TRIANGULAR CONNECTION PART OF LATTICE GIRDER OF JIB ELEMENT, ESPECIALLY FOR TOWER CRANE

摘要

PROBLEM TO BE SOLVED: To adequately reduce the cost for manufacturing, and cost for crane operation by reducing the number of components of the element, the weight of the element, and a windbreak lateral side regarding the constitution of a lattice girder element and a counter jib or a jib element, especially for a tower crane.;SOLUTION: On a lateral side of the lattice girder defined by an upper chord and a bottom chord, a triangular connection part consists of a plurality of compression bars which are substantially right angle to a plurality of chords, and a plurality of short inclining tension bars which connect the tops of the compression bars to the bottom chord, and a plurality of other long inclining tension bars which connect the tops of the compression bars to the bottom chord at a point located further ahead of a base of the next compression bars. The triangular connection part is utilized for a counter jib element or a jib, especially for the tower crane.;COPYRIGHT: (C)2004,JPO