the joints, which means that there are no sealing problems. At the overlap, ventilation is automatically provided for the space covered by the roof arrangement, without there being any risk of moisture penetrating into the interior because the degree of overlap can be selected accordingly.

It is also advantageous to provide two welt grooves arranged one above the other in the ridge area, because it is generally problematic to run a continuous tarpaulin provided with welt edges on the ridge area over both roof halves. This is due to the greater frictional resistance in the area of curvature of the ridge. From both sides of the ridge, continuous tarpaulins can be guided in a straight line from the underside to almost the ridge in the welt grooves. The gap remaining in the ridge area is then covered by a short piece of tarpaulin, which is inserted in the ridge area into the upper welt grooves and overlaps with the tarpaulin extending from both sides to the ridge with straight piping in the manner necessary to prevent the penetration of moisture.

If the tarpaulins, which extend from both sides to the ridge, merge tightly into one another in the upper welt groove on the ridge, it is advantageous to have a special ridge tarpaulin in the ridge welt above move in.

The invention thus creates not only a roof arrangement and a lattice girder with optimal connection options both on the top and on the bottom of the tarpaulin (s), but also a great universality in the arrangement of two tarpaulins with a slight difference in height and largely independently of one another.

The arrangement according to the invention or the lattice girders thereof can optionally also be used as a wall arrangement by being placed vertically.

Fig. 1

eine Seitenansicht eines für eine erfindungsgemäße Dachanordnung bestimmten Gitterträgers,

Fig. 2

eine entsprechende Seitenansicht eines erfindungsgemäßen First-Gitterträgerteils,

Fig. 3

eine vergrößerte Schnittansicht nach den Linien III-III in den Fig. 1 und 2,

Fig. 4

eine Ansicht analog Fig. 2 einer weiteren, besonders bevorzugten Ausführungsform eines erfindungsgemäßen First-Gitterträgerteils,

Fig. 5

eine schematische Schnittansicht nach Linie V-V in Fig. 4 und

Fig. 6

eine Ansicht analog Figur 1 einer weiteren besonders vorteilhaften Ausführungsform eines erfindungsgemäßen Teil-Gitterträgers.

The invention is described below, for example with reference to the drawing; in this shows:

Fig. 1

2 shows a side view of a lattice girder intended for a roof arrangement according to the invention,

Fig. 2

a corresponding side view of a ridge lattice part according to the invention,

Fig. 3

2 shows an enlarged sectional view along lines III-III in FIGS. 1 and 2,

Fig. 4

2 shows a further, particularly preferred embodiment of a ridge lattice girder part according to the invention,

Fig. 5

is a schematic sectional view along line VV in Fig. 4 and

Fig. 6

a view analogous to Figure 1 of a further particularly advantageous embodiment of a partial lattice girder according to the invention.

According to FIG. 1, a lattice girder 11 according to the invention consists of individual partial lattice girders 11 'of the same design, each of which consists of a straight, in particular tubular upper chord 12, a central chord 13 having a box profile according to FIG. 3, and a rectilinear, preferably tubular lower chord 14, all of which lie in one plane and are connected to form a stable structural unit by connecting fastening struts 15, which are arranged at regular intervals and extend perpendicularly to the belts 12, 13, 14, and oblique stiffening struts 16 arranged between them.

Due to the symmetrical arrangement according to FIG. 1, the partial lattice girder 11 'shown there consists of two halves 11a, 11b which are mirror-symmetrical to one another.

At opposite ends, the partial lattice girders 11 'have plug-in projections 22 or plug-in recesses 23 complementary thereto, by means of which two partial lattice girders 11' can be connected to form a lattice girder assembly 11 which is twice as long.

After the two lattice girders 11 'have been plugged together, the plug connections 22, 23 can be fixed by screw holes 24 provided for this purpose in the plug-in projections 22 or in the region of the plug-in recesses 23.

According to FIGS. 1 to 3, pairs of receiving projections 25 are arranged laterally on the central belt 13 equipped with a box profile, which form a keder groove 17, 17 'and 18, 18', respectively. A keder groove is to be understood as a cavity extending in the axial direction, which is connected to the surrounding atmosphere by a slot 26, which is a vertical one has a significantly smaller expansion than the inner receiving space of the welt groove 17, 17 'or 18, 18'.

At the axial ends of the partial lattice girders 11 ', the welt grooves 17, 17' and 18, 18 'are open, so that from there the bead or the welt 19 of a tarpaulin 20 can be drawn in, as in FIG. 3 is indicated by dashed lines.

1, each lattice girder part 11 'is constructed symmetrically to the central axis 21 of the lattice girder 11. This also applies to the central belt 13 according to FIG. 3 with respect to the welt grooves 17, 17 'and 18, 18'.

The connecting fastening struts 15 are arranged at regular intervals, the subdivision of the lattice girder 11 into partial lattice girders 11 'is such that this equidistant spacing of the connecting fastening struts 15 is maintained even when a plurality of partial lattice girders 11' according to FIG. 1 are put together.

FIG. 2 shows a partial lattice girder 11 ″ intended for arrangement in the ridge, which consists of two parts 11c and 11d which extend on both sides of the ridge and are arranged at an angle to one another and which are connected to one another to form a fixed structural unit.

The straps 12, 14 and the connecting fastening struts 15 preferably consist of round tubes with an outer diameter of 48 mm. The length of the individual lattice girders 11 'should be 4.5 to 6 m.

The function of the lattice girder described or the roof arrangement made from it is as follows:

For the roofing of a certain room is first the required number of partial lattice girders 11 'is selected and put together to form larger structural units and firmly connected to one another. Furthermore, if necessary, a ridge part 11 ″ according to FIG. 2 is also provided and plugged together with the adjacent partial lattice girders 11 ′.

Then the entire lattice girder 11 is then mounted on a corresponding scaffold or substructure, the individual adjacent lattice girders 11 being expediently connected to one another by cross-connectors to form a stable unit, each of which engages the upper connection fastening struts 15 by means of clamping claws, which also at the same time there is an opportunity to inspect the top of the roof.

The piping 19 of tarpaulin 20 is then drawn into the upper and / or lower welt grooves 17, 17 'and 18, 18' from the open underside in order to form a roof skin.

By arranging tarpaulins 20 both on the upper and on the lower welt grooves 17, 17 'and 18, 18', a double roof skin can be realized in a simple manner. It is also possible to first pull a tarp from the eaves only into the lower welt grooves 18, 18 'up to a certain length and then to accommodate another tarpaulin in the upper welt grooves 17, 17', the two tarpaulins should overlap .

If a ridge lattice girder 11 ″ is used, a tarp is drawn from both sides up to approximately the ridge only into the lower welt grooves 18, 18 ′. The gap above is bridged by tarpaulins drawn into the upper welt grooves 17, 17 '. This arrangement is shown in FIG. 2 below or above the welt grooves 17 and 18 by dash-dotted lines Lines indicated.

The overlap of tarpaulins 20 ′ or 20 ″ drawn into the upper welt groove 17 or the lower welt groove 18 is also indicated in FIG. 1 by dash-dotted lines above or below the actual welt grooves 17, 18.

In the embodiment according to FIGS. 4 and 5, the central belt 13 consists of a main central belt part 13 'and a belt-like attachment 13' ', which e.g. 4 and follows the ridge shape of the ridge lattice girder as shown in FIG. 4 and also has keder grooves 27, 27 'on its two opposite sides, into which a ridge covering tarpaulin 20' '' can be drawn.

In this way, it is possible to first pull a tarpaulin 5 m long into the lower welt grooves 18, 18 'in the lower region of the lattice girders, as indicated at 20' 'in FIG. 1. A second tarpaulin 20 'is then drawn into the upper welt grooves 17, 17', overlapping with the end of the first tarpaulin 20 '', but which, as indicated by dash-dotted lines in FIG. 4, only extends approximately to the ridge, where there is a gap 28 remains, which can now be covered according to the invention in that a ridge covering tarpaulin is drawn into the welt grooves 27, 27 ', which is dash-dotted in FIG. 4 and indicated by dashed lines in FIG. 5 at 20' ''.

In the ridge area, three keder grooves 17, 18, 27 or 17 ', 18', 27 'are therefore preferably arranged on each side of the lattice girder, but at least on one side. Due to the arrangement of the third keder groove 27, 27 'in the ridge area, it is possible to use standard tarpaulins with a length of, for example, 5 m. By a different overlap (as can be seen at 20 'in Fig. 1 is), even when using standard tarpaulins of a predetermined length, an exact adaptation to the overall span of the lattice girders can be carried out.

The invention therefore makes it possible that neither special tarpaulins have to be made for the lattice girders according to the invention, nor that tarpaulins which are too large, in particular too long, have to be used, which would be difficult to handle.

4 and 5, with a 5 m standard tarpaulin 20 ′, 20 ″ and a smaller ridge tarpaulin 20 ″ ″, all spans from 10 m to 20 m can be covered safely and without the risk of rain penetrating will.

According to FIG. 6, the central chord 13 at the right end of the partial lattice girder 11 ', where the connecting fastening struts 15 extending perpendicular to the longitudinal direction are clearly distant from the end, is somewhat longer than the upper and lower chords 12 and 14, which are of equal length relative to one another formed, in such a way that the oblique stiffening struts 16 extending to the end of the central belt 13 there may have the same length and the same angle as the parallel oblique stiffening struts 16 arranged further inside in the carrier.

Accordingly, the central belt 13 at the opposite, left end, where it is practically flush with the connecting fastening struts 15, is somewhat shorter than the upper and lower straps 12 and 14, which extend axially somewhat beyond the fastening struts 15.

Because of the design of the partial lattice girder 11 ', all three belts 12, 13, 14 have the same length, but the upper and lower belts 12 and 14 are opposite the central belt 13 arranged somewhat offset in the longitudinal direction of the carrier. As a result, the upper chord 12 and the lower chord 14 at the left end in FIG. 6 extend beyond the fastening struts 15 which are flush with the end of the central chord 13 in the longitudinal direction to the left to such an extent that a connection of the support to the substructure is possible at the extreme end and thereby the Beam length can be fully used to achieve an optimal span. At the other, right-hand end of the support in FIG. 6, the upper and lower chords 12 and 14 are set back by the appropriate amount compared to the central support, while the central support 13 protrudes somewhat to the right in the longitudinal direction of the support, so that the diagonal stiffening struts 16 have the same design as the remaining parallel struts 16 can have the same length and the same angle.

The embodiment according to FIG. 6 thus opens up two important advantages, namely the possibility of connection to substructures at the left end and the same configuration of all oblique stiffening struts 16 running parallel to one another.

Reference list

11

Lattice girder

11 '

Part lattice girder

11 ''

First lattice girder

12th

Top chord

13

Middle belt

13 '

Main middle belt part

13 ''

Essay

14

Lower chord

15

Connection fastening strut

16

Oblique stiffening strut

17th

Keder groove

17 '

Keder groove

18th

Keder groove

18 '

Keder groove

19th

Welt (bead)

20th

Plans

20 '

Extension of the top tarpaulin

20 ''

Extension of the lower tarpaulin

21

Central longitudinal axis

22

Projection

23

Recess

24th

Screw holes

25th

Admission tabs

26

slot

27

Keder groove

27 '

Keder groove

28

gap

Claims (10)

Roof arrangement with at least one tarpaulin (20, 20 ', 20'') and a plurality of side-by-side lattice girders (11), which hold the tarpaulin (s) between them and are supported on a substructure, with an upper chord (12), a central chord (13) and a lower flange (14), between which struts (15, 16) extend, and with at least one welt groove (17, 17 '; 18, 18') on at least one side of the lattice girder in the central flange (13), which is parallel to the longitudinal extension of the lattice girder and into which the piping (19) of the tarpaulin (s) (20, 20 ', 20'') is drawn in in the longitudinal direction,
characterized,
that several, preferably two keder grooves (17, 18; 17 ', 18') are provided one above the other on at least one side and preferably on both sides of the central belt (13). Roof arrangement according to claim 1,
characterized,
that the distance between the belts (12, 13, 14) perpendicular to the longitudinal extension of the lattice girder (11) is a multiple, preferably three to six times, in particular four to five times the thickness of the central belt (13) perpendicular to the longitudinal extension and in the level of the lattice girder (11) and / or that the central chord (13) has a rectangular box profile, on the long sides of which the keder grooves (17, 18; 17 ', 18') are provided and / or that the upper chord ( 12) and the lower flange (14) have the same distance from the central flange (13). Roof arrangement according to claim 1 or 2,
characterized,
that between both the upper chord (12) and the lower chord (14) on the one hand and the central chord (13) on the other hand, apart from perpendicularly to the longitudinal direction of the belt, preferably arranged at the same distance connecting fastening struts (15), preferably at the same distance, inclined stiffening struts (16 ) are provided, preferably two oppositely inclined oblique stiffening struts (16) between each two connection fastening struts (15), and / or that the lattice girder (11) consists of two halves (11a, 11b) that are mirror-symmetrical to its central longitudinal axis (21) ) exists and / or that on the central chord (13) on each side two keder grooves (17, 18; 17 ', 18') are arranged one above the other at the same distance and laterally aligned with each other and / or that the connecting fastening struts (15) with a diameter and a distance are arranged, the attachment of standard components such as cross connectors, support structures or scaffolding with self-locking connections or scaffold couplings allowed. Roof arrangement according to one of the preceding claims,
characterized,
that each lattice girder (11) is divided in the longitudinal direction into individual sub-lattice girders (11 ', 11''), which at their ends can be connected to a structural unit, in particular a plug connection (22, 23) which may be fixed by screws or other fastening means (24) are, in particular a part of the lattice girder (11) being designed as a ridge lattice girder (11 ''), and / or that at one end of each lattice girder (11 ', 11'') one and in particular two perpendicular to the longitudinal extent of the lattice girder, in particular aligned connecting fastening struts (15) are provided and at the other end of the partial lattice girder (11 ', 11'') the last or the last connecting fastening struts (15) so far in the longitudinal direction from this end removed that each partial lattice girder (11 ', 11'') is asymmetrical relative to its central plane extending perpendicular to the longitudinal direction and that after connecting two partial lattice girders (11', 11 '') all connecting fastening struts (15 ) have the same spacing in the longitudinal direction of the lattice girder, the central belt (13) preferably projecting at one end in the longitudinal direction so far beyond the equally long, mutually flush upper and lower belts (12, 14) that the oblique opening at this end -Stiffening struts (16) are of the same design and arrangement as the other struts (16) running parallel thereto, and at the opposite end is set back correspondingly relative to the upper and lower flange (12, 14), and / or that on the ridge mesh support (11 '') at least one of the two welt grooves (17, 18; 17 ', 18') at least one further welt groove (27, 27 ') is provided, the further welt groove (27, 27') preferably also being attached to the central flange (13) or an attachment (13 ') provided thereon. Roof arrangement according to one of the preceding claims,
characterized,
that at least partially tarpaulins (20, 20 ', 20'') are arranged on both superimposed welt grooves (17, 18; 17', 18 '), in particular on both superimposed welt grooves (17, 18; 17', 18 ' ) continuous tarpaulins (20, 20 ', 20'') are arranged or a tarpaulin (20') in the lower area in the lower welt groove (18, 18 '') are arranged and extends only over part of the length of the lattice girder (11) and a further tarpaulin (20 '') is arranged in the upper region in the upper welt groove (17, 17 ') and over the rest of the length of the lattice girder (11) extends and overlaps with the lower tarpaulin (20 '), and / or that a ridge lattice girder (11'') is provided, with the lower welt grooves (18, 18') in Tarpaulin area ending tarpaulin (20 ') and in the upper welt groove (17, 17') of the ridge lattice girder (11 '') a tarpaulin (20 '') overlapping the two lower tarpaulins (20 ') are arranged, and / or that a tarpaulin (20 ''') is provided in the further welt groove (27, 27'). Lattice girder with an upper chord (12), a middle chord (13) and a lower chord (14), between which fastening struts (15, 16) extend, and with at least one welt groove (17, 17 '; 18, 18') on at least one Side of the central belt (13), which runs parallel to the longitudinal extent and into which the piping (19) of a tarpaulin (20, 20 ', 20'') is drawn in in the longitudinal direction, in particular for a roof arrangement according to one of the preceding claims,
characterized,
that two keder grooves (17, 18; 17 ', 18') are provided one above the other on at least one side and preferably on both sides of the central belt (13). Lattice girder according to claim 6,
characterized,
that the distance between the belts (12, 13, 14) perpendicular to the longitudinal extension of the lattice girder (11) is a multiple, preferably three to six times, in particular four to five times the thickness of the central belt (13) perpendicular to the longitudinal extension and in the plane of Lattice girder (11), and / or that the central belt (13) has a closed, preferably rectangular box profile, on the long sides of which the superimposed welt grooves (17, 18; 17 ', 18') are provided and / or that the upper belt (12) and the lower flange (14) have the same distance from the central flange (13). Lattice girder according to claim 6 or 7,
characterized,
that between both the upper chord (12) and the lower chord (14) on the one hand and the central chord (13) on the other hand, apart from extending perpendicular to the longitudinal direction of the belt, preferably arranged at the same distance connecting fastening struts (15), preferably at the same distance, inclined stiffening struts (16 ) are provided, preferably in each case two oppositely inclined oblique stiffening struts (16) between each two connecting fastening struts (15), and / or that it consists of two halves (11a, 11b) which are mirror-symmetrical to its central longitudinal axis (21) and / or that on the central chord (13) on each side two keder grooves (17, 18; 17 ', 18') are arranged one above the other at the same distance and laterally aligned with each other and / or that the connecting fastening struts (15) with a diameter and one Are arranged at a distance, with the attachment of standard components such as cross-connectors, supporting structures or scaffolding self-locking connections or scaffold couplings allowed. Lattice girder according to one of claims 5 to 8,
characterized,
that it is divided in the longitudinal direction into individual partial lattice girders (11 ', 11''), which at the ends, in particular, may be screwed or otherwise Fastening means (24) fixed plug connection (22, 23) are connected to form a structural unit, in particular one part being designed as a ridge lattice girder (11 '') and / or that at one end of each sub lattice girder (11 ', 11') ') one and in particular two connecting fastening struts (15) running perpendicular to the longitudinal extension of the lattice girder, in particular aligned with one another, are provided and at the other end of the partial lattice girder (11', 11 '') the last or the last connecting fastening struts ( 15) are so far in the longitudinal direction from this end that each partial lattice girder (11 ', 11'') is asymmetrical relative to its central plane which extends perpendicular to the longitudinal direction and after two partial lattice girders (11', 11 ''), all connection fastening struts (15) have the same distance in the longitudinal direction of the lattice girder, preferably the central belt (13) at one end in the longitudinal direction so far Over the equally long, mutually flush upper and lower chords (12, 14) protrudes that the oblique stiffening struts (16) opening at this end are of the same design and arrangement as the other struts (16) running parallel thereto, and on the opposite End relative to the upper and lower flange (12, 14) is set back accordingly and / or that at least one of the two welt grooves (17, 18; 17 ', 18'), a further welt groove (27, 27 ') is provided, the further welt groove (27, 27') preferably also being arranged on the central flange (13) or an attachment (13 ') provided on it. Lattice girder according to one of claims 5 to 9,
characterized,
that on both superimposed welt grooves (17, 18; 17 ', 18'), at least partially, tarpaulins (20, 20 ', 20'') are arranged, with tarpaulins (20, 20', 20 'continuously) in particular on the two welt grooves (17, 18; 17', 18 ') arranged one above the other. ') are arranged or a tarpaulin (20') is arranged in the lower welt groove (18, 18 '') and extends only over part of the length of the lattice girder (11) and a further tarpaulin (20 '') in the upper one Kedernut (17, 17 ') is arranged and extends over the rest of the length of the lattice girder (11) and overlaps with the lower tarpaulin (20'), and / or a ridge part (11 '') is provided and on the lower Keder grooves (18, 18 ') in the ridge area ending tarpaulin (20') and in the upper welt groove (17, 17 ') of the ridge lattice girder (11'') a tarpaulin (20''overlapping the two lower tarpaulins (20') ) are arranged, and / or that a tarpaulin (20 ''') is provided in the further welt groove (27, 27').

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