Bridge comprising a bridge floor and elements supporting said floor, particularly a long span cable-stayed bridge, and process of construction
AssigneeScetauroute
InventorJean Muller
Life of this patent
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Abstract
Bridge comprising a bridge floor, said floor consisting of an upper boom (4) which may form a road section, a lower boom (5) which may be formed by a tubular succession of sections, and diagonal linking girders (6), joining the booms, their axes converging on that of the lower boom. Those elements subjected to high stress are preferably to be provided with individual pretensioning elements. The gussets (15) linking the diagonals with the upper boom carry advantageously the attachment elements of the supporting stay cables (2).
Claims21
A bridge composed of a deck and of means for supporting the deck, the deck comprising:
- an upper chord forming a roadway slab having a horizontal mid-plane,
- a lower chord forming a continuous longitudinal element having a vertical longitudinal plane of symmetry in relation to said upper chord and a longitudinal axis of symmetry in said longitudinal plane,
- connecting girders, called "diagonals", connecting the upper and lower chords, having an axis, and directed obliquely both relative to the vertical and relative to the length of the bridge, and forming, with the chords, a three-dimensional lattice, wherein the axis at a first end of each of two adjacent diagonals converges on the longitudinal axis of symmetry of the lower chord, and the axis at a second end of each of two adjacent diagonals converges with the mid-plane of the upper chord, with the diagonals which are subjected to high tensile forces being prestressed by at least one continuous prestressing means which is connected to a first edge of the upper chord, bisects the longitudinal plane of symmetry of the lower chord and is connected to a second edge of the upper chord which is in the same plane as said first edge of the upper chord.
A process for constructing a bridge composed of a deck and of means for supporting this deck, the deck comprising:
- an upper chord forming a roadway slab,
- a lower chord forming a continuous longitudinal element,
- connecting girders, called "diagonals", connecting the upper and lower chords and directed obliquely both relative to the vertical and relative to the length of the bridge, and forming, with the chords, a three-dimensional lattice, the axes of the diagonals converging on the longitudinal axis of the lower chord or the mid-plane of the upper chord, the diagonals which are subjected to high tensile forces being prestressed by means which are common to two concurrent diagonals,
- comprising the following steps:
- placing, on a deck part already mounted, two longitudinal temporary edging girders on either side of the upper chord, so as to be overhung by a length at least equal to the longitudinal dimension of one mesh of the three-dimensional lattice, each girder being retained by means of two successive nodes of the three-dimensional lattice already mounted,
- bringing up a new mesh of the three-dimensional lattice, this mesh comprising at least one node located on the lower chord, two nodes located on the upper chord and the diagonals corresponding to these nodes,
- fixing together this new mesh and the deck part already mounted, the new mesh being supported by means of the temporary edging girders,
- starting the operations again by advancing the temporary edging girders along the mesh which has just been fixed.
Dependencies are inferred from the claim text.