Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
187 words
A method of producing a prestressed beam of steel having a flange, which comprises the steps of: securing to the flange a plurality of spaced apart transmission elements; attaching at least one tensioning wire to the transmission elements, each wire being attached to two of the transmission elements so that the respective wires extend at predetermined distances from the flange; tensioning the at least one wire so as to apply to the beam via the transmission elements in positions corresponding to each transmission element, a bending moment which is oppositely directed to that of the operating loads to be applied to the beam, and applying a stress to the beam during the tensioning of the at least one wire which substantially counteracts the bending moments, in order to create solely compressive forces in the beam; encasing the at least one wire, the transmission elements and the flange in concrete while maintaining the tensioning; and after the concrete has set, freeing the beam of the stresses counteracting the bending moments due to the tensioning of the at least one wire to allow the beam of steel to bend.
Claim 2
Independent Claim
187 words
A method of producing a prestressed beam of steel having a flange, which comprises the steps of: securing to the flange a plurality of spaced apart transmission elements; attaching at least one tensioning wire to the transmission elements, each wire being attached to two of the transmission elements so that the respective wires extend at predetermined distances from the flange; tensioning the at least one wire so as to apply to the beam via the transmission elements in positions corresponding to each transmission element, a bending moment which is oppositely directed to that of the operating loads to be applied to the beam, and applying a stress to the beam during the tensioning of the at least one wire which substantially counteracts the bending moments, in order to create solely compressive forces in the beam; encasing the at least one wire, the transmission elements and the flange in concrete while maintaining the tensioning; and after the concrete has set, freeing the beam of the stresses counteracting the bending moments due to the tensioning of the at least one wire to allow the beam of steel to bend.
Claim 3
Dependent Claim
85 words
The method as claimed in claim 1, further comprising the step of: before tensioning the at least one wire, securing to the flange, between at least two symmetrically disposed transmission elements, at least one guide element which transversely and symmetrically to the bending plane of the beam spaces apart the tensioning wires which, by virtue of the tensioning, hold the guide element in this bending plane so that the guide element, by virtue of its fastening to the beam, prevents lateral buckling of the beam.
Claim 4
Dependent Claim
28 words
The method as claimed in claim 1, further comprising the step of: encasing the beam except for the flange in non-reinforced concrete prior to securing the transmission elements.
Claim 5
Dependent Claim
28 words
The method as claimed in claim 1, further comprising the step of: encasing the beam except for the flange in reinforced concrete prior to securing the transmission elements.
Claim 6
Dependent Claim
27 words
The method as claimed in claim 1, wherein the spaced apart transmission elements are arranged symmetrically in relation to the center of the span of the beam.