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
  • E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
  • E04C3/08—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal with apertured web, e.g. with a web consisting of bar-like components; Honeycomb girders
  • E04C3/09—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal with apertured web, e.g. with a web consisting of bar-like components; Honeycomb girders at least partly of bent or otherwise deformed strip- or sheet-like material
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21D47/00—Making rigid structural elements or units, e.g. honeycomb structures
  • B21D47/01—Making rigid structural elements or units, e.g. honeycomb structures beams or pillars
• • 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
  • E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
  • E04C2003/0486—Truss like structures composed of separate truss elements
• • 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
  • E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
  • E04C2003/0486—Truss like structures composed of separate truss elements
  • E04C2003/0491—Truss like structures composed of separate truss elements the truss elements being located in one single surface or in several parallel surfaces
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T29/00—Metal working
  • Y10T29/18—Expanded metal making
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T29/00—Metal working
  • Y10T29/49—Method of mechanical manufacture
  • Y10T29/49616—Structural member making
  • Y10T29/49623—Static structure, e.g., a building component
  • Y10T29/49625—Openwork, e.g., a truss, joist, frame, lattice-type or box beam
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T29/00—Metal working
  • Y10T29/49—Method of mechanical manufacture
  • Y10T29/49616—Structural member making
  • Y10T29/49623—Static structure, e.g., a building component
  • Y10T29/49634—Beam or girder

Definitions

• the present invention relates to a method for making a supporting crossbar construction and to a crossbar construction made according to the method. More specifically the invention relates to a method for making a supporting crossbar construction of thin plate.
• US patent 3 034 197 discloses a method for making crossbar constructions from a thin plate reel by cutting elongated slits in the longitudinal direction of the plate and then expanding the plate in the transverse direction.
• US patent 3 298 081 discloses a similar method for making crossbar constructions as US 3 034 197, however in this case the cutted platebars are bent outwards from the plane of the plate before expanding in the transverse direction.
• the supporting crossbar construction is made from thin plate on a reel, in a contiuously running line with punching and roll-forming machines.
• Crossbar beams provide a favorable distribution of the material mass into an upper and lower frame, and makes a maximum use of the strength of the material.
• An advantage of the present invention is that the hight of the new crossbar construction easily can be changed. Bigger beam hight means better bearing strength without increasing the material consumption for the construction. This is an improvement as compared for instance to the previously known light beam.
• Another advantage of the present invention is that the construction requires neither welding joints nor bolt joints.
• Still another advantage of the present invention is that the fabrication requires no subsequent treatment. This is especially true when anti-corrosive treated thin plate, such as Aluzinc, is used.
• Another advantage of the present invention is that very little wastage will be produced and material saving is high as compared to todays technology. Material costs are decisive for the economy in thin plate manufacturing, and in the manufacturing method according ' to the present invention relatively thin plate can be used due to a stiffening bending technic.
• the raw material used is preferably 0,8-2,5 mm steel plate, e.g. Dobels Aluzinc 350 YP, supplyed on reels.
• Fig.l discloses a production line for manufacturing of a crossbar beam for light constructions and a trapezoidal crossbar construction.
• Fig.2 discloses a punching station in the production line according to fig.l.
• Fig.3 discloses a station in the production line of fig.l for bending the plate into a circular arc.
• Fig.4 discloses a first roll-forming station in the production line of fig.l for making a crossbar beam.
• Fig.5 discloses a further product machining step in the production line of fig.l for making a crossbar beam.
• Fig.6 discloses a first roll-forming station in the production line of fig.l for making a trapezoidal crossbar construction.
• Fig.7 discloses assembling of several elements of fig.6 for making a trapezoidal crossbar construction.
• Fig.8 discloses a production line for making a crossbar beam for larger bearing distances.
• Fig.9 discloses a punching station in the production line of fig.8.
• Fig.10 discloses a first roll-forming station in the production line of fig.8.
• Fig.11 discloses a station in the production line of fig.8 for bending the plate into a circular arc.
• Fig.12 discloses a second roll-forming station in the production line of fig.8.
• Fig.13 discloses a turning station in the production line of fig.8.
• Fig.14 discloses still another roll-forming station in the production line of fig.8.
• Fig.15 discloses a further product machining step in the product line of fig.8 for producing a crossbar beam for larger bearing distances.
• Fig.l discloses an overview over a production line for making a crossbar beam A according to a first embodiment of the present invention and for making a trapezoidal crossbar construction W according to a second embodiment of the invention.
• the supply plate is fed directly from a coiling reel la through a punching station or a punching machine lb, where the plate is punched and bent according to a given pattern.
• the machined plate is fed to a path 24 forming a circular arc.
• the plate is fed to a station 21 preferably comprising a roll-forming machine and further to a finishing station 23 to produce a crossbar beam A, as a final product.
• the manufacturing of the trapezoidal crossbar construction W is started similarily as for the crossbar beam A, by feeding and machinig the plate in the first part 20 of the production line. Then the plate is fed to a roll-forming station 22 and is thereafter worked into a finished product, to be described later.
• Fig.2 discloses the punching station lb of fig.l, or more specifically the result of punching or cutting and bending the plate in the station.
• the apparatus for performing the punching and bending is, however not shown. This apparatus may be conventional and does not constitute a specific part of the present invention.
• a punching machine or a similar machine has punched or cut out five longitudinal plate fields 2a-2e.
• substantially the first and the fifth field 2a, 2e will form the upper frame, the third field 2c the lower frame and the second and fourth field 2b, 2d intermediate diagonal bars.
• Fig.2 discloses three cutted bars 30-32 in the second field 2b and three bars 33-35 in the fourth field 2d.
• a bar 30 is made by the punching machine punching or cutting two substantially parallel, longitudinal, line formed apertures or slits 41 and 42 and two inclined transversal slits 43 «_nd 44.
• the bar 30 has an unbroken plate connection via a lap 2f, at the upper slit 43, with the first field 2a, and via a similar lap 2f, at the lower slit 44, with the third field 2c.
• the bar edges 45-48 are bent into a substantially C-profile or similar shape in order to make the diagonal bars rigid.
• the ends of the longitudinal slits 41 and 42 are so shaped that the laps 2f get a suitable form.
• a line drawn between the the upper end point of the slit 44 and the lower end point of the slit 42 will form an angle of 60 degrees with the longitudinal direction of the slit 42.
• the lower transversal slit 44 of the diagonal bar 30 constitutes the upper transversal slit of the subsequent bar 31.
• Fig.3 discloses in detail the circular path 24.
• the plane plate fields 2a, 2e and 2c respectively for the upper and lower frames are curved in a circular arc of 180°.
• the diagonal bars 30-35, which are rigid due to their C-shaped profile, continue however in their horizontal state, and the joining plate laps 2f are therefore bowed 180° in a line with an angle of 60° towards the upper and lower frame.
• Section B-B 1:5 in the middle of fig.3 discloses the section B-B in the right half of the figure and the same section in fig.l.
• Fig.4 discloses the further passing of the plate material through the roll-forming station or machine 21.
• the two upper frame halfs 2a, 2e and the parallel diagonal bars 2b, 2d are passed in an arc of 90° + 90° to the same plane, however with an opposite inclination for the diagonal bars 2b and 2d respectively.
• the upper frame plates 2a and 2e are bent into L-profiles 4c and 4b, and the lower frame plate 2c into a T-profile.
• the sections B-B to E-E correspond to the same sections in fig.l.
• Fig.5 discloses details made in the finishing station 23.
• the L-profiles 4b and 4c are folded together into a T- profile 5a.
• the laps 5b are bent over adjacent plate flanges which are locked in this position.
• the lower frame 5d is turned up towards the upper frame 5a. This turning angle defines the desired beam length.
• the surface of the turning point is reinforced with a plate 5e, which is screwed or bolted to the upper and lower frame.
• the result will be a statically stable crossbar A.
• the beginning of the production line for making the trapezoidal crossbar construction W in accordance with a second embodiment of the invention, comprises the same part 20 of the production line as for the crossbar beam A in the first embodiment shown in figures 1-3.
• fig.6 discloses the input section H-H and output section I-I for the plate material.
• the lower frame 6a and the two upper frame halfs 6b, 6c are bent into U-profiles 6f, 6g, 6h with the diagonal bars 6d, 6e having an inclination of abt. 60°.
• a trapezoidal cross section is formed in which the inclination for the diagonal bars 6d and 6e are opposite in view of the frames 6f, 6h, 6g.
• a plurality of such elements can be assembled by bolting or screwing together the upper frames as shown in fig.7, forming a stable crossbar construction . The forces in the cross direction of the construction are transferred to steady fastening points or are stabilized by a crossbar or disk material 7a, fastened to the upper frames.
• Fig.8 discloses an overview over a production line for making a crossbar beam B for larger bearing distances, in accordance with a third embodiment of the invention.
• a coiling reel la the plate is fed through a combined punching and bending station lb to a roll-forming station 61, further to a station 62 for bowing the plate into a circular arc and then to another roll-forming station
• Fig.9 discloses in detail the result of the punching and bending operations performed in the punching station lb in fig.8.
• the punching machine has punched or cut longitudinal slits 75 and 76 which devide the plate into three longitudinal plate fields 9a, 9b, 9c.
• the fields 9a and 9b will form the upper and lower frames whereas the field 9c will form the diagonal bars, of which a first bar 71 and a second bar 72 is shown in the figure.
• a substantially transverse slit 77 separates bars 71 and 72 from each other.
• Each bar has an unbroken plate connection to the adjacent plate fields via an upper and a lower lap 9k, equal to the laps 2f in fig.2.
• the short bar side flanges 9d and a number of auxiliary laps 9e-9i are bent into a suitable angle, as shown in fig. 9-11 and fig.15.
• Fig.10 discloses the result of the plate material passing the roll-forming machine 61.
• the diagonal bars are bent into a square C-profile 10a simultaneously with the turnover of the plate fields 9a and 9b abt. 90° into two parallel planes.
• Fig.11 discloses the feeding of the plate in the substantially circular path 62, see fig.8, so that the angle between the incident line and the outgoing line is abt. 60°.
• the diagonal bars 71, 72 which are rigid due to their tube formed cross section, follow the original direction of the line.
• the connecting plate lap 9k is bent 60°.
• the end laps 9i are bent over the lap 11a to lock the diagonal bars in this position.
• Fig.12 discloses the plate material path in the new direction through the second roll-forming station 63.
• the upper and the lower frames are bent into L-profiles 12a, 12b in the various stages, sections L-L, M-M, N-N and 0-0.
• the first half of the beam When the first half of the beam has left the roll-forming station, it is turned 180° in the turning station 64, fig.13, and the diagonal bars are then getting an inclination in the opposite direction. Simultaneously the second beam half is rolling in from the the roll-forming station and is joined with the first half, section P-P.
• the two halves By means of roll-forming in the roll-forming station 65, fig.14 and fig.15, the two halves are folded together into tube profiles with T-flanges, section S-S, T-T and U-U. Finishing of the ends is made in the end station 66 in a same way as for the crossbar beam A, whereby a crossbar beam B for larger bearing distances is produced as an end product.

Landscapes

• Engineering & Computer Science (AREA)
• Architecture (AREA)
• Civil Engineering (AREA)
• Structural Engineering (AREA)
• Mechanical Engineering (AREA)
• Bending Of Plates, Rods, And Pipes (AREA)
• Rod-Shaped Construction Members (AREA)
• Lining And Supports For Tunnels (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=20381851

Family Applications (1)

Country Status (4)

Families Citing this family (6)

Citations (8)

Family Cites Families (4)

• 1991
  • 1991-02-08 SE SE9100390A patent/SE470008B/sv not_active IP Right Cessation
• 1992
  • 1992-02-06 WO PCT/SE1992/000071 patent/WO1992013658A1/en not_active Application Discontinuation
  • 1992-02-06 US US08/104,070 patent/US5845379A/en not_active Expired - Fee Related
  • 1992-02-06 EP EP92904782A patent/EP0696941A1/en not_active Withdrawn

Patent Citations (8)

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