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
  • 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
  • E04C3/291—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces built-up from parts of different material, i.e. composite structures with apertured web
• • 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
• • 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
  • E04C2003/0404—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects
  • E04C2003/0408—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by assembly or the cross-section
  • E04C2003/0413—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by assembly or the cross-section being built up from several parts
• • 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
  • E04C2003/0404—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects
  • E04C2003/0426—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by material distribution in cross section
  • E04C2003/0434—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by material distribution in cross section the open cross-section free of enclosed cavities
• • 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
  • E04C2003/0404—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects
  • E04C2003/0443—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by substantial shape of the cross-section
  • E04C2003/0465—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by substantial shape of the cross-section square- or rectangular-shaped
• • 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
  • E04C2003/0495—Truss like structures composed of separate truss elements the truss elements being located in several non-parallel surfaces

Definitions

• the invention relates to a method of manufacturing a truss beam.
• Truss beams are commonly made either of steel or of composite material, steel beams are strong but are very heavy and thus awkward to handle. Comparatively strong beams of composite material are produced in sections using a tool which inevitably increases the cost of manufacture. Furthermore, such beams of composite material have large solid sections which cause the beams to be undesirably heavy.
• the invention seeks to provide a strong, lightweight truss beam which is easy and cheap to manufacture.
• the flexible elements are wound around the carcase such that the edges of the spacer members are contacted by the same some flexible elements between adjacent elongate members.
• each flexible element is fixed to the carcase at each point of contact therebetween.
• the elongate members are tubular.
• the elongate members are of a composite material comprising thermosetting or thermoplastics resin and fibres.
• the materials used are selected such that their modulii of elasticity, Poisson's ratios and densities have values of the same order.
• each flexible element is electrically conductive material and preferably has a coating of a thermoplastics material.
• the flexible elements are made to adhere to the carcase by passing an electrical current therethrough.
• the spacing of the elongate members of a beam produced according to the method described above allows a beam of low mass per unit length to be produced.
• the flexible elements contact the elongate members in the plane of each spacer member in order to press the elongate members towards the spacer members and retain a close fit therebetween.
• the beam thus produced then behaves as a single member for mechanical purposes: the flexible elements carry the majority of any stresses which are applied to the beam.
• the beam is therefore strong and lightweight. It may also be manufactured in substantial lengths, rather than in sections
• Fig. 1 is a perspective view of three spacer members arranged along a tube or shaft
• Fig. 2 is a perspective view of a carcase comprising the spacer members and shaft of Fig. 1 and further tubes arranged in a predetermined manner;
• Fig. 3 is a perspective view of the carcase of Fig. 2 with a first wire wound around the tubes;
• Fig. 4 is a perspective view of the carcase of Fig. 3 with a second wire wound around the tubes.
• the method according to the invention begins with the manufacture of the carcase 1.
• Spacer members 2 of a composite material of gla ⁇ sfibres and a thermoplastics resin are spaced at equal intervals along a shaft or tube 3.
• the shaft or tube 3 is arranged on a vertically rotatable turntable to increase the accessibility of the beam during manufacture.
• Elongate members in the form of tubes 4 also of a similar composite material are then arranged in predetermined positions in relation to the spacer members 2.
• a plurality of wires 5 is then wound in a predetermined pattern around the carcase 1. This pattern may be a spiral pattern.
• Each tube 4 is contacted by a wire 5 in the plane of each spacer member 2.
• the edges of each spacer member 2 are crossed by a wire 5 between adjacent tubes 4.
• Further wires 5' are then added to increase the stability and strength of the beam.
• the further wires 5' are also wound in a spiral pattern, preferably rotating in the opposite direction to the first wires 5.
• the further wires 5' also contact the tubes 4 in the plane of each spacer member 2 and the edges of the spacer members 2 are each crossed by a wire 5* between adjacent tubes 4.
• Each of the wires 5,5' has a core of electrically conducting material and a coating of a thermoplastics material.
• the wires 5, 5' are made to adhere to the carcase 1 by passing a current through the core such that the thermoplastics coating is melted.
• the thermoplastics resin of the composite material of the tubes 4 and spacer members 2 is also melted in the region adjacent each point of contact with the wires 5,5'. When the current is cut off and the wires 5,5' cool, the thermoplastics resin sets joining the wire 5,5' to the tubes 4 and the spacer members 2.
• elongate members described above are . tubular, it would be equally acceptable to utilise solid bars of relatively lightweight construction or tubular members filled with foam or synthetic material. Different arrangements of elongate members around the spacer members are possible: the arrangement shown in the representations is by way of example only. The invention is not limited to elongate members of composite material - it is envisaged that elongate members comprising thin-walled steel or aluminium tubes would also be suitable.
• the flexible elements may be wires, lines or bands of steel or other metal, or could comprise non-metallic materials of high tensile strength such as carbon- or glass-reinforced resin.
• the flexible elements may have a coating of a plastics material and may be adhered to the carcase by means other than those described above, e.g. by direct application of heat to to thermoplastics coating.
• the fexible elements may be fixed to the carcase at either end of the beam or at periodical intervals.
• the fixing may take any suitable form, e.g. by tying, welding or repeated winding. Patterns other than spirals may be used, provided that the elongate members are contacted by the flexible elements in the plane of each spacer member.
• thermoplastics resin which may be used for the elongate members and the coating of the wires is that known in Sweden as "Aramid”. Nylon could also be used. This is by way of example only.
• a single flexible element refers to a wire of the like running from one end of the beam to the other. It would, of course, be possible to arrange for successively wound flexible elements to be connected end to end and wound back and forth along the beam.

Landscapes

• Engineering & Computer Science (AREA)
• Architecture (AREA)
• Civil Engineering (AREA)
• Structural Engineering (AREA)
• Composite Materials (AREA)
• Chemical & Material Sciences (AREA)
• Rod-Shaped Construction Members (AREA)
• Laminated Bodies (AREA)
• External Artificial Organs (AREA)
• Glass Compositions (AREA)
• Inorganic Insulating Materials (AREA)
• Diaphragms For Electromechanical Transducers (AREA)
• Slide Fasteners, Snap Fasteners, And Hook Fasteners (AREA)
• Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
• Mechanical Treatment Of Semiconductor (AREA)
• Superconductors And Manufacturing Methods Therefor (AREA)
• Lining Or Joining Of Plastics Or The Like (AREA)
• Manufacture Of Motors, Generators (AREA)
• Moulding By Coating Moulds (AREA)
• Electronic Switches (AREA)
• Control Of El Displays (AREA)
• Ropes Or Cables (AREA)

Priority Applications (7)

Applications Claiming Priority (2)

Publications (1)

Family

ID=10615530

Family Applications (1)

Country Status (13)

Cited By (4)

Families Citing this family (1)

Citations (4)

• 1987
  • 1987-04-09 GB GB08708500A patent/GB2204614A/en active Pending
• 1988
  • 1988-04-09 CN CN8888102214A patent/CN88102214A/zh active Pending
  • 1988-04-11 DE DE8888903297T patent/DE3867235D1/de not_active Expired - Fee Related
  • 1988-04-11 JP JP63503063A patent/JPH03500068A/ja active Pending
  • 1988-04-11 AU AU15779/88A patent/AU616887B2/en not_active Ceased
  • 1988-04-11 WO PCT/GB1988/000279 patent/WO1988008064A1/en active IP Right Grant
  • 1988-04-11 EP EP88903297A patent/EP0355103B1/en not_active Expired - Lifetime
  • 1988-04-11 BR BR888807454A patent/BR8807454A/pt unknown
  • 1988-04-11 AT AT88903297T patent/ATE70877T1/de not_active IP Right Cessation
  • 1988-12-08 KR KR1019880701625A patent/KR890700726A/ko not_active Application Discontinuation
  • 1988-12-09 NO NO88885476A patent/NO885476L/no unknown
• 1989
  • 1989-10-06 DK DK496589A patent/DK496589D0/da not_active Application Discontinuation
  • 1989-10-09 FI FI894791A patent/FI894791A0/fi not_active IP Right Cessation

Patent Citations (4)

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