TOWER CRANE AND METHOD FOR ITS ASSEMBLY Russian patent published in 2009 - IPC B66C23/26 

FIELD: construction.

SUBSTANCE: invention is related to construction tower cranes. Tower crane includes frame with a rotary platform installed in it, counterbalance and crane tower, with which crane head and spreader bar are joined, where cargo winch of crane is located, crane boom brace, tower brace, and spreader brace, besides mentioned braces are made of hingedly joined rigid links. At top of head on axis a rocker beam that rotates in vertical plane is installed, one end of which is hingedly joined to crane boom brace, and its other end is hingedly joined to spreader brace, at that at least one assembly unit is installed on spreader axis. In process of tower crane assembly, it is installed in vertical position, boom and spreaders are hingedly joined to tower, and fixed in pre-assembly positions inclined to tower. Boom and spreaders are rotated into horizontal working positions around their hinged joints of connection to tower. End of spreader is connected to top of head with brace, afterwards spreader is lowered into horizontal position, then spreader and platform are connected with tower brace. Boom is rotated into working horizontal position with application of polyspast, joined with cargo winch and with the help of mounting traction rod connected to polyspast, one its end is installed between head and spreader, and the other end is installed between boom and head. Boom brace is connected to end of mounting traction rod, length of boom-raising polyspast is reduced, mounting traction rod is displaced to the side of crane spreader to horizontal position of boom, which is then connected by boom brace with head top.

EFFECT: improved reliability of crane and reduced labour intensity of assembly and disassembly works.

2 cl, 13 dwg