EP2689070B1 - Yielding post of thin sheet metal and method of arranging street lighting - Google Patents

Yielding post of thin sheet metal and method of arranging street lighting Download PDF

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Publication number
EP2689070B1
EP2689070B1 EP12760700.0A EP12760700A EP2689070B1 EP 2689070 B1 EP2689070 B1 EP 2689070B1 EP 12760700 A EP12760700 A EP 12760700A EP 2689070 B1 EP2689070 B1 EP 2689070B1
Authority
EP
European Patent Office
Prior art keywords
sheet metal
post
posts
joint
weld
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP12760700.0A
Other languages
German (de)
French (fr)
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EP2689070A1 (en
EP2689070A4 (en
EP2689070B9 (en
Inventor
Fredrik MOBERG
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Northcone AB
Original Assignee
Northcone AB
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Publication date
Application filed by Northcone AB filed Critical Northcone AB
Priority to PL12760700T priority Critical patent/PL2689070T3/en
Publication of EP2689070A1 publication Critical patent/EP2689070A1/en
Publication of EP2689070A4 publication Critical patent/EP2689070A4/en
Application granted granted Critical
Publication of EP2689070B1 publication Critical patent/EP2689070B1/en
Publication of EP2689070B9 publication Critical patent/EP2689070B9/en
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Classifications

    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
    • E01F9/00—Arrangement of road signs or traffic signals; Arrangements for enforcing caution
    • E01F9/60—Upright bodies, e.g. marker posts or bollards; Supports for road signs
    • E01F9/623—Upright bodies, e.g. marker posts or bollards; Supports for road signs characterised by form or by structural features, e.g. for enabling displacement or deflection
    • E01F9/631—Upright bodies, e.g. marker posts or bollards; Supports for road signs characterised by form or by structural features, e.g. for enabling displacement or deflection specially adapted for breaking, disengaging, collapsing or permanently deforming when deflected or displaced, e.g. by vehicle impact
    • E01F9/635—Upright bodies, e.g. marker posts or bollards; Supports for road signs characterised by form or by structural features, e.g. for enabling displacement or deflection specially adapted for breaking, disengaging, collapsing or permanently deforming when deflected or displaced, e.g. by vehicle impact by shearing or tearing, e.g. having weakened zones

Definitions

  • the invention relates to yielding posts of sheet metal that have a round or polygonal cross-section and one or more longitudinal welded joints.
  • the invention also relates to a method of arranging street lighting with yielding posts.
  • Lamp posts along roads shall now be yielding and decelerate a colliding vehicle over a fairly long distance. This is achieved if the posts bend backwards over the vehicle, so that the entire post is deformed when the vehicle continues forwards.
  • Conical posts are known from WO 2008/127168 that are roll-formed and have a welded longitudinal joint. Such roll-formed posts can be produced from such a small sheet metal thickness that they bend on collision in spite of being very sturdy against wind forces. Tall posts have such a large diameter at the bottom, however, that they can offer undesirably great resistance before they bend.
  • GB 396 745 A discloses a post consisting of metal plates or rolled metal sections with one or more longitudinal welded butt joints.
  • An object of the invention is to ensure that the post bends backwards when run into. Another object is to make the production of the post simpler and faster and more reliable.
  • posts are used that have a longitudinal welded butt joint with a weld that is thinner than the sheet metal thickness and the posts are positioned so that this joint is directed towards the traffic.
  • the invention is defined by claim 1 and claim 6, respectively.
  • FIG 1 shows a lamp post composed of several tapering metal sheets 11-14, which means that the post tapers conically upwards.
  • the sheets can be flat, but can also have longitudinal folds 15, 16.
  • the sheets are joined together by longitudinal welded joints 17-20.
  • Figure 2 shows the joint 17 enlarged.
  • the edges of the opposing sheets 11, 12 have bevels 21, 22, so that the contact surfaces of the edges are smaller than the sheet metal thickness and are welded together, preferably by laser welding, so that the thickness of the butt welds 23 across the sheet is smaller than the sheet metal thickness.
  • the welds do not cover the whole sheet metal thickness. They should cover at most % of the sheet metal thickness, i.e.
  • Figure 3 shows a post that is roll formed from one piece so that it has only one longitudinal joint 24 that is executed in the manner described with reference to figure 2 .
  • the post has been roll formed in thin sheet metal with a sheet metal thickness of 1-2 mm, e.g. 1.5 mm, and it has a number of areas 25 with stiffening folds with threefold 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 be flattened in the event of crash loading. If the post has a polygonal cross-section, the stiffenings 25 can expediently be formed as corners as shown, but the post can alternatively have a circular cross-section.
  • the corners stiffened against wind forces are deformed more easily in the event of crash loading than the other corners in the polygonal cross-section and the joint 24 can expediently be executed in one of the corners stiffened against wind forces.
  • Lamp posts according to figure 3 should 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 facing the traffic. There are always one or two of the joints that are directed towards the traffic, regardless of the rotary position of the posts in relation to the traffic.
  • a roll-formed post according to figure 3 can also be roll formed in several parts and like the example in figure 1 have several longitudinal welds.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Road Signs Or Road Markings (AREA)

Description

    Technical field
  • The invention relates to yielding posts of sheet metal that have a round or polygonal cross-section and one or more longitudinal welded joints. The invention also relates to a method of arranging street lighting with yielding posts.
    • Background of the invention
  • Lamp posts along roads shall now be yielding and decelerate a colliding vehicle over a fairly long distance. This is achieved if the posts bend backwards over the vehicle, so that the entire post is deformed when the vehicle continues forwards. Conical posts are known from WO 2008/127168 that are roll-formed and have a welded longitudinal joint. Such roll-formed posts can be produced from such a small sheet metal thickness that they bend on collision in spite of being very sturdy against wind forces. Tall posts have such a large diameter at the bottom, however, that they can offer undesirably great resistance before they bend.
  • GB 396 745 A discloses a post consisting of metal plates or rolled metal sections with one or more longitudinal welded butt joints.
    • Object of the invention
  • An object of the invention is to ensure that the post bends backwards when run into. Another object is to make the production of the post simpler and faster and more reliable.
    • Brief description of the invention
  • According to the invention, posts are used that have a longitudinal welded butt joint with a weld that is thinner than the sheet metal thickness and the posts are positioned so that this joint is directed towards the traffic. The invention is defined by claim 1 and claim 6, respectively.
    • Brief description of the drawings
    • Figure 1 shows the cross-section of a lamp post as an example of the invention.
    • Figure 2 shows the circled part of figure 1 enlarged.
    • Figure 3 shows another example of the invention in cross section.
    Description of the example shown of the invention
  • Figure 1 shows a lamp post composed of several tapering metal sheets 11-14, which means that the post tapers conically upwards. The sheets can be flat, but can also have longitudinal folds 15, 16. The sheets are joined together by longitudinal welded joints 17-20. Figure 2 shows the joint 17 enlarged. The edges of the opposing sheets 11, 12 have bevels 21, 22, so that the contact surfaces of the edges are smaller than the sheet metal thickness and are welded together, preferably by laser welding, so that the thickness of the butt welds 23 across the sheet is smaller than the sheet metal thickness. Thus the welds do not cover the whole sheet metal thickness. They should cover at most % of the sheet metal thickness, i.e. have a thickness t1 less than ¾ of the sheet metal thickness t2 and they thereby form weaknesses that give way easily if they are run into directly and allow the post to be flattened out and bend in the desired manner, but the welds are sufficiently strong not to constitute weaknesses in relation to wind forces. By making a weld that does not cover the sheet metal thickness, the welding can be carried out faster and still be more reliable. The current can be reduced and altogether, the production will be faster at a reduced cost.
  • Figure 3 shows a post that is roll formed from one piece so that it has only one longitudinal joint 24 that is executed in the manner described with reference to figure 2. The post has been roll formed in thin sheet metal with a sheet metal thickness of 1-2 mm, e.g. 1.5 mm, and it has a number of areas 25 with stiffening folds with threefold 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 be flattened in the event of crash loading. If the post has a polygonal cross-section, the stiffenings 25 can expediently be formed as corners as shown, but the post can alternatively have a circular cross-section.
  • The corners stiffened against wind forces are deformed more easily in the event of crash loading than the other corners in the polygonal cross-section and the joint 24 can expediently be executed in one of the corners stiffened against wind forces. Lamp posts according to figure 3 should 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 facing the traffic. There are always one or two of the joints that are directed towards the traffic, regardless of the rotary position of the posts in relation to the traffic. A roll-formed post according to figure 3 can also be roll formed in several parts and like the example in figure 1 have several longitudinal welds.

Claims (8)

  1. Yielding post of thin sheet metal with a polygonal or round cross-section with at least one longitudinal welded joint (17-20; 24), characterised in that the joint is a longitudinal welded butt joint, and in that the weld (23) has a smaller thickness across the sheet metal than the sheet metal thickness and covers at most % of the sheet metal thickness.
  2. Post according to claim 1, characterised in that the edges (21, 22) facing the weld are bevelled.
  3. Post according to any of the preceding claims, characterised in that the weld (23) is a laser weld.
  4. Post according to any of the preceding claims, characterised in that it is a lighting post by the road and has the at least one longitudinal welded joint (17-20, 24) intended to be directed towards the traffic.
  5. Post according to claim 4, characterised in that the lighting post is roll formed and has only one longitudinal welded joint (24).
  6. Method of arranging street lighting with yielding lamp posts of sheet metal that have a round or polygonal cross-section and one or more longitudinal welded joints (17-20; 24), characterised in that posts are used that have one longitudinal welded butt joint (17-20; 24) with a weld (23) that has a smaller thickness across the sheet metal than the sheet metal thickness and covers at most % of the sheet metal thickness, wherein the posts are positioned so that this joint is directed towards the traffic.
  7. Method according to claim 6, characterised in that posts are used with a laser welded joint
  8. Method according to claim 7, characterised in that posts are used that are roll formed in one piece so that they have only one longitudinal welded joint (24).
EP12760700.0A 2011-03-23 2012-03-22 Yielding post of thin sheet metal and method of arranging street lighting Active EP2689070B9 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL12760700T PL2689070T3 (en) 2011-03-23 2012-03-22 Yielding post of thin sheet metal and method of arranging street lighting

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE1100211A SE535989C2 (en) 2011-03-23 2011-03-23 Compliant post and way of arranging road lighting
PCT/SE2012/000041 WO2012128693A1 (en) 2011-03-23 2012-03-22 Yielding post of thin sheet metal and method of arranging street lighting

Publications (4)

Publication Number Publication Date
EP2689070A1 EP2689070A1 (en) 2014-01-29
EP2689070A4 EP2689070A4 (en) 2014-11-12
EP2689070B1 true EP2689070B1 (en) 2016-10-12
EP2689070B9 EP2689070B9 (en) 2017-08-16

Family

ID=46879605

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12760700.0A Active EP2689070B9 (en) 2011-03-23 2012-03-22 Yielding post of thin sheet metal and method of arranging street lighting

Country Status (8)

Country Link
US (1) US20140000180A1 (en)
EP (1) EP2689070B9 (en)
DK (1) DK2689070T3 (en)
ES (1) ES2610757T3 (en)
PL (1) PL2689070T3 (en)
PT (1) PT2689070T (en)
SE (1) SE535989C2 (en)
WO (1) WO2012128693A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB201212888D0 (en) * 2012-07-19 2012-09-05 Signpost Solutions Ltd Support assembly
DE102016205447A1 (en) * 2016-04-01 2017-10-05 Innogy Se Support structure for a wind turbine
DE102019101330A1 (en) * 2019-01-18 2020-07-23 Innogy Se Support structure for a wind turbine

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB396745A (en) * 1932-02-03 1933-08-03 Aubrey Frederic Burstall Improvements in and relating to hollow metal structures such as masts, poles, and crane jibs
US3217459A (en) * 1962-09-17 1965-11-16 Roy E Meyer Tower structure
US3936206A (en) * 1975-02-18 1976-02-03 Bruce-Lake Company Tubular pole slip joint construction
SE446640B (en) * 1983-04-08 1986-09-29 Lars Svensson POST consisting of a weakened metal bearing profile made of metal
US4724975A (en) * 1986-06-18 1988-02-16 Cbi Research Corporation High-pressure structure made of rings with peripheral weldments of reduced thickness
DE9202757U1 (en) * 1992-03-02 1992-10-29 König, Reinhard, Dr.-Ing., 7505 Ettlingen mast
NO316629B1 (en) * 2001-09-28 2004-03-15 Euromast As Connecting device for masts, posts and similar bar structures
US20050252160A1 (en) * 2004-05-12 2005-11-17 Jerry Miller Method of forming joints of non-cylindrical tubing
US20080250752A1 (en) * 2007-04-12 2008-10-16 Hapco Aluminum Pole Products Embeddable breakaway utility pole
SE531195C2 (en) * 2007-04-13 2009-01-13 Ortic 3D Ab Resilient post and way to manufacture such
BE1017649A7 (en) * 2007-06-15 2009-03-03 Safety Product Nv ROAD SAFE POLE.
DE602007002179D1 (en) * 2007-06-20 2009-10-08 Siemens Ag Wind turbine tower and method of constructing a wind turbine tower
US20100058673A1 (en) * 2007-08-31 2010-03-11 Mitsubishi Heavy Industries Ltd Tubular-member flange coupling
AU2008229948B2 (en) * 2008-10-15 2016-08-11 Plasgain Pty Ltd An Impact Absorbing Pole

Also Published As

Publication number Publication date
DK2689070T3 (en) 2017-01-30
SE535989C2 (en) 2013-03-19
PT2689070T (en) 2017-01-04
SE1100211A1 (en) 2012-09-24
US20140000180A1 (en) 2014-01-02
EP2689070A1 (en) 2014-01-29
EP2689070A4 (en) 2014-11-12
EP2689070B9 (en) 2017-08-16
WO2012128693A1 (en) 2012-09-27
ES2610757T3 (en) 2017-05-03
PL2689070T3 (en) 2017-06-30

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