Construction of bridge decking and like structures
AssigneeCampenon Bernard Europe
InventorPierre Armand Maurice Thivans
Life of this patent
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Abstract
The invention refers to an improvement in the construction of segmental spans such as bridges and similar structures by the method known as "step-by-step" consisting in mounting segments or modules in succession at the end of a cantilever span section already erected. In accordance with this improvement, each module is moved in the decking parallel with its width as far as a stand-by position, then lifted by an arm which is pivoted a quarter of a turn about a vertical post located beside the module and inboard of the span section and resting on it by two beams. The module is next lowered and is in the erection position.
Claims8
In a "step-by-step" method for the construction of a segmental span structure, in which a plurality of modules having a transverse dimension equal to the width of the span structure and a length substantially less than said transverse dimension, are mounted in succession at the end of a cantilever span section disposed between successive supporting pillars, the improvement comprising the steps of (a) displacing a module along the cantilever span section with said transverse dimension of the module parallel to said span section, up to a stand-by position adjacent an end edge of the cantilever span section;
- (b) lifting the module;
- (c) pivoting the module by a quarter of a turn over said end edge about a substantially vertical axis located between a side edge of the cantilever span section and the module in said stand-by position, to bring the module in outboard position with the transverse dimension of the module parallel to said end edge;
- and (d) lowering the module from said outboard position to an erection position engaging said end edge.
In a system for erecting a segmental span structure, in which a plurality of modules having a transverse dimension equal to the width of the span structure and a length substantially less than said transverse dimension, are mounted in succession at the end of a cantilever span section disposed between successive supporting pillars, the improvement comprising (a) means for displacing a module along the cantilever span section with said transverse dimension substantially parallel to said span section, up to a stand-by position adjacent an end edge of the cantilever span section;
- and (b) crane means for bringing the module to an erection position in which the module engages said end edge with said transverse dimension parallel thereto, the crane means comprising (1) a crane post having a substantially vertical axis, (2) an arm mounted on said post for pivoting movement about said axis, (3) means for supporting the crane post on the cantilever span section beside the module in said stand-by position with said axis spaced equally from the centers of gravity of the module in the stand-by and erection positions and viewing the said centers of gravity at right angle, (4) means in said arm from lifting the module from said stand-by position, (5) means for pivoting the arm by a right angle over said end edge to bring the module to an outboard position above said erection position, and (6) means for lowering the module from said outboard position to said erection position.
Dependencies are inferred from the claim text.