Triangulation of a lattice girder, in particular of a jib element for a tower crane
AssigneePotain
InventorsMichel Lissandre, Jean-Pierre Gautier
Life of this patent
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Abstract
For a lateral face of the lattice girder, defined by an upper chord and a lower chord, the triangulation comprises compression bars substantially perpendicular to the chords, oblique tension bars of smaller length connecting the top of a compression bar to the lower chord, and other oblique tension bars of greater length, also connecting the top of a compression bar to the lower chord, at a point located further ahead toward the base of the next compression bar. This triangulation is used, in particular, for the jib and counterjib elements of tower cranes.
Claims6
A triangulation of a lattice girder, in particular of a lattice jib element, or of a lattice counterjib element, of a tower crane, characterized in that it comprises, for a lateral face of said girder or of said lattice element defined by an upper chord and a lower chord and divided longitudinally according to a predefined interval:
- compression bars substantially perpendicular to the chords and each connecting the upper chord to the lower chord, these compression bars succeeding one another according to a spacing equal to double the interval;
- oblique tension bars of smaller length, each connecting the top of a compression bar to the lower chord at a point located at an interval ahead of the base of this compression bar;
- other oblique tension bars of greater length, each connecting the top of a compression bar to the lower chord at a point located at two intervals ahead of the base of this compression bar, hence toward the base of the next compression bar.
Dependencies are inferred from the claim text.