DEVICE TO LIFT AND INSTALL SPAN BLOCKS Russian patent published in 2013 - IPC E01D21/00 

FIELD: construction.

SUBSTANCE: device comprises a spatial bearing structure with an anchor, front and rear cross beams resting by means of carriages against a rail track, a mechanism to lift span blocks, a mechanism of longitudinal displacement of the device and the rail track, a mechanism of transverse and longitudinal displacement of an installed span block, comprising a lower frame movably resting against the spatial bearing structure, and an upper frame movably resting against the lower frame, and having a mechanism to lift span blocks built into it, and a power drive of these mechanisms. The spatial bearing structure is made in the form of a frame of trapezoidal shape, comprising two triangular trusses combined between each other with a vertical support stand and having upper and lower parallel horizontal longitudinal belts. The lower longitudinal belts rest against front and rear transverse beams and are equipped with guides with eye freely moving along them. The rail track is made in the form of two pairwise end elements resting against rail beams, front ones of which are equipped with vertical support stands. Rail beams are combined to each other with flexible longitudinal traction rods and have spring-loaded wheels and support pads arranged in the lower plane. The mechanism of longitudinal displacement of the device and rail tracks is made in the form of power cylinders, stems of which are hingedly combined with the front transverse beam, and bodies of power cylinders are rigidly fixed on the vertical support stands of rail beams and are hingedly connected with their free ends with eyes. On the front and rear cross beams there are mechanisms of vertical device lifting installed, arranged in the form of power cylinders with stop accessories. The mechanism to lift span blocks comprises drum winches arranged at lower longitudinal belts as synchronised to each other, and their ropes are pulled via bypass blocks installed at upper longitudinal belts and are connected with a polyspast system comprising lower shells of blocks, upper shells of blocks and balancing blocks. Upper shells of blocks are built into the upper frames of the mechanism of longitudinal and transverse displacement of the installed block.

EFFECT: improvement of device operational reliability.

4 cl, 8 dwg