DE20221675U1 - Hollow tube section for scaffolding system has reduced wall thickness but same outer defined diameter and with cross-sectional reduction in lower end to be compatible with existing tubular frames - Google Patents

Abstract

The hollow profiled tube (10) has whilst retaining its outer defined diameter a reduced wall thickness compared to known tubes. The lower end area (22) of the tube has at least in some areas a cross-sectional reduction (30.1) so that the permissible gap or a smaller gap is obtained between the inner wall of the lower end area in the tapered region when the tubes are fitted, and the outer wall of the upper insert area (20) of the fitted tube. Independent claim describes scaffold frame where each vertical post is formed as a hollow profiled tube as above.

Description

TECHNICAL TERRITORY

The The present invention relates to a hollow profile rod as a component of a system framework with an upper end region, in particular pipe connector, and a lower end portion, wherein the hollow profile rod has a defined outer diameter and a wall thickness has, the outer diameter the upper end region opposite the outside diameter of the lower end region is reduced, such that a plurality of hollow profile bars can be plugged together are and the upper end in the inserted state in the lower End portion of an adjacent hollow profile bar is inserted to a stop and between outer wall the upper end portion and inner wall of the lower end portion a permissible one Gap exists is and the lower end portion of the hollow profile bar at least partially at least one cross-sectional taper has, in such a way that between the inner wall of the lower Endbereiches in the area of the cross-sectional taper in up or adjacent to each other Hollow profile bars and the outer wall the upper insertion region of the plugged hollow profile rod the permissible Gap or gives a smaller gap.

STATE OF TECHNOLOGY

In proven for decades scaffolding system LAYHER flash scaffolding such hollow profile rods as vertical stems of scaffolding frames used. For mounting the scaffolding become the scaffolding frames simply stacked on top of each other and by scaffold coverings and diagonals longitudinal stabilized.

such Hollow section bars are in a very big size Number in use. The wall thickness such known hollow profile bars in the context of the described scaffolding system is 3.2 mm (millimeters). As a material, for example steel St37 used.

The Size of the game between the stacked scaffolding has a significant Influence on the load capacity of the overall system, since the resulting from the game bending angle enters into the static model between the individual plug-in elements.

PRESENTATION THE INVENTION

outgoing of the cited prior art is the present invention the task or the technical problem underlying a Specify Hohlprofilstabelement and / or a scaffolding frame, the / the can be produced economically, a high level of security ensured within the framework of the use within a scaffold, a low weight has, the easy and quick installation relationship disassembly as in the known framework system maintains and at the same time compatible with the already existing ones in the Use existing hollow profile bars / scaffolding frames is formed.

Of the Hollow profile bar according to the invention is by the characteristics of the independent Claim 1 given. Advantageous embodiments and developments are the subject of the dependent Claims.

Of the Hollow profile bar according to the invention The type mentioned is therefore characterized by the fact that the cross-sectional taper as longitudinal running strip-shaped depression is formed and wherein this indentation preferably in the circumferential direction a grid pattern, in particular according to a circumferential angle of 90 ° in each case (old degree) is arranged. The circumferential angle can also be 60 ° or 45 °, for example or even smaller become. This, that the indentation in an advantageous manner over the entire length the lower end area is present, the game is kept to a minimum reduced while ensuring a high load capacity.

The Cross-sectional narrowing This can be done either by cold and / or Be made of hot deformation. As cold deformation in particular embossing or compression.

By the hollow profile bar element according to the invention Is it possible, across from the hollow profile bars used since then a rod - with the same outer diameter - with less Use Wandungsdurchmesser, in particular higher material strengths be used. Especially the each successive end of the Hollow section bars influences the load-bearing capacity of the entire scaffolding system. A game in the field these shocks will by providing the cross-sectional taper in the mixed assembly of known hollow profile rods Reliable with the hollow profile bars according to the invention a minimum. The Simplicity of manufacture and assembly or disassembly will be maintained. Reduced by reducing the wall thickness the weight is clear. This leads to cost savings and relieved for the scaffolder the assembly or disassembly. Also with the mixing with known hollow profile rods as part of a scaffolding system Be so easily the load-bearing with the known Hollow profile bars built scaffolding systems reached.

A particularly advantageous embodiment is characterized in that the cross-sectional taper is made such that in the lower end portion of a mandrel, which has the inner contour of the hollow profile rod with cross-sectional taper in negative form, is introduced and then cold-formed over a set on the outer periphery matrix, the lower end portion. By this manufacturing measure, the tolerance values can be significantly improved. Usually, the rod supplied by the pipe manufacturer has tolerances in terms of wall thickness, ovalizations and weld bead thickening. Due to the illustrated production, these tolerances can be significantly reduced. This even leads to the extent that the permissible gap since then permissible for stacked hollow profile bars can be further reduced, which significantly increases the load capacity of the entire scaffolding system.

The have in a variety used known hollow profile rods a wall thickness of 3, 2 mm and are made of steel St37. With the hollow profile rod according to the invention Is it possible, the wall thickness preferred to 2.7 mm, without the carrying capacity of the scaffolding frames made of the hollow profile bars to reduce. So the hollow profile bar according to the invention can easily mounted in mixture with the already known hollow profile rods be without the ease of assembly suffers or the load capacity is reduced.

Prefers is the hollow profile rod as a vertical stem of a scaffold system or as a vertical stem of a scaffolding frame a scaffolding system educated.

One scaffolding frames according to the invention with two parallel spaced vertical stems below the upper end area by a cross bar and in the lower area connected by a cross bar, characterized by that as a vertical handle a hollow profile bar of the above-described Type is used. As a result, for example, a weight reduction of the frame weight from the LAYHER-Blitz scaffolding known scaffolding about 2 kg (kilograms) possible, without the load suffers.

Further embodiments and advantages of the invention will be apparent from the claims listed Features and by the embodiments given below. The features of the claims can be combined in any way as far as they are concerned not obviously mutually exclusive.

SHORT DESCRIPTION THE DRAWING

The Invention as well as advantageous embodiments and developments The same will be described below with reference to the drawings Examples closer described and explained. The The description and the drawing to be taken features can individually for themselves or applied to several in any combination according to the invention become. Show it:

1 schematic side view of scaffolding frames with vertical posts formed as hollow profile bars, arranged one above the other, but in an extended state,

2 schematic section through the end region with nested hollow profile rods,

3a schematic side view of a first embodiment of the detail E according to 1 .

3b schematic cross section along section II according to 3a .

4a schematic side view of a second embodiment of the detail E according to 1 .

4b schematic cross section along section II-II according to 4a .

5a schematic side view of a third embodiment of the detail E according to 1 .

5b schematic cross section along section III-III according to 5a and

5c schematic cross-section of the detail A in 5b ,

WAYS TO EXECUTE INVENTION

In the 1 in a side view illustrated three scaffolding frames 50 a scaffold system have a principle known structural design. There are two as hollow profile bars 10 trained, spaced vertical stems available as round tube profiles, in the upper area via an upper cross bar 14 connected to each other. In the corner between cross bars 14 and hollow profile bar 10 is each a gusset plate 18 shrink wrapped. Each hollow profile bar 10 points over the upper cross bar 14 going beyond an upper end region 20 on, which has a reduced outer diameter compared to the rest of the profile rod region such that this upper end region 20 in a lower end area 22 of the scaffolding frame above it 50 can be introduced. The lower end areas 22 two hollow profile bars 10 a scaffolding frame 50 are also by a lower cross bar 16 connected with each other. This constructively gives a total of a frame structure.

In 1 is the length of the upper end region 20 with EO and those of the lower end 22 with EU indicated. Both lengths are essentially the same size. The lower end area 22 is mounted on the upper end area during assembly 20 the underlying hollow profile bar 10 or scaffolding 50 to one below the upper end region 20 existing stop 24 of the hollow profile bar 10 attached.

2 shows schematically along the section AA in detail E according to 1 the nested condition of an upper end portion 20 and a lower end portion 22 , wherein the geometry of a hollow profile rod 10 with a predetermined outer diameter DA in the rod longitudinal region and a predetermined (reduced) outer diameter DR in the upper end region 22 has gone out, each determined or determined by the already known, on the market hollow profile bar.

Will now be a hollow profile bar 10 used, which has a smaller wall thickness t compared to the known hollow profile bars, wherein for compatibility reasons, the outer diameter DA and the outer diameter DR are maintained, created in the insertion region E is an enlarged gap SS between the inner wall of the lower end region 22 and the outer wall of the upper end portion 20 , This gap SS would normally result in increased clearance and overall would negatively affect the geometry and load capacity of the entire scaffolding system.

The Maintaining the outer diameter of the known scaffolding system guaranteed that even in the lower end - despite the cross-sectional taper - the usual Pipe coupling elements for Connection of additional scaffolding bars, for Example diagonals, can be used.

According to the invention, these negative effects are eliminated by the fact that in the lower end 22 Cross-sectional tapers are provided, of which embodiments in the following described 3 to 5 are shown.

According to 3a is in a first embodiment, the cross-sectional taper 30.1 as in the longitudinal direction, substantially over the entire length EU of the lower end region 22 running longitudinal stripes 30.1 formed, the indentation is chosen so large that an allowable gap width S is achieved. In the circumferential direction is the longitudinal strip 30.1 each offset by 90 ° (old).

A second embodiment is in 4 shown. The cross-sectional taper is here as a circumferential annular indentation 30.2 formed, each at the upper edge region and lower edge region of the lower end region 22 is available. Again, the annular indentation is formed so that between the inner wall of the annular indentation 30.2 with inserted upper end area 20 and the inner wall of the underlying hollow profile bar 10 an allowable gap S is present.

A third embodiment is in the 5a and 5b shown. The cross-sectional taper is as punctiform indentation 30.3 shown in the upper edge area as well as in the lower edge area of the lower end area 22 circumferentially in a grid of 90 ° before hand is. Again, the indentation depth of the punctiform depression 30.3 chosen so that between the inner wall and the outer wall of the upper end portion 20 the lower side hollow profile bar 10 an allowable gap is available.

The illustrated cross-sectional tapers represent only exemplary embodiments. Suitable cross-sectional tapers are all solutions which produce an allowable gap S and nevertheless provide a simple plug-on operation of adjacent hollow profile rods 10 or scaffolding 50 guarantee.

By the preferred preparation of the cross-sectional taper over an inserted mandrel and outside Pressing matrix can achieve much better tolerances as before. This leads to, that the previously allowed Gap S may be even lower, which has a positive effect on the Load of the scaffold system effect.

Claims (12)

Hollow profile rod ( 10 ) for a system framework with an upper end region ( 20 ), in particular pipe connectors, and a lower end region ( 22 ), wherein the hollow profile rod ( 10 ) has a defined outer diameter (DA) and a wall thickness (t), the outer diameter (DA) of the upper end region ( 20 ) relative to the outer diameter (DR) of the lower end region (FIG. 22 ), the upper end region ( 20 ) in the inserted state in the lower end region ( 22 ) of an adjacent hollow profile rod up to a stop ( 24 ) and between outer wall of the upper end region ( 20 ) and inner wall of the lower end region ( 22 ) an allowable gap dimension (S) is present, - the lower end region ( 22 ) of the hollow profile rod ( 10 ) at least partially at least one cross-sectional taper ( 30.1 . 30.2 . 30.3 ), such that between the inner wall of the lower end region ( 22 ) in the area of the cross section rejuvenation ( 30.1 , ...) in the case of hollow profiled bars attached or put together ( 10 ) and the outer wall of the upper plug-in area ( 20 ) of the attached hollow profile rod ( 10 ) the permissible gap dimension (S) or a smaller gap, characterized in that - the cross-sectional taper ( 30.1 ) is formed as extending in the longitudinal direction of the hollow profile bar strip-shaped indentation and - the cross-sectional tapering ( 30.1 ) in the circumferential direction of the hollow profile bar grid-shaped, in particular after a circumferential angle of each 90 ° (old degree), or 60 ° or 45 ° or smaller, is arranged. Hollow profile rod according to claim 1, characterized in that - the cross-sectional taper ( 30.1 , ...) is produced by cold and / or hot deformation. Hollow section bar according to claim 2, characterized in that - the cross-sectional taper is made such that in the lower end portion of a mandrel is introduced, which the inner contour of the hollow profile bar ( 10 ) having a cross-sectional taper in negative form, and then cold-formed over a set on the outer circumference matrix of the end portion. Hollow section bar according to claim 1 to 3, characterized in that - the cross-sectional taper ( 30.1 ) substantially over the entire length (EU) of the lower end region ( 22 ) of the hollow profile rod ( 10 ) runs. Hollow section bar according to one or more of the preceding Claims, thereby marked that - the Wall thickness of the hollow section bar in the range between 2.5 to 3.0 mm (millimeters) is, in particular, 2.7 mm (millimeters). Hollow section bar according to one or more of the preceding Claims, thereby marked that - of the Hollow profile bar consists of St52. Hollow section bar according to one or more of the preceding Claims, thereby marked that - of the Hollow profile bar is designed as a vertical stem of a scaffold system. Hollow section bar according to one or more of the preceding claims, characterized in that - the hollow profile bar ( 10 ) as a vertical stem of a scaffolding frame ( 50 ) is trained. Hollow section bar according to one or more of the preceding claims, characterized in that - the hollow profile bar ( 10 ) is designed as a round tube hollow profile. Hollow section bar according to one or more of the preceding claims, characterized in that - the length (EU) of the lower end area ( 22 ) with the cross-sectional taper ( 30.1 , ...) is in the range between 100 mm (millimeters) and 200 mm, in particular 150 mm. Hollow-section bar according to one or more of the preceding claims, characterized in that - the lower end area ( 22 ) has the defined outer diameter (DA) in the region outside the cross-sectional tapers. Scaffolding ( 50 ) with two parallel spaced vertical stems which are below the upper end region (FIG. 20 ) by a cross bar ( 14 ) and at the bottom by a cross bar ( 16 ) are connected, characterized in that - each vertical stem is formed as a hollow profile rod according to one or more of the preceding claims.