SE535989C2 - Compliant post and way of arranging road lighting - Google Patents

Abstract

Street lighting is positioned with lamp posts of sheet metal that have a round or polygonal cross-section and one or more longitudinal welded joints (17-20; 24). Posts are used that have one longitudinal welded butt joint with a weld that covers only a part of the sheet metal thickness and the posts are positioned so that this joint is directed towards the traffic.

Description

535 883 2 Figure 1 shows a lamp post composed of several tapered plates 11-14 which causes the post to taper conically upwards. The plates can be flat, but can also have longitudinal folds 15,16. The plates are joined with longitudinally welded joints 17-20. Figure 2 shows the joint 17 in magnification. The edges of the opposite plates 11,12 have chamfers 21,22 so that the abutment axes of the edges become smaller than the plate thickness and are welded together, preferably with laser welding, so that the thickness of the butt welds 23 across the plate becomes less than the plate thickness. The welds thus do not cover the entire sheet metal thickness.

They should not exceed ° /. of sheet metal thicknessvdvs have a thickness t, less than V. of sheet metal thickness t2 and they thus constitute weakenings which easily break if they are hit directly and allow the post to flatten and fold in the desired manner but the welds are strong enough not to be wind turbines.

Figure 3 shows a post which is roll-shaped in one piece so that it has only a longitudinal joint 24 which is made in the manner described with reference to fi figure 2. The post has been roll-formed in thin sheet metal with sheet metal thickness of 1-2 mm, e.g. , 5 mm, and it has a number of areas 25 with stiffening folds with triple sheet metal in the manner described in WO 2008/127168 to which reference is made. The stiffened areas 25 are strong against wind forces but allow the post to flatten in the event of a collision load. If the post has a polygonal cross-section, the stiffeners 25 can suitably be designed as corners as shown, but the post can alternatively have a circular cross-section.

The corners stiffened against wind forces are more easily deformed under impact load than the other corners in the polygon cross section and the joint 24 can suitably be made in one of the corners stiffened against wind forces. Lampposts according to figure 3 shall be placed along the road so that the joint 24 is directed towards the traffic.

Posts according to figure 1 have so many joints that they do not necessarily need to be positioned with a joint directly against the track. There will always be one or two of the joints that are directed towards the traffic, regardless of the rotational position of the posts in relation to the traffic. A roll-shaped post according to Figure 3 can also be rolled into several parts and, like the example in Figure 1, have longitudinal welds.

Claims (9)

00535989 Patent claim Flexible sheet metal post with polygonal or round cross-section with at least one longitudinally welded butt joint (17-20; 24), characterized in that the weld (23) has a smaller thickness across the sheet than the sheet thickness. Post according to claim 1, characterized in that the weld (23) has a thickness less than “A of the plate thickness Post according to Claim 1 or 2, characterized in that the edges (21, 22) against the weld are chamfered. Post according to one of the preceding claims, characterized in that the weld (23) is a laser weld. Post according to one of the preceding claims, characterized in that it is a lighting post by the road and has a longitudinally welded joint (17-20, 24) directed towards the traffic. Post according to Claim 5, characterized in that the lighting post is roll-shaped and has only one longitudinal joint (24). Method of arranging road lighting with metal lampposts having a round or polygonal cross-section and one or more longitudinally welded joints (17-20; 24), characterized by the use of poles having a longitudinally welded butt joint (17-20; 24) with a weld (23) that has a smaller thickness across the plate than the plate thickness and positions the posts so that this joint is directed towards the track. Method according to Claim 7, characterized in that posts with laser-welded joints with a welding thickness of less than 0/4 of the plate thickness are used. Method according to Claim 8, characterized in that posts which are rolled in one piece are used in such a way that they have only one longitudinal joint (24).