Classifications

• • E—FIXED CONSTRUCTIONS
  • E04—BUILDING
  • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
  • E04C3/00—Structural elongated elements designed for load-supporting
  • E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
  • E04C3/29—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces built-up from parts of different material, i.e. composite structures
• • 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
  • E01F15/00—Safety arrangements for slowing, redirecting or stopping errant vehicles, e.g. guard posts or bollards; Arrangements for reducing damage to roadside structures due to vehicular impact
  • E01F15/02—Continuous barriers extending along roads or between traffic lanes
  • E01F15/025—Combinations of at least two of the barrier member types covered by E01F15/04 - E01F15/08, e.g. rolled steel section or plastic strip backed up by cable, safety kerb topped by rail barrier
• • 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
  • E01F15/00—Safety arrangements for slowing, redirecting or stopping errant vehicles, e.g. guard posts or bollards; Arrangements for reducing damage to roadside structures due to vehicular impact
  • E01F15/02—Continuous barriers extending along roads or between traffic lanes
  • E01F15/04—Continuous barriers extending along roads or between traffic lanes essentially made of longitudinal beams or rigid strips supported above ground at spaced points
  • E01F15/0407—Metal rails
  • E01F15/0423—Details of rails

Definitions

• the present invention relates to a section bar of light metal which is designed to take up heavy loads, par ⁇ ticularly shock loads, and which for example can be used as a load carrying beam in structural work or as a bearing beam in road railings.
• the main object of the invention is to provide a stif- fened section bar of light metal which has a higher strength and admissible load than prior section bars of light metal and which, for example when used in road rail ⁇ ings, can be substantially deformed without breaking, so that it can take up the loads which can arise in connection with traffic accidents.
• the section bar of light metal comprises at least one core which is embedded in the sec ⁇ tion bar and which consists of a material having a higher tensile strength than the light metal used in the section bar, a substantial increase of the strength of the section bar is obtained without a corresponding increase of the weight or manufacturing costs of the section bar.
• the core of the section bar which may consist of a steel wire
• the section bar is further so designed that it is deformed during a shock load, before the core is exposed to maximum load, the section bar obtains properties making it very suitable for use as bearing beam in road railings.
• the bearing beam shown on the drawing consists of an extruded section bar of aluminium provided with two arcuate edge portions 10,11 which are connected by means of a cent- ral portion 12.
• the central portion 12 forms the back side of the section bar, and the arcuate edge portions 10,11 project forward from the central portion 12 and form the front side of the section bar.
• the edge portions 10,11 have a substantially U-shaped cross section with two legs 10A.10B and 11A.11B, respectively, and a base 10C and 11C, respectively.
• the central portion 12 is connected to the edge portions 10,11 along the edges of the legs 10B and 11B, respectively.
• the section bar is designed with a hollow projection 13 along the connection between the central portion 12 and the edge portion 11.
• the hollow projection has a longitudi ⁇ nal hole 14 in which a steel wire 15 is positioned.
• the projection 13 runs along the whole section bar in the long ⁇ itudinal direction of the section bar, and the steel wire 15 is completely embedded in the projection.
• the steel wire is positioned in the section bar of aluminium during the extrusion of the bar, so that the material of the bar enga- ges in the grooves between the parts of the steel wire, thus anchoring the steel wire in the section bar along the full lenght of the bar.
• the connecting legs 10B and 11B, respectively, of the U-shaped edge portions 10,11 form an obtuse angle ⁇ with the connecting central portion 12.
• This feature will provi ⁇ de a deformation of the section bar in case of a shock load on the front side, i. e. on the projecting edge portions 10,11.
• This deformation occurs by svinging the legs 10B,11B around the central portion 12.
• the deformation is provided before the steel wire is exposed to maximum load, and the ⁇ refore a vehicle, which for example in connection with a traffic accident is thrown against the bearing beam, is slowed down by the bearing beam in a somewhat flexible way, so that the risk of injuries to the person or persons tra ⁇ velling in the vehicle is to some extent reduced.
• the flex ⁇ ibility also entails that the strain on the steel wire and the attachment points is reduced which makes it possible to obtain a sufficient strength of the bearing beam by means of a comparatively thin wire and smaller means of attach ⁇ ment.
• Such a flexibility can not be obtained by conventio ⁇ nal bearing beams of steel or concrete and is a further advantage of the section bar of light metal according to the invention when used as bearing beam in road railings.
• the steel wire is embedded in the corner between the central portion 12 and the leg 11B of the edge portion 11, so that the steel wire is spaced from the central line 15 of the section bar. This will make ' the steel wire more efficacious than if it had been positioned on the central line of the section bar.
• the edge por ⁇ tions 10 and 11 will be positioned on either side of the steel wire. Therefore, both edge portions 10,11 will be deformed in about the same way in case of an appearing shock load which will give a maximum flexibility of the section bar.
• the section bar and possibly also the steel wire are attached at the ends to the posts of the road railing or to other convenient supports by means of conventional means of attachment (not shown). While only one embodiment of the section bar has been shown on the drawing and described above, it is evident that many different embodiments and variations are possible within the scope of the invention. It is for example pos ⁇ sible to replace the steel wire by a core of. another type, for example a bar which can have any cross section.
• the core can be embedded in the section bar either at the manu ⁇ facturing of the section bar or later when it can be pushed into the hollow 'projection of the section bar and attached to the section bar at a number of points.
• two or more cores may be embedded in the sec ⁇ tion bar.
• the cores are preferably positioned in the outer edges of the section bar, because the effect of the cores increases with the distance to the central line of the section bar.
• the section bar can also be designed otherwise than with two arcuate edge portions, for example with a single arcuate portion which than may extend in front of the core or the cores embedded in the section bar.
• the section bar according to the invention has been described in connection with road railings, but the bar can also be used in connection with other mechanical load sup- porting constructions, and the section bar has advantages, even if the load to be carried is not a shock load. In this case it is not necessary that the section bar is designed to be deformed when loaded.
• the section bar may be manufac ⁇ tured of other light metals than aluminium, and the core or cores do not need to be steel wires or steel bars. Also other materials having higher tensile strength than the light metal can be used.

Landscapes

• Engineering & Computer Science (AREA)
• Architecture (AREA)
• Civil Engineering (AREA)
• Structural Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Composite Materials (AREA)
• Refuge Islands, Traffic Blockers, Or Guard Fence (AREA)
• Bridges Or Land Bridges (AREA)
• Materials For Medical Uses (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=20358219

Family Applications (1)

Country Status (6)

Cited By (3)

Families Citing this family (1)

Citations (5)

Family Cites Families (1)

• 1984
  • 1984-12-19 SE SE8406451A patent/SE446220B/sv not_active IP Right Cessation
• 1985
  • 1985-12-16 GB GB08617253A patent/GB2180862B/en not_active Expired
  • 1985-12-16 DE DE19853590666 patent/DE3590666T1/de not_active Withdrawn
  • 1985-12-16 WO PCT/SE1985/000523 patent/WO1986003820A1/en active Application Filing
• 1986
  • 1986-08-18 NO NO863317A patent/NO164058C/no unknown
  • 1986-08-19 DK DK394486A patent/DK153102C/da not_active IP Right Cessation

Patent Citations (5)

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