EP0177634B1 - Structural element particularly for obtaining electric line support girders - Google Patents
Structural element particularly for obtaining electric line support girders Download PDFInfo
- Publication number
- EP0177634B1 EP0177634B1 EP84112273A EP84112273A EP0177634B1 EP 0177634 B1 EP0177634 B1 EP 0177634B1 EP 84112273 A EP84112273 A EP 84112273A EP 84112273 A EP84112273 A EP 84112273A EP 0177634 B1 EP0177634 B1 EP 0177634B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- stringers
- sections
- flanges
- bidimensional
- structural element
- 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.)
- Expired - Lifetime
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H12/00—Towers; Masts or poles; Chimney stacks; Water-towers; Methods of erecting such structures
- E04H12/02—Structures made of specified materials
- E04H12/08—Structures made of specified materials of metal
-
- 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
- E04C3/06—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal with substantially solid, i.e. unapertured, 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
- E04C3/06—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal with substantially solid, i.e. unapertured, web
- E04C3/07—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal with substantially solid, i.e. unapertured, web at least partly of bent or otherwise deformed strip- or sheet-like material
-
- 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
- E04C2003/0408—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
- E04C2003/0417—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 demountable
-
- 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
- E04C2003/043—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 hollow cross-section comprising at least one enclosed cavity
-
- 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
- E04C2003/0447—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 circular- or oval-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
- E04C2003/0404—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
Definitions
- This invention relates to improved bidimensional truss structures to be used in particular as supports for overhead electric power transmission lines, the stringers of which are constructed in a particularly advantageous manner.
- the object of the present invention is to provide bidimensional truss structures comprising stringers formed with structural elements which combine the advantageous properties of the aforesaid known struc tural elements, without possessing their defects, thus allowing to plan and construct bidimensional supports for overhead electric power transmission lines, or any other type of bidimensional truss structure, with considerable advantages over the known art.
- the LU-A-60543 already discloses structural elements for metal structural work formed by a pair of half-shell sections, arranged with their concavities opposed and connected together in a discrete manner along their long sides, such as to guarantee a much higher torsional rigidity than that provided by corresponding open sections. Nevertheless, in these structural elements, the long sides of connection of the two half-shell sections forming them are in mutual contact.
- the invention now supplies a bidimensional truss structure comprising stringers constituted by structural elements formed as a tube by a pair of half-shell sections, arranged with their concavities opposed and connected together in a discrete manner, along flanges of their long sides, by means of bolts applied at spaced locations along said flanges, characterized in that, the section flanges are kept spaced apart and parallel by inserting cross stiffening brackets in correspondence with the connection bolts, such that slots are provided between the flanges.
- the invention especially concerns a particularly slender bidimensional truss structure, in the form of a self-braced trestle support for overhead electric power transmission lines, wherein said structural elements forming the stringers are connected together in such a manner as to prevent any relative rotation of the sections of the two stringers, so that the torsional rigidity of said stringers opposes any lateral deflections thereof.
- Fig. 1 is an interrupted perspective view of a first embodiment of the structural element used to form the stringers of bidimensional truss structures according to the invention
- Fig. 1bis shows, on an enlarged scale, a construction detail of said structural element
- Figs. 2 and 3 are interrupted perspective views of two other embodiments of said structural element
- Fig. 4 shows the transport packaging system for the half-shell sections used to form the structural elements of figs. 1 to 3;
- Fig. 5 is a diagrammatic illustration of a particularly slender bidimensional self-braced trestle support for overhead electric power transmission lines, constructed using structural elements of the type shown in figs. 1 to 3 to form its stringers;
- Figs. 6 and 7 are detailed views of some construction details of the support of fig. 5;
- Fig. 8 shows a lattice support or anchor tower for overhead electric power transmission lines, constructed in the form of a three-dimensional girder, using structural elements of the type shown in fig. 3 to form its stringers;
- Figs. 9 and 10 are detailed views of some construction details of the support of fig. 8.
- the structural element used to form the stringers of the bidimensional truss structure consists of a pair of open half-shell fellow sections 1, arranged with their concavities opposed and connected together in a discrete manner along their long sides.
- the sections 1 are channel sections with a very wide base 1A and with outwardly inclined sides 1B, terminating with flanges 2 parallel to the base 1A.
- the discrete or discontinuous connection of the two sections 1 is obtained, in the illustrated embodiments, by means of bolts 3 applied at spaced locations, either singly or in pairs, along the flanges 2 of said sections 1.
- the sections 1 and their flanges 2 are kept spaced apart in order to form slots 4 in the above structural element, apt to prevent extended contact between the flanges which could give rise to corrosion phenomena.
- These slots are also useful for inserting hooking members to facilitate climbing the structures formed therewith, and for introducing means to spray-paint the interior of said structural elements.
- cross stiffening brackets 5 disposed at a certain distance apart, are inserted between the flanges 2 in the zones of application of the bolts 3.
- FIG. 1bis One method for connecting together the flanges 2 of the two half-shell sections 1 of said structural element, which is particularly advantageous for attaining the proposed objects, is shown in figure 1bis.
- the bores 2A for the bolts 3, made into the section flanges 2 are deep-drawn in order to cooperate with corresponding cavities 5A provided in the surfaces of the cross stiffening brackets 5.
- This arrangement prevents any possible relative sliding between the thus connected flanges 2 of the two sections forming the structural element, thereby also increasing the torsional rigidity of the structural element itself.
- figure 2 wherein a zig-zag bent plate 6 is interposed between the flanges 2 of the half-shell sections 1, and in figure 3, which illustrates a structural element particularly suited to form the stringers of three-dimensional girders, for example for lattice supports of overhead electric power transmission lines.
- This element is formed by associating a half-shell section 1, of the type used for the structural elements of figures 1 and 2, to a simple angle iron 1C.
- the connection is again obtained using cross stiffening brackets 5 and bolts 3, applied between the flanges 2 of the section 1 and the edges of the long sides of the section 1C acting as flanges.
- slots 4 are formed between the two sections of the structural element, for the assembly of which the construction method of figure 1bis can be applied, with all the advantages deriving therefrom.
- This element has all the advantages of open sections, with regard to production costs, easiness of connection (as illustrated hereinafter), easy galvanising, and reduced transportation bulk (as can easily be seen from figure 4 which shows the system for packaging the component half-shell sections). It also has the essential advantage of structural tube elements, namely to guarantee a much higher torsional rigidity than the corresponding open sections. However, this structural element has none of the basic drawbacks of tubes. By varying therein the assembly method of the component half-shell sections, it is also possible to vary the strength and flexural rigidity according to one axis. Thus, with the element of figure 2, in which a bent plate 6 is inserted between the flanges 2 of the sections 1, a greater spacing is obtained between the component half-shell sections, and thus increased strength and flexural rigidity than in the element of figure 1.
- the assembly can also be carried out in such a manner as to continuously vary the strength along the length of the structural element, by using cross stiffening brackets of different thickness, or plates of variable thickness, for spacing with slots of variable thickness the flanges of the opposed half-shell sections.
- a tapered structural element can thus be formed.
- component sections of the aforedescribed element can be manufactured using the same rolls for different sizes of their base 1A, leading to a further advantage in production costs.
- the invention proposes to construct the stringers of a bidimensional truss structure which allows, very advantageously, to form a particularly slender support for overhead electric power transmission lines wherein said stringers have such a high torsional rigidity as to prevent any lateral deviations - outside the support plane - of the compressed stringer.
- FIG. 5 An example of a bidimensional self-braced trestle support for overhead electric power transmission lines of this type is shown in figure 5.
- this support use is made of two sets of structural elements 11 and 12 - for example of the type shown in figure 1 - arranged to form two stringers which are mutually inclined over the major length A of the height of the bidimensional truss structure forming the support, but which run parallel and close at the top B of said support.
- the stringers formed by the elements 11 and 12 are connected together in two zones C and D by similar transversal elements 13 and 14.
- Figures 6 and 7 show respectively a possible scheme for connecting together the elements 11 and 13 in zone C of the support, and for connecting together the elements 11 and 12 in the top part B of said support (this latter connection being obtained by applying simple channel sections 15).
- This latter connection being obtained by applying simple channel sections 15.
- the simplicity, easiness and efficiency of the connections between the support components can be easily deduced from these figures.
- Figure 9 is a diagrammatic view of one of these supports, in the form of a girder comprising four stringers 16, each constituted by structural elements of the type shown in figure 3.
- Figures 10 and 11 are a side view and, respectively, a horizontal section view of one of the stringers 16, at the connection point with the lattice members 17.
Abstract
Description
- This invention relates to improved bidimensional truss structures to be used in particular as supports for overhead electric power transmission lines, the stringers of which are constructed in a particularly advantageous manner.
- For the construction of supports for overhead electric power transmission lines, structural elements are currently used consisting essentially of open sections (usually angle irons), which are favoured for their low production costs, easiness of connection, easy protection treatments (galvanising) and reduced transportation bulk.
- However these elements, which are well known and widely spread, give rise to local or torsional instability problems when used as bars subjected to combined compressive and bending stresses, such problems being solved by using sections which are thicker and heavier than desirable.
- Moreover, flat or slender structures constructed with these conventional elements have very low critical out-of-plane twisting loads, a consequence of the torsional instability of the component parts, and this can be a serious limitation in planning certain advanced types of supports for electric lines.
- All these drawbacks could easily be eliminated by replacing the structural elements in the form of open sections by tubular metal elements. However these latter, though having properties which have long been known and appreciated, have had little application in practise because of the high production costs of the tubes, the difficulty of making the connections and the consequent high costs of these latter, and the considerable transportation bulk thereof.
- The object of the present invention is to provide bidimensional truss structures comprising stringers formed with structural elements which combine the advantageous properties of the aforesaid known struc tural elements, without possessing their defects, thus allowing to plan and construct bidimensional supports for overhead electric power transmission lines, or any other type of bidimensional truss structure, with considerable advantages over the known art.
- The LU-A-60543 already discloses structural elements for metal structural work formed by a pair of half-shell sections, arranged with their concavities opposed and connected together in a discrete manner along their long sides, such as to guarantee a much higher torsional rigidity than that provided by corresponding open sections. Nevertheless, in these structural elements, the long sides of connection of the two half-shell sections forming them are in mutual contact.
- The invention now supplies a bidimensional truss structure comprising stringers constituted by structural elements formed as a tube by a pair of half-shell sections, arranged with their concavities opposed and connected together in a discrete manner, along flanges of their long sides, by means of bolts applied at spaced locations along said flanges, characterized in that, the section flanges are kept spaced apart and parallel by inserting cross stiffening brackets in correspondence with the connection bolts, such that slots are provided between the flanges.
- The invention especially concerns a particularly slender bidimensional truss structure, in the form of a self-braced trestle support for overhead electric power transmission lines, wherein said structural elements forming the stringers are connected together in such a manner as to prevent any relative rotation of the sections of the two stringers, so that the torsional rigidity of said stringers opposes any lateral deflections thereof.
- Some embodiments of the invention are described hereinafter in greater detail with reference to the accompanying drawings, in which:
- Fig. 1 is an interrupted perspective view of a first embodiment of the structural element used to form the stringers of bidimensional truss structures according to the invention;
- Fig. 1bis shows, on an enlarged scale, a construction detail of said structural element;
- Figs. 2 and 3 are interrupted perspective views of two other embodiments of said structural element;
- Fig. 4 shows the transport packaging system for the half-shell sections used to form the structural elements of figs. 1 to 3;
- Fig. 5 is a diagrammatic illustration of a particularly slender bidimensional self-braced trestle support for overhead electric power transmission lines, constructed using structural elements of the type shown in figs. 1 to 3 to form its stringers;
- Figs. 6 and 7 are detailed views of some construction details of the support of fig. 5;
- Fig. 8 shows a lattice support or anchor tower for overhead electric power transmission lines, constructed in the form of a three-dimensional girder, using structural elements of the type shown in fig. 3 to form its stringers; and
- Figs. 9 and 10 are detailed views of some construction details of the support of fig. 8.
- With reference to the drawings, it can be seen from figures 1 to 3 that the structural element used to form the stringers of the bidimensional truss structure according to the invention consists of a pair of open half-shell fellow sections 1, arranged with their concavities opposed and connected together in a discrete manner along their long sides.
- In the embodiments shown, the sections 1 are channel sections with a very
wide base 1A and with outwardlyinclined sides 1B, terminating withflanges 2 parallel to thebase 1A. - The discrete or discontinuous connection of the two sections 1 is obtained, in the illustrated embodiments, by means of
bolts 3 applied at spaced locations, either singly or in pairs, along theflanges 2 of said sections 1. - According to the invention, the sections 1 and their
flanges 2 are kept spaced apart in order to formslots 4 in the above structural element, apt to prevent extended contact between the flanges which could give rise to corrosion phenomena. These slots are also useful for inserting hooking members to facilitate climbing the structures formed therewith, and for introducing means to spray-paint the interior of said structural elements. - For this purpose,
cross stiffening brackets 5, disposed at a certain distance apart, are inserted between theflanges 2 in the zones of application of thebolts 3. - One method for connecting together the
flanges 2 of the two half-shell sections 1 of said structural element, which is particularly advantageous for attaining the proposed objects, is shown in figure 1bis. As can be seen, the bores 2A for thebolts 3, made into thesection flanges 2, are deep-drawn in order to cooperate withcorresponding cavities 5A provided in the surfaces of the cross stiffeningbrackets 5. - This arrangement prevents any possible relative sliding between the thus connected
flanges 2 of the two sections forming the structural element, thereby also increasing the torsional rigidity of the structural element itself. - Further solutions are shown in figure 2, wherein a zig-
zag bent plate 6 is interposed between theflanges 2 of the half-shell sections 1, and in figure 3, which illustrates a structural element particularly suited to form the stringers of three-dimensional girders, for example for lattice supports of overhead electric power transmission lines. This element is formed by associating a half-shell section 1, of the type used for the structural elements of figures 1 and 2, to a simple angle iron 1C. The connection is again obtained using cross stiffeningbrackets 5 andbolts 3, applied between theflanges 2 of the section 1 and the edges of the long sides of the section 1C acting as flanges. Also in this case,slots 4 are formed between the two sections of the structural element, for the assembly of which the construction method of figure 1bis can be applied, with all the advantages deriving therefrom. - In each case - as can be seen - a structural element is obtained, formed as a tube but the component parts of which are open sections.
- This element has all the advantages of open sections, with regard to production costs, easiness of connection (as illustrated hereinafter), easy galvanising, and reduced transportation bulk (as can easily be seen from figure 4 which shows the system for packaging the component half-shell sections). It also has the essential advantage of structural tube elements, namely to guarantee a much higher torsional rigidity than the corresponding open sections. However, this structural element has none of the basic drawbacks of tubes. By varying therein the assembly method of the component half-shell sections, it is also possible to vary the strength and flexural rigidity according to one axis. Thus, with the element of figure 2, in which a
bent plate 6 is inserted between theflanges 2 of the sections 1, a greater spacing is obtained between the component half-shell sections, and thus increased strength and flexural rigidity than in the element of figure 1. - The assembly can also be carried out in such a manner as to continuously vary the strength along the length of the structural element, by using cross stiffening brackets of different thickness, or plates of variable thickness, for spacing with slots of variable thickness the flanges of the opposed half-shell sections. A tapered structural element can thus be formed.
- It should also be noted that the component sections of the aforedescribed element can be manufactured using the same rolls for different sizes of their
base 1A, leading to a further advantage in production costs. - With this structural element, the invention proposes to construct the stringers of a bidimensional truss structure which allows, very advantageously, to form a particularly slender support for overhead electric power transmission lines wherein said stringers have such a high torsional rigidity as to prevent any lateral deviations - outside the support plane - of the compressed stringer.
- An example of a bidimensional self-braced trestle support for overhead electric power transmission lines of this type is shown in figure 5. To construct this support, use is made of two sets of
structural elements 11 and 12 - for example of the type shown in figure 1 - arranged to form two stringers which are mutually inclined over the major length A of the height of the bidimensional truss structure forming the support, but which run parallel and close at the top B of said support. The stringers formed by theelements transversal elements elements elements - The advantages deriving from combining, in the stringers of the truss structures according to the invention, the merits of open sections and of tubes, but without their defects, also extend to the conventional three-dimensional girders, in particular three-dimensional lattice supports for overhead electric power transmission lines realized with similar stringers.
- Figure 9 is a diagrammatic view of one of these supports, in the form of a girder comprising four
stringers 16, each constituted by structural elements of the type shown in figure 3. Figures 10 and 11 are a side view and, respectively, a horizontal section view of one of thestringers 16, at the connection point with thelattice members 17. - It is apparant that, using the structural elements of figure 3, in a support of the type shown in figure 8, drastically reduces problems deriving from torsional and local instability, which are always present in these structures, whereby sections of very reduced thickness, and thus much lighter, can be used in said structures, with obvious considerable advantages.
Claims (3)
- Bidimensional truss structure comprising stringers constituted by structural elements formed as a tube by a pair of half-shell sections (1), arranged with their concavities opposed and connected together in a discrete manner, along flanges (2) of their long sides, by means of bolts (3) applied at spaced locations along said flanges (2), characterized in that, the section flanges are kept spaced apart and parallel by inserting cross stiffening brackets (5) in correspondence with the connection bolts (3), such that slots (4) are provided between the flanges.
- Bidimensional truss structure as in claim 1), being particularly slender and characterized in that said structural elements forming the stringers are connected together in such a manner as to prevent any relative rotation of the sections of the two stringers, so that the torsional rigidity of said stringers opposes any lateral deflections thereof.
- Bidimensional truss structure as in claim 1), in the form of a self-braced trestle support for overhead electric power transmission lines.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE8484112273T DE3484441D1 (en) | 1984-10-12 | 1984-10-12 | STRUCTURAL ELEMENT, ESPECIALLY FOR MAKING GRILTS FOR ELECTRICAL CABLES. |
EP84112273A EP0177634B1 (en) | 1984-10-12 | 1984-10-12 | Structural element particularly for obtaining electric line support girders |
AT84112273T ATE62519T1 (en) | 1984-10-12 | 1984-10-12 | STRUCTURAL ELEMENT, IN PARTICULAR FOR FORMING LATERAL POLE FOR ELECTRICAL CABLES. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP84112273A EP0177634B1 (en) | 1984-10-12 | 1984-10-12 | Structural element particularly for obtaining electric line support girders |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0177634A1 EP0177634A1 (en) | 1986-04-16 |
EP0177634B1 true EP0177634B1 (en) | 1991-04-10 |
Family
ID=8192216
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP84112273A Expired - Lifetime EP0177634B1 (en) | 1984-10-12 | 1984-10-12 | Structural element particularly for obtaining electric line support girders |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0177634B1 (en) |
AT (1) | ATE62519T1 (en) |
DE (1) | DE3484441D1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE8713079U1 (en) * | 1987-09-29 | 1987-11-12 | Durlum-Leuchten Gmbh Lichttechnische Spezialfabrik, 7860 Schopfheim, De | |
IT1230354B (en) * | 1989-07-14 | 1991-10-18 | Sae Sadelmi S P A | FLAT SUPPORT FOR AIR LINES FOR ELECTRICITY TRANSPORT. |
FR2657909B1 (en) * | 1990-02-02 | 1993-10-15 | Profilcometube | BEAMS AND POSTS, SINGLE AND DOUBLE, CONSTITUTED BY THE JOINING OF PROFILES WITH STRAIGHT Z-SECTION, AND PARTICULARLY ALLOWING THE REALIZATION OF A GANTRY OR A JIB FOR A BUILDING CONSTRUCTION. |
GB9317282D0 (en) * | 1993-08-19 | 1993-10-06 | Ward Building Systems Ltd | Structural members |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR47832E (en) * | 1936-11-19 | 1937-07-31 | Mortsel Et Etablissements Geer | Pole used to suspend power lines and others |
FR951882A (en) * | 1947-07-07 | 1949-11-04 | Method of manufacturing a tube for metal construction by fitting elements | |
DE1759568A1 (en) * | 1968-05-15 | 1971-06-16 | Transnorm Foerderanlagen Und S | Beam-like component with a box-shaped hollow profile |
LU60543A1 (en) * | 1970-03-17 | 1970-05-21 | ||
GB2081792B (en) * | 1980-08-13 | 1984-02-22 | Acrow Eng Ltd | Formwork soldier |
AU536400B3 (en) * | 1983-12-07 | 1984-05-03 | Clara Investments Pty. Limited | Metal post |
-
1984
- 1984-10-12 EP EP84112273A patent/EP0177634B1/en not_active Expired - Lifetime
- 1984-10-12 DE DE8484112273T patent/DE3484441D1/en not_active Expired - Fee Related
- 1984-10-12 AT AT84112273T patent/ATE62519T1/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
ATE62519T1 (en) | 1991-04-15 |
EP0177634A1 (en) | 1986-04-16 |
DE3484441D1 (en) | 1991-05-16 |
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