Lattice mast having an open framework structure in particular an electricity pylon or telecommunication mast, and method for increasing the stability of lattice masts having an open framework structure

Abstract

The invention relates to a lattice mast ( 1 ) with an open framework structure of angled profiles ( 3 ), in particular an electricity pylon or telecommunications mast, comprising at least one or more cladding profiles (9 a, 9 b ) which extend over at least part of the length of at least one angled profile ( 3 ), wherein at least one cladding profile has a curved incident-flow surface and forms a flow shielding of a wind-exposed edge of the angled profile ( 3 ), wherein the incident-flow surface is at least approximately spherically curved and has a flow resistance coefficient which is less than that of the unshielded angled profile ( 3 ).

1 . A lattice mast with an open framework structure of angled profiles, comprising at least one cladding profile that extends over at least part of the length of at least one angled profile, wherein said at least one cladding profile has an incident-flow surface that forms a flow shielding of a wind-exposed edge of the angled profile, wherein the incident-flow surface has a flow resistance coefficient that is less than that of an unshielded angled profile, and wherein said at least one cladding profile comprises a back-foamed shell-like profile segment. 
     
     
         2 . The lattice mast of  claim 1 , wherein the incident-flow surface is at least approximately spherically curved or has a polygonal contour which is at least similar to a spherical or elliptical arc contour. 
     
     
         3 . The lattice mast of  claim 1 , wherein the curved incident-flow surface of the at least one cladding profile is expediently symmetrically with respect to said exposed edge. 
     
     
         4 . The lattice mast of  claim 1 , wherein said at least one cladding profile has a maximum projection area selected from the group consisting of no more than 60% greater, no more than 40% greater, and no more than 20% greater, than the maximum projection area of the unclad angled profile. 
     
     
         5 . The lattice mast of  claim 1 , wherein said at least one cladding profile forms a structural unit with at least one angled profile. 
     
     
         6 . The lattice mast of  claim 1 , wherein said at least one cladding profile is connected to at least one angled profile by at least one fastening selected from a group consisting of adhesive bonding, riveting, clamping, fastening with Velcro, binding, screwing, stapling, and foaming. 
     
     
         7 . The lattice mast  claim 1 , wherein multiple cladding profiles are connected to one another and/or to at least one angled profile of the framework via nodes of a framework structure, forming a structural unit. 
     
     
         8 . The lattice mast  claim 1 , wherein at least one cladding profile complements the angled profile to form a closed profile cross-section. 
     
     
         9 . The lattice mast of  claim 1 , wherein multiple cladding profiles form a closed or approximately closed profile cross-section at least partially enclosing the angled profile. 
     
     
         10 . The lattice mast of  claim 1 , wherein multiple cladding profiles are complemented to form a closed or approximately closed spherical or elliptical cross-section. 
     
     
         11 . The lattice mast of  claim 1 , wherein at least one shell-like profile segment comprises profile legs, wherein at least one free end of at least one profile leg is frayed or has strips or holes or at least one additional perforated profile that reduces flow resistance and/or increases aerodynamic damping. 
     
     
         12 . A method for increasing the stability of lattice masts comprising an open framework structure comprising angled profiles, using at least one cladding profile, comprising cladding at least one angled profile with a cladding profile that has at least one at least approximately spherically curved incident-flow surface wherein at least one wind-exposed edge of said angled profiles is thereby shielded by the cladding profile, and wherein the angled profile is complemented or clad at least partially to form an essentially closed or approximately closed, at least partially round or facetted profile cross-section, and further comprising upgrading said lattice mast to form a lattice mast in which the at least one cladding profile is configured as a shell-like profile segment that is back-foamed. 
     
     
         13 . The method of  claim 12 , further comprising the step of a subsequent upgrading of a lattice mast to form an aerodynamically clad lattice mast as claimed in  claim 1 . 
     
     
         14 . The method of  claim 12 , wherein said lattice mast is an electricity pylon or telecommunications mast. 
     
     
         15 . The lattice mast of  claim 1 , wherein said lattice mast is an electricity pylon or telecommunications mast.