SCAFFOLD CROSS-BAR AND STACK ARRANGEMENT OF AT LEAST TWO SCAFFOLD CROSS-BARS

Abstract

A scaffold cross-bar of metal with a round-tube carrier profile of steel includes a round tube and has an outside diameter, and a U-shaped reinforcing profile of steel sheet. The U-shaped reinforcing profile has a base profile and two parallel profile legs which extend away from the base profile in the same direction at a transverse spacing from one another. Each profile leg has at least one opening for fastening and/or securing scaffold components on the scaffold cross-bar. The transverse spacing of the profile legs is smaller than 0.6 times the outside diameter of the round-tube carrier profile.

Claims

1. Scaffolding bar of metal with an elongate rod-shaped round-tube girder profile member (21) of steel and an elongate U reinforcing profile member (22) of sheet steel, with the following features: the round-tube girder profile member (21) extends in the direction of a first longitudinal axis (23) in a first longitudinal direction (24), has, as considered in the first longitudinal direction (24), a girder profile member length (26) and a girder profile member longitudinal center (24), has an outer diameter (28) substantially constant over its girder profile member length (26), has, as considered in an installed setting (30) of the scaffolding bar (20), an upper support edge (31) for support and/or suspension of a scaffolding covering (39) or a plurality of scaffolding coverings (39) and comprises two girder profile member ends (25.1, 25.2) facing away from one another in opposite directions in the first longitudinal direction (24); either a respective separate connecting head (32) of metal for detachable fastening of the scaffolding bar (20) in the installed setting (30) to a fastening element (34), which is provided with at least one passage (33.1, 33.2), of a scaffolding element (36) by means of a connecting wedge (35) insertable through the passage (33.1, 33.2) is fixedly welded to each girder profile member end (25.1, 25.2) of the girder profile member ends (25.1, 25.2) or a respective hook-shaped suspension claw or suspension catch of metal, which is downwardly open as considered in each instance in the installed setting, for detachable support and/or suspension of the scaffolding bar in the installed setting on and/or at suspension components is fixedly welded to each girder profile end of the girder profile ends; the U reinforcing profile member (22) extends away from the round-tube girder profile member (21) to underneath the round-tube girder profile member (21) in the installed setting, extends in the direction of a second longitudinal axis (43) in a second longitudinal direction (44) parallel to the round-tube girder profile member (21) and/or parallel to the first longitudinal axis (23) thereofwith bridging-over of the girder-profile member longitudinal center (27)along the round-tube girder profile member (21) continuously over a reinforcing profile member length (45) corresponding with at least half the girder profile member length (26) of the round-tube girder profile member (21), has two reinforcing profile member ends (47.1, 47.2) facing away from one another in opposite directions in the second longitudinal direction (44), has, as considered in a cross-section extending perpendicularly to the second longitudinal axis (43), a U-shaped cross-section (48), is formed with a base profile (49), which extends in the second longitudinal direction (44) and from which two lateral profile limbs (50.1, 50.2) extending in the second longitudinal direction (44) extend away in the same direction upwardly as considered in the installed setting (30) and substantially parallel to one another at a transverse spacing (52) and in the direction of a profile limb axis (51), which is vertical in the installed setting (30), and have fastening ends (55.1, 55.2) fixedly welded to an outer wall of the round-tube girder profile member (21) and has a reinforcing profile member width (52) corresponding with the transverse spacing (52) and a reinforcing profile member height (56), which corresponds with the spacing (56) of the fastening ends (55.1, 55.2) from the base profile (49) and which is greater than the reinforcing profile member width (52) and than the outer diameter (28) of the round-tube girder profile member (21); a first profile limb (50.1) of the two lateral profile limbs (50.1, 50.2) is provided with a first passage (60.1) for fastening and/or securing scaffolding components; the first passage (60.1) is arranged at a first longitudinal spacing (61.1) from a first reinforcing profile member end (47.1) of the two reinforcing profile member ends (47.1, 47.2) of the U reinforcing profile member (22) and at a second longitudinal spacing from a second reinforcing profile member end (47.2) of the two reinforcing profile member ends (47.1, 47.2) of the U reinforcing profile member (22), has a first passage length (64) as considered in the second longitudinal direction (44) and has a first passage height (63) which is smaller than the reinforcing profile member height (56); a second profile limb (50.2) of the two lateral profile limbs (50.1, 50.2) is provided with a second passage (60.2) for fastening and/or securing scaffolding components; the second passage (60.2) is arranged at a third longitudinal spacing from the first reinforcing profile member end (47.1) of the U reinforcing profile member (22) and at a fourth longitudinal spacing from the second reinforcing profile member end (47.2), has a second passage length (64) as considered in the second longitudinal direction (44) and has a second passage height (63) smaller than the reinforcing profile member height (56); the transverse spacing (52), which corresponds with the reinforcing profile member width (52) of the U reinforcing profile member (22), of the two lateral profile limbs (50.1, 50.2) extending substantially parallel to one another is less than 0.6 times the outer diameter (28) of the round-tube girder profile member (21).

2. Scaffolding bar according to claim 1, wherein the transverse spacing (52), which corresponds with the reinforcing profile member width (52) of the U reinforcing profile member (22), of the two lateral profile limbs (50.1, 50.2) extending substantially parallel to one another is less than 0.5 or 0.45 times the outer diameter (28) of the round-tube girder profile member (21).

3. Scaffolding bar according to claim 1, wherein the first passage (60.1) of the first profile limb (50.2) and the second passage (60.2) of the second profile limb (50.2) are arranged at substantially the same height with respect to the U reinforcing profile member (22).

4. Scaffolding bar according to claim 1, wherein the first passage (60.1) of the first profile limb (50.1) and the second passage (60.2) of the second profile limb (50.2) are bounded by the outer wall of the round-tube girder profile member (21).

5. Scaffolding bar according to claim 1, wherein the first passage (60.1) of the first profile limb (50.1) as considered in a viewing direction perpendicular to a plane (65) containing the first longitudinal axis (23) and the second longitudinal axis (43) either at least partly overlaps the second passage (60.2) of the second profile limb (50.2) or is substantially aligned with the second passage (60.2).

6. Scaffolding bar according to claim 1, wherein the first profile limb (50.1) of the U reinforcing profile member (22) has in the region of the first passage (60.1) a first profile limb height (66) which is greater than half the reinforcing profile member height (56) and wherein the second profile limb (50.2) of the U reinforcing profile member (22) has in the region of the second passage (60.2) a second profile limb height (66) which is greater than half the reinforcing profile member height (56).

7. Scaffolding bar according to claim 1, wherein the first passage height (63) of the first passage (60.1) of the first profile limb (50.1) and the second passage height (63) of the second passage (60.2) of the second profile limb (50.2) are each smaller than half the reinforcing profile member height (56).

8. Scaffolding bar according to claim 1, wherein the first profile limb height (66) of the first profile limb (50.1) of the U reinforcing profile member (22) is greater than 1.0, 1.2 or 1.4 times the first passage height (63), of the first passage (60.1) of the first profile limb (50.1) and/or wherein the second profile limb height (66) of the second profile limb (50.2) of the U reinforcing profile member (22) is greater than 1.0, 1.2 or 1.4 times the second passage height (63) of the second passage (60.2) of the second profile limb (50.2).

9. Scaffolding bar according to claim 1, comprising the following further features: the first profile limb (50.1) of the U reinforcing profile member (22) is provided with at least one third passage (60.3) for fastening and/or securing scaffolding components, the third passage (60.3) is arranged at a first passage longitudinal spacing (62.1) from the first passage (60.1) as considered in the second longitudinal direction (44), is arranged at a fifth longitudinal spacing from the first reinforcing profile member end (47.1) and at a sixth longitudinal spacing (61.6) from the second reinforcing profile member end (47.2), has a third passage length as considered in the second longitudinal direction (44) and has a third passage height (63) smaller than the reinforcing profile member height (56); the second profile limb (50.2) of the U reinforcing profile member (22) is provided with at least one fourth passage for fastening and/or securing scaffolding components; the fourth passage is arranged at a second passage longitudinal spacing from the second passage (60.2) as considered in the second length direction (44), is arranged at a seventh longitudinal spacing from the first reinforcing profile member end (47.1) of the U reinforcing profile member (22) and at an eighth longitudinal spacing from the second reinforcing profile member end (47.2) of the U reinforcing profile member (22), has a fourth passage length as considered in the second longitudinal direction (44) and has a fourth passage height (63) smaller than the reinforcing profile member height (56).

10. Scaffolding bar according to claim 1, wherein each passage (60.1, 60.2, 60.3) as considered in the second longitudinal direction (44) is constructed to be longitudinal or elongate and/or is formed to be rectangular.

11. Scaffolding bar according to claim 1, wherein the two lateral profile limbs (50.1, 50.2), which extend substantially parallel to one another, of the U reinforcing profile member (22) are arranged symmetrically with respect to a longitudinal plane (65) of symmetry containing the first longitudinal axis (23) and the second longitudinal axis (43).

12. Scaffolding bar according to claim 1, wherein the U reinforcing profile member (22) is formed symmetrically with respect to a or the longitudinal plane (65) of symmetry containing the first longitudinal axis (23) and the second longitudinal axis (43).

13. Scaffolding bar according to claim 1, wherein the U reinforcing profile member (22) is produced by flanging, bending over and/or profiling a plate-shaped or strip-shaped steel sheet on a rolling train and/or wherein the base profile (49) of the U reinforcing profile member (22) is curved outwardly away from the round-tube girder profile member (21) and has a semi-circular cross-section as considered in a cross-section perpendicular to the second longitudinal axis (43).

14. Stack arrangement of at least two scaffolding bars comprising a first scaffolding bar (20; 20.1) according to claim 1 and at least one second scaffolding bar (20; 20.1), wherein the round-tube girder profile member (21) of the second scaffolding bar (20.2) bears against or rests on one profile limb (50.1) of the two substantially parallel profile limbs (50.1, 50.2) of the U reinforcing profile member (22) of the first scaffolding bar (20.1) and wherein the U reinforcing profile member (22) of the second scaffolding bar (20.2) bears or rests by one profile limb (50.1) of its two substantially parallel profile limbs (50.1, 50.2) against or on the round-tube girder profile member (21) of the first scaffolding bar (20.1).

15. Stack arrangement according to claim 14, wherein the first scaffolding bar (20; 20.1) and the second scaffolding bar (20; 20.1) are formed to be the same.

Description

[0030] Further advantages, features and aspects of the invention can be inferred from the following description section, in which a preferred embodiment of the invention is described on the basis of the figures and in which:

[0031] FIG. 1 shows a three-dimensional illustration of a scaffolding bar, which is mounted in an installed setting at the apertured discs of two scaffolding posts of a scaffolding, and installed scaffolding floors;

[0032] FIG. 2 shows a side view of the scaffolding bar, wherein for illustration of the installed setting thereof and the mounting thereof on the two scaffolding posts the latter are illustrated with the apertured discs thereof in dot-dashed lines;

[0033] FIG. 3 shows the scaffolding bar in a plan view from above;

[0034] FIG. 4 shows a cross-section, to substantially enlarged scale, of the scaffolding bar along the section line 4-4 in FIGS. 2 and 3, without illustration of the connecting heads; and

[0035] FIG. 5 shows a possible stack arrangement of two scaffolding bars.

[0036] The scaffolding bar 20 of metal comprises, as fundamental element, an elongate rod-shaped round-tube girder profile member 21 of, preferably galvanised, steel and an elongate U reinforcing profile member 22 of, preferably galvanised, sheet steel.

[0037] The round-tube girder profile member 21 consists of a substantially straight and substantially circularly cylindrical round tube. The round-tube girder profile member 21 extends in the direction of a first longitudinal axis 23 in a first longitudinal direction 24 and has two girder profile member ends 25.1, 25.2 facing away from one another in opposite directions in the first longitudinal direction. The round-tube girder profile member 21 has, as considered in the first longitudinal direction 24, a girder profile member length 26 and a girder profile member longitudinal centre 27 as well as an outer diameter 28 which is substantially constant over its girder profile member length 26. The round-tube girder profile member 21 has a substantially constant girder profile member wall thickness 29 over substantially its entire girder profile member length 26 or over substantially its entire girder profile member circumference. The round-tube girder profile member 21 has a support edge 31, which is upper as considered in an installed setting 40 of the scaffolding bar 20, for support and/or suspension of a scaffolding covering 39 or a plurality of scaffolding coverings 39. A respective separate connecting head 32 of metal, particularly of malleable cast iron, grey cast iron, cast steel or steel, for detachable fastening of the scaffolding bar 20 in the installed setting 30 to a fastening element 34, which is provided with at least one passage 33.1, 33.2, of a scaffolding element 36 by means of a connecting wedge 35 insertable through the at least one passage 33.1, 33.2 is fixedly welded to each girder profile member end 25.1, 25.2 of the girder profile member ends 25.1, 25.2.

[0038] As illustrated in FIGS. 1 to 3, the scaffolding bar 20 can be fastened by way of each of its two connecting heads 32, 32 in a mode and manner known per se to a respective apertured disc 34 of a scaffolding post 36 with the help of a respective connecting wedge 35. As similarly shown therein, several scaffolding floors 39 can be fixed, adjacent to one another as considered in the first longitudinal direction 24, to or on the scaffolding bar 20 in a mode and manner similarly known per se, for example by means of the illustrated suspension hooks or claws 37.

[0039] The U reinforcing profile member 22 extends in the direction of a second longitudinal axis 43 in a second longitudinal direction 44 parallel to the round-tube girder profile member 21 or parallel to the first longitudinal axis 23 thereofwith bridging-over of the girder profile member longitudinal centre 27continuously along the round-tube girder profile member 21 over a reinforcing profile member length 45 corresponding with at least half the girder profile member length 26 of the round-tube girder profile member 21. In the illustrated embodiment, the girder profile member length 26 is approximately 940 millimetres and the reinforcing profile member length 45 approximately 720 millimetres. The U reinforcing profile member 21 is arranged to be centrally centred relative to the round-tube girder profile member 21 as considered in the first longitudinal direction 24. Accordingly, the round-tube girder profile member 21 extends by each of its girder profile member ends 25.1, 25.2, as considered in the first longitudinal direction 24, out beyond the respective reinforcing profile member end 47.1, 47.2 of the U reinforcing profile member 22. In the illustrated example the respective girder profile member end 25.1, 25.2 of the round-tube girder profile member 21 has a spacing 46 in each instance from the respectively associated reinforcing profile member end 47.1, 47.2 of the U reinforcing profile member 22 as considered in the first longitudinal direction 24. This spacing 46 is preferably approximately 110.0 millimetres. However, it will be obvious that the spacing can also be smaller or larger. The U reinforcing profile member 22 is a profile member which is straight with respect to the second longitudinal direction 44. The U reinforcing profile member 22 has two reinforcing profile member ends 47.1, 47.2 facing away from one another in opposite directions. The U reinforcing profile member 22 extends away from the round-tube girder profile member 21, in the installed setting 30 to below the round-tube girder profile member 21. The U reinforcing profile member 22 has, as considered in a cross-section extending perpendicularly to the second longitudinal axis 43, a U-shaped cross-section 48 (see, in particular, FIG. 4). The U reinforcing profile member 22 comprises a base profile 49 extending rectilinearly in the second longitudinal direction 44 and two lateral profile limbs 50.1, 50.2. The profile limbs 50.1. 50.2 extend away from the base profile 49 in the same direction, which is upward as considered in the installed setting, at a transverse spacing 52 from one another and substantially parallel to one another in the direction of a profile limb axis 51 which is vertical in the installed setting 30. The base profile 49 is curved outwardly away from the round-tube girder profile member 21, i.e. convexly, with formation of an inner radius 53 or with an inner radius 53. The inner radius 53 is, for example, 7 millimetres. In a cross-section considered perpendicularly to the second longitudinal axis 44 the base profile 49 has a semi-circular cross-section 54. The two lateral profile limbs 50.1, 50.2 extend in the second longitudinal direction 44 substantially parallel to one another. A first profile limb 50.1 of the two profile limbs 50.1, 50.2 has a first fastening end 55.1 facing away from the base profile 49. A second profile limb 50.2 of the two profile limbs 50.1, 50.2 has a second fastening end 55.2 facing away from the base profile 49. The first fastening end 55.1 of the first profile limb 50 has a first spacing 56 from the base profile 49 and the second fastening end 55.2 of the second profile limb 50.2 has a second spacing from the base profile 49, the second spacing being the same size as the first spacing 56. Each profile limb 50.1, 50.2 of the two profile limbs 50.1, 50.2 is fixedly welded by its fastening end 55.1, 55.2, which faces away from the base profile 49, to the circularly cylindrical outer wall 38 of the round-tube girder profile member 21. The outer wall 38 can also be termed outer circumferential wall. The two profile limbs 50.1, 50.2 extend, as considered in a cross-section perpendicular to the second longitudinal axis 43, parallel to one another at the transverse spacing 52. The U reinforcing profile member 22 has a U reinforcing profile member width 52 corresponding with the transverse spacing 52 and a reinforcing profile member height 56 corresponding with the spacing 56 of the fastening ends 55.1, 55.2 from the base profile 49. The reinforcing profile member height 56 is greater than the reinforcing profile member width 52 and is also greater than the outer diameter 28 of the round-tube girder profile member 21.

[0040] The transverse spacing 52 of the two lateral profile limbs 50.1, 50.2, which extend substantially parallel to one another or the reinforcing profile member width 52 of the U reinforcing profile member 22 is or are smaller than 0.6 times the outer diameter 28 of the round-tube girder profile member 21. In the illustrated embodiment the transverse spacing 52 or the U reinforcing profile member width 52 is approximately 20.0 millimetres. The outer diameter 28 of the round-tube girder profile member 21 is approximately 48.3 millimetres. Accordingly, in the illustrated embodiment the quotient or the ratio of the transverse spacing 52 or the U reinforcing profile member width 52 and the outer diameter 28 of the round-tube girder profile member 21 is approximately 0.41. The wall thickness of the round-tube girder profile member 29 is here approximately 2.7 millimetres. The wall thickness 57 of the profile limbs 50.1, 50.2 of the U reinforcing profile member 22 is here approximately 3.0 millimetres.

[0041] The first profile limb 50.1 of the two lateral profile limbs 50.1, 50.2 is provided with two elongate rectangular passages 60.1, 60.3, which each extend in the second longitudinal direction 44, for fastening and/or securing scaffolding components; which are not shown in the figures. A first passage 60.1 of the two passages 60.1, 60.3 is arranged at a first longitudinal spacing 61.1 from the first reinforcing profile member end 47.1 of the U reinforcing profile member 22 and at a second longitudinal spacing from the second reinforcing profile member end 47.2 of the two U reinforcing profile member ends 47.1, 47.2 of the U reinforcing profile member 22. The other passage 60.3, which is also termed third passage, of the two passages 60.1, 60.3 of the first profile limb 50.1 is arranged at a fifth longitudinal spacing, which substantially corresponds with the second longitudinal spacing, from the first reinforcing profile member end 47.1 and at a sixth longitudinal spacing 61.6, which substantially corresponds with the first longitudinal spacing 61.1, from the second reinforcing profile member end 47.2. The first passage 60.1 and the other or third passage 60.3 are arranged at a first passage longitudinal spacing 62.1 from one another at substantially the same height and are each boundedupwardly in the installed setting 30by the outer wall 38, which is straight as considered in the first longitudinal direction 24, of the round-tube girder profile member 21.

[0042] The second profile limb 50.2 of the two lateral profile limbs 50.1, 50.2 is also provided with two elongate rectangular passages 60.2, which each extend in the second longitudinal direction 44, for fastening and/or securing scaffolding components (not shown in the figures) or the said scaffolding components. One passage of these two passages, which is also termed second passage 60.2, is arranged at a third longitudinal spacing, which substantially corresponds with the first longitudinal spacing 61.1, from the first reinforcing profile member end 47.1 of the U reinforcing profile member 22 and is arranged at a fourth longitudinal spacing, which substantially corresponds with the second longitudinal spacing, from the second reinforcing profile member end 47.2. The other passage of these two passages 60.2, which is also termed fourth passage, is arranged at a seventh longitudinal spacing, which substantially corresponds with the fifth or second longitudinal spacing, from the first reinforcing profile member end 47.1 of the U reinforcing profile member 22. Moreover, the fourth passage is arranged at an eighth longitudinal spacing, which substantially corresponds with the sixth or first longitudinal spacing, from the second U reinforcing profile member end 47.2 of the U reinforcing profile member 22. The one passage or the second passage 60.2 and the other passage or fourth passage are arranged at a second passage longitudinal spacing from one another at the same height and are each bounded, upwardly in the installed setting 30, by the outer wall 38, which is straight as considered in the first longitudinal direction 24, of the round-tube girder profile member 21. The second passage longitudinal spacing is substantially the same size as the first passage longitudinal spacing 62.1. The first passage longitudinal spacing 62.1 and the second passage longitudinal spacing are here each approximately 34 millimetres. The first, third, sixth and eighth longitudinal spacings are here each approximately 80 millimetres. The second, fourth, fifth and seventh longitudinal spacings are here each approximately 377 millimetres.

[0043] Each of the four passages 60.1, 60.2, 60.3 has, as considered in a direction perpendicular to the second longitudinal direction 44, a passage height 63 of substantially the same size and, as considered in a second longitudinal direction 44, a passage length 64 of substantially the same size. The respective passage length 64 is here approximately 263 millimetres. However, it will be obvious that each passage, particularly in the case of longer scaffolding bars, can also have a different passage length, for example approximately 158 millimetres or approximately 286 millimetres or approximately 478 millimetres. In addition, it will be obvious that each profile limb can also have more than two passages, in particular three to eight passages. If each profile limb has more than two passages, the passages closest to the respective reinforcing profile member ends preferably have a passage length respectively corresponding with the passage length 64, thus approximately 263 millimetres.

[0044] Each of the four passages 60.1, 60.2, 60.3 has a passage cross-section of substantially the same size. The passage height 63 of each passage 60.1, 60.2, 60.3 is smaller than the reinforcing profile member height 56. As considered in a viewing direction perpendicular to a plane 65 containing the first longitudinal axis 23 and the second longitudinal axis 43 not only are the first passage 60.1 of the first profile limb 50.1 and the second passage 60.2 of the second profile limb 50.2 in alignment, but also the third passage 60.3 of the first profile limb 50.1 and the fourth passage of the second profile limb 50.2 are respectively arranged to be substantially congruent or arranged as a respective pair to be substantially congruent. Each of the four passages 60.1, 60.2, 60.3 is, as considered in a viewing direction perpendicular to the plane or longitudinal plane of symmetry 65 containing the first longitudinal axis 23 and the second longitudinal axis 43, bounded or enclosed over the whole circumference by wall parts of the respective profile limb 50.1, 502 of the U reinforcing profile member 22 and by a wall part of the outer wall 38 of the round-tube girder profile member 21.

[0045] The two profile limbs 50.1, 50.2 of the U reinforcing profile member 22 each have in the region of the passages 60.1, 60.3; 60.2 thereof a profile limb height 66 which is of substantially the same size and which is larger than half the reinforcing profile member height 56. Accordingly, the respective passage height 63 of the passages 60.1, 60.3; 60.2 of the two profile limbs 50.1, 50.2 of the U reinforcing profile member 22 is in each instance smaller than half the reinforcing profile member height 56. The passage heights 63 of the passages 60.1, 60.3; 60.2 are of substantially the same size. In the illustrated embodiment the respective passage height 63 is approximately 30.0 millimetres. The profile limb height 66, which the profile limbs 50.1, 50.2 of the U reinforcing profile member 22 each have in the region of the passages 60.1, 60.3; 60.2, is here approximately 43.0 millimetres. In the illustrated embodiment, the reinforcing profile member height 56 is approximately 73.0 millimetres.

[0046] In the illustrated embodiment the scaffolding bar 20 is configured or formed symmetrically with respect to a longitudinal plane 65 of symmetry, which contains the first longitudinal axis 23 and the second longitudinal axis 43 and also symmetrically with respect to a transverse plane 67 of symmetry containing the girder profile member longitudinal centre 27 of the round-tube girder profile member 21. Accordingly, the U reinforcing profile member 22 and thus also the two lateral profile limbs 50.1, 50.2, which extend substantially parallel to one another, of the U reinforcing profile member 22 are configured or formed symmetrically with respect to the longitudinal plane 65 of symmetry and also symmetrically with respect to the transverse plane 67 of symmetry. The two profile limbs 50.1, 50.2, which are formed and arranged symmetrically with respect to the longitudinal plane 65 of symmetry, of the U reinforcing profile member 22 of the scaffolding bar 20 extend parallel to one another on either side of the longitudinal plane 65 of symmetry and thus on either side of a profile limb axis 51, which is formed perpendicularly to the second longitudinal axis 43, of the U reinforcing profile member 22.

[0047] The two profile limbs 50.1, 50.2 of the U reinforcing profile member 22 are each arranged to be offset by the fastening ends 55.1, 55.2 thereof laterally relative to the longitudinal plane 65 of symmetry by an identical spacing corresponding with half the transverse spacing 52 or half the U reinforcing profile member width 52. Accordingly, the profile limbs 50.1, 50.2 of the U reinforcing profile member 22 are not seatedand thus neither is the U reinforcing profile member 22at the lowest point of the round-tube girder profile member 21 in the installed setting 30, but are offset from the centre point 40 of the round-tube girder profile member 21 or from the longitudinal plane 25 of symmetry to both sides. Thus, an effective reinforcing profile member height 68, which is slightly smaller by a spacing or an amount 69 than the reinforcing profile member height 56, results and an effective passage height 70, which is smaller by the same spacing or amount 69 than the respective passage height 63, of the respective passage 60.1, 60.3; 60.2 results. The effective reinforcing profile member height 68 is here approximately 71.96 millimetres. The effective passage height 70 is here approximately 28.96 millimetres. Accordingly, the effective reinforcing profile member height 68 is reduced by comparison with the reinforcing profile member height 56 by the spacing or amount 69 of approximately 1.04 millimetres. The scaffolding bar 20 therefore has an overall height 71 corresponding with the sum of the outer diameter 28 of the round-tube girder profile member 21 and the effective reinforcing profile member height 68. The overall height 71 is here calculated to be approximately 120.26 millimetres (see FIG. 4). In addition, the effective passage height 70 is reduced by comparison with the passage height 63 by the amount 69 of approximately 1.04 millimetres.

[0048] The U reinforcing profile member 22 is preferably produced by flanging, bending over and or profiling a plate-shaped or strip-shaped, preferably flat-plane, steel sheet or steel-sheet semi-finished product (not shown in the figures) about a single flanging or bending axis on a rolling train.

[0049] The scaffolding bar 20 according to the invention offers an advantageous possibility for the fastening of accessory components which are, in particular, already present and which are not shown in the figures, particularly standardised, preferably integrated, couplings in a length region of the round-tube girder profile member 21, in which the U reinforcing profile member 22 also extends, and/or for an anti-lift-off securing of at least one scaffolding floor 39, which rests on or is suspended at the round-tube girder profile member 21 and which is, in particular, present, by means of a securing bar (not shown in the figures) which is at the underside of the or the respective scaffolding floor 39 and pivotable relative thereto about a pivot axis arranged transversely, particularly perpendicularly, to the work surface of the scaffolding floor 39.

[0050] A stack arrangement 75 of two scaffolding bars 20 according to the invention, comprising a first scaffolding bar 20.1 and a second scaffolding bar 20.2, is shown in FIG. 5. The first scaffolding bar 20.1 and the second scaffolding bar 20.2 are of the same form. In other words, the stack arrangement shows two identical scaffolding bars 20.

[0051] In the stack arrangement 75 shown in FIG. 5 the second scaffolding bar 20.2 is arranged to be turned relative to the first scaffolding bar 20.1 through 180 degrees about the first longitudinal axis 23 of the first scaffolding bar 20.1 in such a way that as considered in a cross-section perpendicular to the first or second longitudinal axis 23 or 43 of the first scaffolding bar 20.1, the ends 76, which are formed or bounded by the respective base profile 49 of the respective U reinforcing profile member 22, of the respective U reinforcing profile member 22 face away from one another in opposite directions or that the U reinforcing profile member 22 of the first scaffolding bar 20.1 faces away from the round-tube girder profile member 21 thereof and the reinforcing profile member 22 of the second scaffolding bar 20.2 faces away from the round-tube girder profile member 21 thereof in opposite directions.

[0052] The round-tube girder profile member 21 of the second scaffolding bar 20.2 lies against or on a profile limb 50.1 of the two substantially parallel profile limbs 50.1, 50.2 of the U reinforcing profile member 22 of the first scaffolding bar 20.1 and the U reinforcing profile member 22 of the second scaffolding bar 20.2 lies by one profile limb 50.1 of its two substantially parallel profile limbs 50.1, 50.2 against or on the round-tube girder profile member 21 of the first scaffolding bar 20.1 so that the profile limb axis 51 of the U reinforcing profile member 22 of the second scaffolding bar 20.2 and the profile limb axis 51 of the U reinforcing profile member 22 of the first scaffolding bar 20.1 extend approximately parallelly (see FIG. 5). A stack arrangement 75 of that kind is particularly space-saving or makes possible a particularly space-saving storage by stacking of the at least two scaffolding bars 20; 20.1, 20.2 according to the invention against or on one another. The profile limb axis 51 of the first scaffolding bar 20.1 and the profile limb axis 51, which is parallel thereto, of the second scaffolding bar 20.2 have a stack spacing 77 from one another which is 0.5 times or half the sum of the outer diameter 28 of the respective round-tube girder profile member 21 and the reinforcing profile member width 52 of the respective U reinforcing profile member 22 or of the transverse spacing 52 of the respective profile limbs 50.1, 50.2 of the respective U reinforcing profile member 22. In the illustrated embodiment the said stack spacing 77 is approximately only 34.15 millimetres.

REFERENCE NUMERAL LIST

[0053] 20 scaffolding bar [0054] 20.1 (first) scaffolding bar [0055] 20.2 (second) scaffolding bar [0056] 21 round-tube girder profile member/round tube [0057] 22 U reinforcing profile member [0058] 23 first longitudinal axis of 21 [0059] 24 first longitudinal direction [0060] 25.1 (first) girder profile member end [0061] 25.2 (second) girder profile member end [0062] 26 girder profile member length [0063] 27 girder profile member longitudinal centre [0064] 28 outer diameter of 21 [0065] 29 (girder profile member) wall thickness [0066] 30 installed setting [0067] 31 (upper) support edge of 21 [0068] 32 connecting head [0069] 33.1 passage [0070] 33.2 passage [0071] 34 fastening element/rosette/apertured disc [0072] 35 connecting wedge [0073] 36 scaffolding element/scaffolding post [0074] 37 suspension hook/suspension claw [0075] 39 scaffolding covering/scaffolding floor [0076] 40 centre point [0077] 43 second longitudinal axis of 22 [0078] 44 second longitudinal direction [0079] 45 reinforcing profile member length [0080] 46 spacing (110) [0081] 47.1 (first) reinforcing profile member end/longitudinal end [0082] 47.2 (second) reinforcing profile member end/longitudinal end [0083] 48 U-shaped cross-section [0084] 49 base profile [0085] 50.1 (first) profile limb [0086] 50.2 (second) profile limb [0087] 51 profile limb axis [0088] 22 transverse spacing/reinforcing profile member width [0089] 53 inner radius [0090] 54 (semi-circular) cross-section [0091] 55.1 (first) fastening end of 50.1 [0092] 55.2 (second) fastening end of 50.2 [0093] 56 spacing/U profile member height [0094] 57 (reinforcing profile member) wall thickness [0095] 60.1 (first) passage [0096] 60.2 (second) passage [0097] 60.3 (third) passage [0098] 61.1 (first) longitudinal spacing [0099] 61.6 (sixth) longitudinal spacing [0100] 62.1 (first) passage longitudinal spacing [0101] 63 passage height [0102] 64 passage length [0103] 65 (longitudinal) plane (of symmetry) [0104] 66 profile limb height [0105] 67 (transverse) plane (of symmetry) [0106] 68 effective reinforcing profile member height [0107] 69 spacing/amount [0108] 70 effective passage height [0109] 71 overall height [0110] 75 stack arrangement [0111] 76 stack spacing