Patent ID: 6422408
Filing Date: 2002-07-23
Classification: B66C

Abstract:
A method for mounting a revolving part, the revolving part comprising a jib bearer, a delivery jib which is articulated by its posterior end to a front face of the jib bearer and connected to a top of the jib bearer by one or more anterior tie rods, and a counterjib which is articulated by its anterior end to a rear face of the jib bearer and connected to the top of the jib bearer by one or more posterior tie rods, the method comprising the steps of:assembling a first assembly formed by the counterjib, the posterior tie rod or rods and a rear part of the jib bearer, the first assembly connected along a horizontal axis on a revolving pivot or a mast-cab element connected to the revolving pivot; assembling a second assembly formed by the delivery jib, the anterior tie rod or rods and a front part of the jib bearer, the second assembly connected along a horizontal axis on a revolving pivot or a mast-cab; lifting the first assembly; lifting the second assembly; and connecting respective tops of the front part and the rear part of the jib bearer together, wherein the lifting of the first assembly is performed using slings comprising front slings secured to a base of the rear part of the jib bearer and passing over a deflecting member borne by the rear part, and rear slings secured to the structure of the counterjib to keep the structure of the counterjib approximately horizontal while the first assembly is being lifted and pinned to the revolving pivot or the mast-cab, the posterior tie rod or rods of the counterjib being aligned and taut.