AU616887B2 - A method of manufacturing a truss beam - Google Patents

A method of manufacturing a truss beam Download PDF

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Publication number
AU616887B2
AU616887B2 AU15779/88A AU1577988A AU616887B2 AU 616887 B2 AU616887 B2 AU 616887B2 AU 15779/88 A AU15779/88 A AU 15779/88A AU 1577988 A AU1577988 A AU 1577988A AU 616887 B2 AU616887 B2 AU 616887B2
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AU
Australia
Prior art keywords
carcase
members
flexible elements
spacer
elongate members
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.)
Ceased
Application number
AU15779/88A
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AU1577988A (en
Inventor
John Grandinetti
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INTEGRATED TECHNOLOGIES Ltd
Original Assignee
Integrated Technology Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Integrated Technology Ltd filed Critical Integrated Technology Ltd
Publication of AU1577988A publication Critical patent/AU1577988A/en
Application granted granted Critical
Publication of AU616887B2 publication Critical patent/AU616887B2/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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

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)

Abstract

A carcase (1) is firstly manufactured by arranging a plurality of elongate members (4) of a composite material around a plurality of spacer members (2). A plurality of taut wires (5, 5') is subsequently wound around the carcase (1) such that each elongate member (4) is contacted by one of the wires (5, 5') in the plane of each spacer member (2). The wires (5, 5') may be subsequently adhered to the carcase (1), preferably by means of melting a thermoplastics coating of the wires (5, 5') and allowing the coating to set. The beam produced by this method is lightweight and strong.

Description

61688 AU-AI-15779/88 W RLD INTELLECTUAL PROPERTY ORGANIZATION International Bureau 0) INTERNATIONAL APPLICATION PUBLISHED UNDER THE PATENT COOPERATION TREATY (PCT) (51) International Patent Classification 4 I (1 E04C 3/29, 3/08 Al (21) International Application Number: PCT/GB88/00279 (22) International Filing Date: 11 April 1988 (11.04.88) (31) Priority Application Number: (32) Priority Date: (33) Priority Country: 8708500 1) International Publication Number: WO 88/ 08064 3) International PubliC'tion Date: 20 October 1988 (20.10.88) (74) Common Representative: DEVONS, David, Jon; Marks Clerk, 57-60 Lincoln's Inn Fields, London WC2A 3LS (GB).
(81) Designated States: AT (European patent), AU, BE (European patent), BR, CH (European patent), DE (European patent), DK, Fl, FR (European patent), GB (European patent), IT (European patent), JP, KP, KR, LU (European patent), NL (European patent), NO, SE (European patent), US.
Published With international search report.
A.O.J.P. 8 DEC 1988 9 April 1987 (09.04.87)
GB
(71) Applicants (for all designated States except US): INTE- GRATED TECHNOLOGIES LIMITED Havelet House, South Esplanade, St. Peter Port, Guernsey DEVONS, David, Jon [GB/GB]; Marks Clerk, 57-60 Lincoln's Inn Fields, London WC2A 3LS (GB).
(72) Inventor; and Inventor/Applicant (for US only) GRANDINETTI, John [US/US]; P.O. Box 1208, Port Salerno, FL 34992
(US).
AUSTRALIAN
4 NOV 1988 PATEaNT QXFfCE (54) Title: A METHOD OF MANUFACTURING A TRUSS BEAM 2% 4 3, 1* I4 2 4 2 (57) Abstract A carcase is firstly manufactured by arranging a plurality of elongate members of a composite material around a plurality of spacer members A plurality of taut wires is subsequently wound around the carcase (1) such that each elongate member is contacted by one of the wires in the plane of each spacer member The wires may be subsequently adhered to the carcase preferably by means of melting a thermoplastics coating of the wires and allowing the coating to set. The beam produced by this method is lightweight and strong.
WO 88/08064 PCT/GB88/00279 A Method of Manufacturing a Truss Beam 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 invention provides a method of manufacturing a truss Sbeam characterised by the steps of: S(a) manufacturing a carcase comprising a plurality of elongate members spaced apart by a plurality of planar spacer members and subsequently winding a plurality of taut flexible elements around the carcase in a predetermined pattern such that each elongate .eo,' f member is contacted by one of
U
iW.
r PCT/GB 88/00279 SZ6 it Aprl 1989 2 Sel.ngat memher i:s ontacted by one of-the flexible elements in the plane of each spacer plate and is held in place thereby.
Preferably some of the flexible elements are wound around the carcase such that the edges of the spacer plates are contacted by the same some flexible elements between adjacent elongate members.
Preferably each flexible element is fixed to the carcase at each point of contact therebetween.
B Preferably the elongate members are tubular.
Preferably the elongate members are of a composite material comprising thermosetting or thermoplastics resin and fibres.
Preferably the materials used are selected such that their modulii of elasticity, Poisson's ratios and densities have values of the same order.
Preferably the materials used are selected such that they have modulii of elasticity, Poisson's ratios and densities of substantially the same values.
SUBSTITUTE SHEET United Kingdom Patent Office- PCT International Application GB 88/00279 26 April 1989 Preferably each flexible element is electrically conductive material and preferably has a coating of a thermoplastics material.
Preferably 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 plate in order to press the elongate members towards the spacer plates and retain a close fit therebetween. The beam thus produced then behaves as a single member for mechanical purposes: the flexible Selements carry the majority of any stresses which are applied to the beam. The beam is therefore strong aid lightweight. It may also be manufactured in substantial lengths, rather than in sections An embodiment of the invention is shown in the accompanying drawing, wherein; Fig. 1 is a perspective view of three spacer plates arranged along a tube or shaft: SUBSTITUTE SHEET United Kingdom Patent Office SSUBSTITUTE SPCT International Application I POT/ GB 88/00279 9 zs L 8 I 25 April 1989 4 Fig. 2 is a perspective view of a carcase comprising the spacer plates 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; and Fig. 4 is a perspective view of the carcase of Fig. 3 with a second wire wound around the tubes.
As can be seen from the drawings, the method according to the invention begins with the manufacture of the carcase 1. Spacer plates 2 of a composite material of 1. glassfibres and a thermoplastics resin are spaced at Sequal intervals along a shaft or tube 3. The shaft or K| 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 plates 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 plate 2. The edges of each spacer plate 2 are crossed by a wire 5 between adjacent V SUBSTITUTE SHEET I United Kingdom Patent Office PCT International Application PCT/GB 88/00279 26 April 1989 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 The further wires 5' also contact the tubes 4 in the plane of each spacer plate 2 and the edges of the spacer plates 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 plates 2 is also melted in the region lj adjacent each point of contact with the wires When the current is cut off and the wires 5.5' cool, the thermoplastics resin sets joining the wire 5,5' to the Stubes 4 and the spacer plates 2.
Although the 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 plates are possible: the arrangement shown in STITT H T United Kingdom Patent Office PA SUBSTITUTE SEETerationl Apliction PCT Intertionl Aplication i 7': WO 88/08064 PCT/GB88/00279 11
I
I
A
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. Alternatively, 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.
A suitable thermoplastics resin which may be used for the elongate members and the coating og the wires is that known in Sweden as "Aramid" which is a thermoplastic resin.
Nylon could also be used. This is by way of example only.
It should be understood that a single flexible element PCT/GB 88/00279 Ap April 1989 7 refers to a wire or 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.
i '311, 0 'OK N ly I United Kingdom Patent Office SUBSTITUTE SHEET PCT Internationral Aplicstion

Claims (13)

1. A method of manufacturing a truss beam characterised by the steps of: manufacturing a carcase comprising a plurality of elongate members spaced apart by a plurality of planar spacer members and subsequently winding a plurality of taut flexible elements around the carcase in a predetermined pattern such that each elongate member is contacted by one of the flexible elements in the plane of each spacer member and is held in place thereby.
2. A method as claimed in claim 1, wherein some of the flexible elements contact free edges of the :V spacer members between adjacent elongate members
3. A method as claimed in claim 1 or 2, wherein the flexible elements are fixed to the carcase at each point of contact therebetween.
4. A method as claimed in any one of the preceding y claims, wherein the elongate members are tubular. A method as claimed in any one of the preceding _L T SWO 88/08064 PCT/GB88/00279 9 claims, wherein the materials of the beam are selected such that they have modulii of elasticity Poisson's ratios (Vi and densities with values of the same order of magnitude.
6. A method as claimed in claim 5, wherein the materials of the beam are selected such that they have substantially the same modulus of elasticity (E i), Poisson's ratio and density
7. A method as claimed in claim 6, wherein the elongate members the spacer members and the flexible members all comprise the same material.
8. A method as claimed in any one of the preceding claims, wherein the elongate members are of composite material comprising thermosetting or thermoplastic resin and fibres.
9. A method as claimed in any one of the preceding claims, wherein the spacer members are arranged substantially equidistantly along the carcase A method as claimed in any one of the preceding claims, wherein each flexible element is electrically 'conductive. @Y. s r. I _i C I I M Or
11. A method as claimed in any one of the preceding claims, wherein the flexible elements and the carcase are locally heated at their mutual intersections in order to melt the thermoplastics coating and thus adhere the flexible elements to the carcase
12. A method as claimed in any one of claims 1 to wherein the flexible elements are made to adhere to the carcase by passing an electrical current therethrough.
13. A method as claimed in any one of the preceding claims, wherein each flexible element has a coating of thermoplasics material.
14. A method as claimed in any one of the preceeding .1 claims, wherein the beam is manufactured with the spacer members arranged on a rotatable shaft o A method of manufacturing a truss beam of composite material substantially as hereinbefore described with reference to the accompanying drawings.
16. A truss beam manufactured by a method according to any one of the preceding claims. Dated this 8th day of August 1991. INTEGRATED TECHNOLOGIES AND DAVID JON' DEVONS By their Patent Attorneys GRIFFITH HACK 4 CO.
AU15779/88A 1987-04-09 1988-04-11 A method of manufacturing a truss beam Ceased AU616887B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8708500 1987-04-09
GB08708500A GB2204614A (en) 1987-04-09 1987-04-09 Manufacture of a truss beam of composite materials

Publications (2)

Publication Number Publication Date
AU1577988A AU1577988A (en) 1988-11-04
AU616887B2 true AU616887B2 (en) 1991-11-14

Family

ID=10615530

Family Applications (1)

Application Number Title Priority Date Filing Date
AU15779/88A Ceased AU616887B2 (en) 1987-04-09 1988-04-11 A method of manufacturing a truss beam

Country Status (13)

Country Link
EP (1) EP0355103B1 (en)
JP (1) JPH03500068A (en)
KR (1) KR890700726A (en)
CN (1) CN88102214A (en)
AT (1) ATE70877T1 (en)
AU (1) AU616887B2 (en)
BR (1) BR8807454A (en)
DE (1) DE3867235D1 (en)
DK (1) DK496589D0 (en)
FI (1) FI894791A0 (en)
GB (1) GB2204614A (en)
NO (1) NO885476L (en)
WO (1) WO1988008064A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9312391U1 (en) * 1993-08-14 1993-10-21 Menzel, Hans-Claus, Dr., 70619 Stuttgart Bracing the center pillar of a composite pillar
DE29907874U1 (en) * 1999-05-04 2000-09-14 Hupperich, Werner, 53804 Much Assembly device for building purposes
AU782363B2 (en) * 1999-10-21 2005-07-21 Onesteel Reinforcing Pty Limited A rollable mesh apparatus
AUPQ356699A0 (en) * 1999-10-21 1999-11-11 Bhp Steel (Rp) Pty Ltd A rollable mesh apparatus
US8919071B2 (en) * 2012-12-19 2014-12-30 Patco, Llc Truss configuration

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3501880A (en) * 1967-11-08 1970-03-24 Lawrence R Bosch Captive column structure
GB2047783A (en) * 1979-04-18 1980-12-03 Pantex Stahl Ag Lattice support structure for a wall of an underground passage
US4566247A (en) * 1983-08-03 1986-01-28 Overbo Gordon I Captive column

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3436882A1 (en) * 1984-07-27 1986-01-30 Burger, Frank, 8000 München FRAME SYSTEM, ESPECIALLY FOR FRAMES AND INTERIORS

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3501880A (en) * 1967-11-08 1970-03-24 Lawrence R Bosch Captive column structure
GB2047783A (en) * 1979-04-18 1980-12-03 Pantex Stahl Ag Lattice support structure for a wall of an underground passage
US4566247A (en) * 1983-08-03 1986-01-28 Overbo Gordon I Captive column

Also Published As

Publication number Publication date
GB8708500D0 (en) 1987-05-13
NO885476L (en) 1989-02-01
DK496589A (en) 1989-10-06
JPH03500068A (en) 1991-01-10
BR8807454A (en) 1990-05-15
NO885476D0 (en) 1988-12-09
EP0355103B1 (en) 1991-12-27
DK496589D0 (en) 1989-10-06
WO1988008064A1 (en) 1988-10-20
DE3867235D1 (en) 1992-02-06
FI894791A0 (en) 1989-10-09
CN88102214A (en) 1988-10-26
GB2204614A (en) 1988-11-16
EP0355103A1 (en) 1990-02-28
ATE70877T1 (en) 1992-01-15
AU1577988A (en) 1988-11-04
KR890700726A (en) 1989-04-27

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