EP0792975B1 - Hollow box profile - Google Patents

Abstract

The hollow box profile (1) has a steel strip which is reshaped roughly into a cuboid. The strip has stamped holes, and has longitudinal edges which are connected to one another. The edges of the strip butt against one another without overlapping, and the four edges (6) of the profile are rounded and stiffened. The rounding and stiffening may be achieved by hollow mouldings or crimps on the edges. At least the broad sides (2,2') of the profile may have crimps (8) which bulge outwards, and which run parallel to the edges.

Description

The invention relates to a hollow box profile, the especially for those that can be produced in a modular design and are light removable partition systems are provided and is suitable and that from essentially cuboid reshaped steel strip with punched holes consists.

Partition systems of the type in question exist generally of a load-bearing mullion-transom construction, said box girder profile both as a post as can also be used as a latch, and from wall, Window and door modules attached to the load-bearing structure are preferably releasably attached, the individual Modules made of wood, plastic, wood composite materials, metal or glass can exist. That for the establishment of the supporting structure used box girder profile comes doing so is crucial, both in terms of mechanical stability, especially torsional rigidity, as well as with regard to fire and noise protection requirements, which are mainly used in commercial Area used partition systems have to.

Using hollow box profiles of the aforementioned Generic room partition systems are for example from the utility model G 87 17 904 and the Utility model G 88 16 913 known. The ones described there Profile stands have hollow chambers arranged in pairs, the side walls in one piece via a central connecting web are interconnected. The facing the wall panels Outside walls of the hollow chambers are punched with holes provided in the form of grid openings, which the recording of hanging elements attached to the back of the wall panels serve or as hanging openings for additional parts to be hung, such as shelf consoles, Wall cabinets or the like are formed.

The known hollow box profiles were made in one piece from one Steel strips formed by rolling, the two end sections of the steel strip flat with adjacent wall sections the profile by welding or clinching ("Verclinchen") have been connected.

Although the well-known box girder profiles are sufficiently rigid were and very good fire and noise protection properties aesthetically, they couldn't All wishes come true, especially with glass partitions with glass wall panels and negative all-glass doors made noticeable. In the case of glass partitions, the load-bearing Construction to be as dainty and slim as possible not reduce the glazed area more than is absolutely necessary and the visual appearance of the partition not to bother. At the same time, however, the mechanical Stability, especially the torsional stiffness, of Box girder profile rather larger than the known, relatively coarse and large-sized constructions, because the weight of the all-glass modules is usually ( is larger than that of double-skin partition walls made of wooden panels or fiberboard.

From EP-A-0 149 465 is a cavity profile as a wall support for the creation of temporary room divisions or as a support known for racks for presenting goods. The cavity profile is made from a standard profile bar one or more rolling operations are produced, two opposite flat walls of the profile bar at least around half the profile wall thickness is set back inwards, so that there is a flat saddle and at the same time Edge beads arise at the corners of the profile bar. About the Edge beads are made from a one-part or multi-part formwork Metal or plastic clipped on to the profile bar to be aesthetically appealing. The profile bar points in two opposite sides of the hanging openings, for example for hanging support elements. The Longitudinal edges of the profile are without overlapping with each other connected and rounded.

The invention has for its object a hollow box profile to create that especially for room partition systems is suitable in modular construction, the modules of which are entirely or consist predominantly of glass, the box girder profile can be used equally as a post and as a transom should and on the one hand a comparatively delicate look, on the other hand, however, preferably at least the same size greater torsional stiffness than the previously known should have coarser profiles.

This object is achieved in that the Longitudinal edges of the essentially cuboid with punched band steel from which the Hollow box section exists, butt joint, without overlap, are interconnected that the edges of the box girder profile are rounded and stiffened and that at least the Broad sides of the profile have beads that are curved outwards, that run parallel to the edges.

By joining the longitudinal edges of the steel strip together there is preferably a cuboid hollow box shape, which the previous paired arrangement of hollow chambers and the previously required connecting bridge between them Chambers which, in relation to the torsional rigidity of the Overall profile was a weak point, making it superfluous. As a result, the profile according to the invention can not only be simpler, but above all slimmer, more delicate and with smaller dimensions are produced than previously was the case. The narrow sides that appear visually of the box girder profile only need about half as much to be as wide as the holding legs or pairs of holding legs the well-known profile stand. In addition, the invention Hollow box profile both as a stand or post as well as a bar or ceiling connection, floor connection or use a wall connection profile.

The rounding and stiffening of the edges of the invention Hollow box profile also improves the mechanical Strength, especially the torsional stiffness.

At least the broad sides of the profile have additional, beads bulging outwards parallel to the rounded ones and stiffened edges run and together with the Form edges of longitudinal stiffening ribs which also serve as guide rails for attachable Fasteners can serve.

The edges of the profile are preferably by hollow embossing or beads rounded and stiffened.

The broad sides of the profile preferably each have one on the inside of the wall, which creates an in Longitudinal groove runs, which in turn Fasteners can hold, such as glass holder or connecting bracket for connecting posts and locking without the overall slim appearance of the box girder profile to affect.

The longitudinal edges of the steel strip are preferably in abutment welded or soldered together.

In a further preferred embodiment of the invention are punched holes in both the broad sides and in provided the narrow sides of the profile, each in a predetermined distance formed as grid openings are. These grid openings can be used as hanging openings Hooking in suitable hooking elements such as Angles, hooks or the like, or as mounting openings for screws, rivets, clamps, bolts or the like or for passing electrical lines, computer cables, Telephone lines etc. can be used.

The grid openings in the two broad sides lie opposite each other preferably congruent to the implementation of lines or cables to facilitate. Also the Grid openings in the two narrow sides can face each other are congruent. However, it is preferred that the grid openings in the two narrow sides each side have the same click distance, but with respect to the openings on the opposite Side by half the rest distance from each other are offset. This staggered arrangement of the grid openings in the two narrow sides has the advantage that from the one side in the punched holes hanging organs or fasteners with those of the opposite Narrow side into the interior of the box girder profile protruding fasteners do not come into contact and that assembly on one side is not through assembly is disturbed on the opposite side.

The punched holes in the narrow sides point preferably a substantially square or rectangular one Shape up. However, it is particularly preferred if these punched holes in the narrow sides in at least two their mutually opposite edge boundaries in each case a part-circular extension for guiding an assembly screw or a similar connecting means. An embodiment is particularly advantageous in which the pitch circle of these pitch circle-shaped extensions extends more than 180 °, because then screws or the like Lanyard through the part-circular Let the opening formed plug in without assembly, before the actual attachment, fall out again.

In another advantageous embodiment of the invention are the narrow sides and parts of the broad sides of the Box girder profile through one or multi-part cladding fully or partially covered. This allows one in Modular construction of the room partition optically any desired Customize the design. The formwork is preferred using suitable connecting means such as Clamp through the punched holes on the profile attached. The connecting means can locking lugs or - have tongues or other engaging parts that for example by means of a predetermined breaking point when exceeded a predetermined force without any special effort remove or have it removed. The formwork can made of wood, wood composite material, aluminum or others Metals or plastic.

In a further embodiment of the invention Hollow box profiles have the narrow sides in addition to already mentioned punched holes on grid openings that as hanging openings for hanging shelf consoles, Furniture parts or the like are formed so that before a room partition made with this curtain further parts can be.

In a particularly advantageous embodiment of the Invention is the interior of the box girder profile in divided several separate chambers. This Subdivision leads to a further mechanical one Stiffening of the profile and on the other hand seals the individual Chambers against the passage of heat and sound from time to time reduces the rate of fire spread in the event of a fire from one side of the partition to the other.

The division into several chambers can, for example by at least one bulkhead running in the longitudinal direction respectively. The hollow box profile preferably has two Bulkheads that consist of strips of sheet steel that connect opposing beads in a web-like manner. The steel sheet strips can be used as separate parts pulled in and pinched or by gluing, soldering or Welding can be attached or they can be bent into a U-shape and be inserted into the profile under tension.

The U-shaped bent and inserted into the profile under tension Sheet steel strips are advantageous in that Profile used that their free legs in the area the edges and beads formed inside the profile Intervene in the gutters.

The division into several chambers is done with other preferred ones Embodiments of the invention by at least a longitudinal partition that or in several layers by forming the steel strip in one piece with the profile is formed. Here, the at least one Partition formed as an integral part of the profile. If the partition consists of two superimposed Layers of the one-piece formed steel strip is formed, the outer shape remains essentially closed Get cuboids.

In further embodiments of the invention, two separate chambers but also formed thereby be that at least one broad side of the box girder profile has a U-shaped groove, the bottom of which either on the opposite broadside or at the bottom of the opposite attached U-shaped groove. In this The partition is trapped in one layer by forming of the one-piece steel strip, one in cross section symmetrical or asymmetrical "dog bone" structure arises, which also in the sense of the invention "in is essentially cuboid ", since it is formed by one or both sides Introduction of U-shaped grooves in the broad sides of a strictly cuboid profile.

One or more of the chambers formed by the bulkheads or U-shaped grooves can be used with heat-insulating, sound insulating and / or fire retardant material be filled out, for example with fiber mat strips, Plasterboard strips, foam plastic, expanded graphite rods and the like. Part of the profile cross-section itself can be filled with these materials or inserted by a Hollow profile filled and / or reinforced.

Figur 1 zeigt jeweils in Draufsicht eine Breitseite und, quasi abgewickelt, die beiden Schmalseiten einer ersten Ausführungsform des erfindungsgemäßen Hohlkastenprofils;

Figur 2 ist ein Schnitt nach Linie II-II in Figur 1;

Figur 3 ist eine vergrößerte Darstellung der Lochstanzungen 14 in Figur 1;

Figur 4 zeigt schematisch im Schnitt eine andere Ausführungsform des erfindungsgemäßen Hohlkastenprofils, bei dem der Innenraum durch zwei Schotten in drei voneinander getrennte Kammern unterteilt ist;

Figur 5 ist ein Schnitt durch einen Abschnitt einer Glastrennwand mit Holzzarge und Holztüre, hergestellt unter Verwendung einer weiteren Ausführungsform eines erfindungsgemäßen Hohlkastenprofils, das durch Verschalungen teilweise abgedeckt ist;

Figur 6 ist ein Schnitt durch einen Abschnitt einer Glastrennwand mit Holzzarge und Ganzglastür, bei der ein erfindungsgemäßes Hohlkastenprofil auf einer Seite mit einer einteiligen Verschalung, auf der anderen Seite mit einer dreiteiligen Verschalung abgedeckt ist;

die Figuren 7 bis 14 zeigen schematisch im Schnitt weitere Ausführungsformen des erfindungsgemäßen Hohlkastenprofils.

The invention is explained in more detail below with reference to the drawing:

Figure 1 shows a top view of a broad side and, quasi developed, the two narrow sides of a first embodiment of the hollow box profile according to the invention;

Figure 2 is a section along line II-II in Figure 1;

Figure 3 is an enlarged view of the punched holes 14 in Figure 1;

Figure 4 shows schematically in section another embodiment of the hollow box profile according to the invention, in which the interior is divided by two bulkheads into three separate chambers;

FIG. 5 is a section through a section of a glass partition wall with a wooden frame and wooden door, produced using a further embodiment of a hollow box profile according to the invention, which is partially covered by cladding;

FIG. 6 is a section through a section of a glass partition wall with a wooden frame and all-glass door, in which a hollow box profile according to the invention is covered on one side with a one-piece formwork and on the other side with a three-part formwork;

Figures 7 to 14 show schematically in section further embodiments of the hollow box profile according to the invention.

The hollow box section 1 (Fig. 1, Fig. 2) is made in one piece band steel provided with punched holes 11, 12a, 12b, 13, 14 manufactured, which has been formed so that one in gives substantial cuboid box shape. The long edges of the steel strip are in abutment without overlap Welding joined together (weld 5, Fig. 4). The hollow box section 1 has two opposite one another Broad sides 2, 2 'and two opposite one another Narrow sides 3, 3 '. The four edges 6 of the box girder profile 1 are rounded by hollow embossing or beads stiffened. The broad sides 2, 2 'each point two outwards curved beads 8, which run parallel to the edges 6. In addition, the broad sides 2, 2 'each have one bent-in wall area 10. When embossing or Beading of the edges 6 are inside the hollow box section 1 Stamp troughs 7 have been formed when inserting the beads 8 corresponding stamp channels 9 (Figure 4).

All punched holes 11, 12a, 12b and 13 in the broad sides 2, 2 'and the punched holes 14 in the narrow sides 3, 3 'are designed as grid openings, the punched holes 14 in each of the two narrow sides 3, 3 'with one another have the same locking distance x. The punched holes 14 of the one narrow side 3, however, are opposite the Punch holes 14 on the other narrow side 3 'by half Locking distance x / 2 offset while the grid openings 11, 12a, 12b and 13 in the two broad sides 2, 2 'are congruent to each other.

The substantially rectangular punched holes 14 in the Narrow sides 3, 3 'face in opposite to each other Edge boundaries 15 each have a part-circular extension 16 for guiding or receiving an assembly screw on. Because the part circle of these part circular extensions 16 extends over more than 180 °, one through the Extension 16 screw does not fall out, though the extension 16 to the punch 14 is open. Because of the offset by half the locking distance x / 2 the extensions 16 of a narrow side 3 in the register with the extensions 16 of the opposite Narrow side 3 ', so that screws or other fasteners horizontally through the entire hollow box section 1 can be inserted, although the punched holes 14th themselves are not diametrically opposed to each other.

In the embodiment shown in Figure 4 is the Interior of the hollow box section 1 by two in the longitudinal direction running bulkheads in three separate Chambers A, B, C divided. The Scots consist of Sheet steel strips 35, which preferably have no punched holes exhibit. The bulkheads are inside the hollow box section 1 in those left behind during the formation of the beads 8 Stamp grooves 9, the contours of the at correspond to the production used profile rollers inserted and either fixed there by locking or simply jammed or glued, welded or soldered. In this way, they are opposite each other Beading 8 web-like interconnected, the against each other partitioned chambers A, B, C with heat-insulating, sound insulating and / or fire retardant material (in the drawing not shown) can be completed.

The use of the hollow box profile according to the invention Profile stand (post) in the supporting structure of a Glass partition is illustrated by Figures 5 and 6: the Narrow sides 3, 3 'and parts of the broad sides 2, 2' of the hollow box section 1 (Figure 5) are grooved accordingly Cladding 17, 18 made of wood, wood composite or Plastic covered. The formwork 17, 18 are with Attached to the hollow box section 1 with the aid of connecting clips 20, the connecting brackets 20 on the one hand Screwed on the bottom of the grooves 36 of the casing 17, 18 or pinned and on the other hand through the punched holes 14 inserted in the narrow sides 3, 3 'of the profile 1 in a latching manner are.

A glass holder 32 in the form of a U-shaped curved rail made of metal or plastic is suitably shaped Retaining tabs (not shown) in the punched holes 12a in the cranked wall area 10 one of the two narrow sides 2, 2 'hung around the glass pane 28 of the glass partition element to keep. In the formwork 17, 18 are sealing grooves 30 provided in the permanently elastic sealing profiles 29 are used, which on the glass pane 28 issue.

On the opposite broadside 2 is cranked Wall area 10 attached a wooden door frame 21, the also a sealing groove 31 for receiving the permanently elastic Has door seal 27. A wooden door 23 is via hinges 25 in the casing 17 rotatably attached.

In the glass partition shown in FIG. 6, the glass pane is 28 in (not shown) floor and ceiling connection profiles held so that the glass holder 32 is dispensed with could be. On the opposite side of the Hollow box section 1 is a bent wall area 10 Door frame 22 attached, in the sealing groove 31 a permanently elastic Sealing profile 27 is attached. Instead of one Wooden door here is an all-glass door 24 using the door hinges 26 attached to a special fitting 33, which in turn attached to profile 1 with suitable fasteners is. While the side of the hollow box section 1, on which the All-glass door 24 is hinged, with a wooden casing 17 is covered, is the opposite side of the profile 1 with a three-part formwork 19a, 19b, 19c Aluminum profiles covered, with the middle formwork 19b with the aid of hooking elements 34 in additional punched holes is attached to the narrow side of profile 1 and can be removed at any time if necessary.

The embodiments shown in Figures 7 and 8 of the box girder profile according to the invention are characterized by Bulkheads made of U-shaped steel sheet strips 37, 38 from, which are inserted under tension in the profile 1, and although advantageously so that their free legs 39, 40th engage in the troughs 7, 9, which are inside the Profile 1 formed in the region of the edges 6 and 8 beads are. By inserting a sheet steel strip 37 (Figure 7) two different sized, separate from each other Chambers A and H. Would a second U-shaped symmetrical bent sheet steel strips into the profile according to Figure 7 would use what is easily possible three separate chambers are created, similar to the Chambers A, B, C of the embodiment according to Figure 4. When inserted of a sheet steel strip 38 that shown in Figure 8 Shape, the interior of profile 1 is in three Chambers A, B, C divided.

In the embodiments of the hollow box profile according to the invention according to Figures 9 to 11 are two or three of each other separate chambers D, G; D, E, F by one or two intermediate walls 42 running in the longitudinal direction are formed, which are an integral part of forming the steel strip of the profile 1 are formed. The partition walls 42 are each in two layers, created by bending back the Strip steel by 180 °, either starting from a broad side (Figure 10) or starting from both, opposite to each other Broad sides (Figure 9). In these embodiments remains the essentially closed cuboid shape of the box girder profile.

In other embodiments again (Figures 12 and 13) can the intermediate walls 41, 41 'in one layer by reshaping the be formed in one piece of strip steel, two of them separate chambers D, F by at least one in one Broad side 2, 2 'of the profile 1 introduced U-shaped groove 43, 44 arise, the bottom 45 either on the opposite Broadside 2 '(Figure 13) or at the bottom 45' the U-shaped groove 44 (FIG 12) is present. The embodiments according to FIGS. 12 also and 13 are inventively under the term "essentially cuboid "subsumed, because the one-sided asymmetrical introduced groove 43 (Figure 13) and the symmetrical grooves 44 (FIG. 12) made on both sides from the strict cuboidal embodiment a "grooved cuboid shape" do. These embodiments also have an opposite state of the art improved torsional rigidity, because both metal strips, the respective groove base form, butt, without overlap, connected to each other are, preferably seamlessly welded together, so that there is no section in which the connection between the two separate chambers D, F only would consist of a single-layer sheet metal strip.

Figure 14 finally shows an embodiment in which a Part of the cross section of profile 1 with heat-insulating, filled with sound-insulating and / or fire-retardant material 46 is. This can reduce the noise and fire protection properties as well as the heat insulating properties of the Hollow box profile can be significantly improved. For example can so by the inserted material 46 itself formed, separate chambers A, C thermally be separated from each other. The material 46 can be made of foamed or non-foamed plastic, for example Polystyrene, polyurethane or silicone, cut from fiber mat, for example from glass fibers or from special ones Fire protection materials such as expanded graphite containing fiber mats or polymers. Also Strips of plasterboard or other conventional Hollow profiles can enter the interior of the hollow box profile 1 inserted or inserted.

The invention is of course not on the drawn Embodiments limited. For example which are attached to the hollow box profile on both sides Formwork outside be profiled in any way. These claddings can be made of solid wood, veneered medium density fibreboard (MDF) or aluminum panels be made.

The glazing of the glass partition modules can be used as single or multiple glazing, also in special soundproofing and fire protection versions.

The box girder profiles used as crossbeams and posts can be connected by metal brackets be, the material thickness of the metal angle particularly advantageous in the wide grooves, which is due to the cranked wall areas in the broad sides of the Profiles are formed.

The hollow box profile can be dimensioned so that the Broad sides about 50 to 60 mm, the narrow sides about 18 to 22 mm long so that the visible parts of the cladding are only about 45 to 55 mm wide.

The overall construction can be designed so that the Conditions of fire protection class F30 are met.

The box girder profile is height-adjustable; through the as Hole punchings can be designed with grid openings Crossbars at any height, according to the locking distance, deploy.

The routing of cables is inside the hollow box section possible.

Door hinges can be attached directly to the steel core of the box girder profile can be fixed using mounting plates.

The box girder profile according to the invention is thus universal usable and allows the realization architecturally and visually more appealing, more slender Glass partitions with excellent mechanical stability and in particular improved torsional stiffness, wherein the profile is easier and cheaper to manufacture than the previously known solutions.

Claims (26)

1. A hollow box section, in particular for room partition wall systems in modular construction, consisting of band steel shaped substantially in parallelepiped form and provided with perforation punchings, characterized in that the longitudinal edges of the band steel are connected with each other end to end, without overlapping, that the edges (6) of the hollow box section (1) are rounded and reinforced and that at least the broad sides (2, 2') of the section (1) have outwardly arched beads (8) which run parallel to the edges (6).
2. The hollow box section according to Claim 1, characterized in that the edges (6) of the section (1) are rounded and reinforced by concave stamping or beading.
3. The hollow box section according to Claim 1 or 2, characterized in that the broad sides (2, 2') of the section each have an inwardly offset wall region (10).
4. The hollow box section according to any of Claims 1 to 3, characterized in that the longitudial edges of the band steel are welded or soldered to each other end to end.
5. The hollow box section according to any of Claims 1 to 4, characterized in that perforation punchings (11, 12, 13) are provided in the broad sides (2, 2') and perforation punchings (14) are provided in the narrow sides (3, 3') of the section (1) and are constructed as grid apertures.
6. The hollow box section according to Claim 5, charactrized in that the grid apertures in one broad side (2) and those in the other broad side (2') lie opposite each other congruently.
7. The hollow box section according to Claim 5, characterized in that the grid apertures in one narrow side (3) and those in the other narrow side (3') lie opposite each other congruently.
8. The hollow box section according to Claim 5, characterized in that the grid apertures in one narrow side (3) and those in the other narrow side (3') with the same notch spacing (x) on each of the two sides are staggered with respect to each other by half the notch spacing (x/2).
9. The hollow box section according to any of Claims 1 to 8, characterized in that the perforation punchings (14) in the narrow sides (3, 3') have a substantially square or rectangular shape.
10. The hollow box section according to Claim 9, characterized in that the perforation punchings (14) in at least two of their marginal boundaries (15), lying opposite each other, have an enlargement (16) in the form of a partial circle for guiding a fitting screw or a corresponding connecting means.
11. The hollow box section according to Claim 10, characterized in that the partial circle of the enlargement (16) in the form of a partial circle extends over more than 180°.
12. The hollow box section according to any of Claims 1 to 11, characterized in that the narrow sides (3, 3') and parts of the broad sides (2, 2') are covered fully or partially by one-piece or multi-peace casings (17, 18 19a, b, c).
13. The hollow box section according to Claim 12, characterized in that the casings (17, 18, 19a, b, c) are fastened to the section (1) by means of suitable connecting means (20) through the perforation punchings (14).
14. The hollow box section according to Claim 13, characterized in that the casings (17, 18, 19a, b, c) are detachably fastened to the section (1).
15. The hollow box section according to Claim 13 or 14, characterized in that the casings (17, 18 19a, b, c) consist of wood, wood composite material, aluminium or plastic.
16. The hollow box section according to any of Claims 1 to 15, characterized in that the narrow sides (3, 3') in addition to the perforation punchings (14) have grid apertures which are constructed as suspension openings for the suspending of shelf brackets, furniture parts or the like.
17. The hollow box section according to any of Claims 1 to 16, characterized in that its interior is divided into several chambers which are separated from each other.
18. The hollow box section according to Claim 17, characterized in that its interior is divided into several chambers (A , B , C ; A , H) which are separated from each other, by at least one partition extending in longitudinal direction.
19. The hollow box section according to Claim 18, characterized in that it has two partitions which consist of sheet steel strips (35) which connect with each other, in the manner of a cross-piece, beads (8) lying opposite each other.
20. The hollow box section according to Claim 18 or 19, characterized in that the partitions consist of sheet steel strips (37; 38) bent in a U-shape, which are inserted under tension into the section (1).
21. The hollow box section according to Claim 20, characterized in that the sheet steel strips (37; 38), bent in a U-shape, are inserted into the section (1) so that their free limbs (39; 40) engage into punch channels (7, 9) formed in the region of the edges (6) and beads (8).
22. The hollow box section according to Claim 17, characterized in that it is divided into several chambers (D, F; D, E; D, G) separated from each other, by at least one intermediate wall (41; 41'; 42) extending in longitudinal direction, which is formed in one or more layers by reshaping of the band steel in one piece with the section (1).
23. The hollow box section according to Claim 22, characterized in that two chambers (D, F), separated from each other, are formed in that at least one broad side (2, 2') has a U-shaped groove (43; 44), the base (45) of which lies against the opposite broad side or against the base (45') of the opposite U-shaped groove (44).
24. The hollow box section according to any of Claims 17 to 23, characterized in that at least one of the chambers (A - H) is filled with material which is thermally insulating, sound insulating and/or fire-resistive.
25. The hollow box section according to Claim 23, characterized in that the groove(s) (43; 44) is (are) filled with material which is thermally insulating, sound insulating and/or fire-resistive.
26. The hollow box section according to any of Claims 1 to 16, characterized in that a portion of its cross-section is filled with material (46) which is thermally insulating, sound insulating and/or fire-resistive or is filled and/or reinforced by a hollow section which is pushed in.

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