BRIDGE Russian patent published in 1999 - IPC

FIELD: bridge-building industry. SUBSTANCE: bridge has supports with span structure between them. Carriage way is provided on span structure. Also provided are turnable shafts which are interconnected by ropes with tensioning devices. Shafts are secured on supports and are made with spiral recess in the form of single-thread spiral groove. Seated in single-thread spiral groove is endless rope. Spiral recess can be made in the form of multiple-thread spiral groove with endless ropes seated in them. Tensioning device of each rope is made in the form of two pulleys which connect rope between ends of shafts. One of pulleys is installed movably and has adjustable spring. Row of ropes is provided with common removable clamp which connects ropes into single strip. One of shafts can be connected with drive unit for rotation. Application of aforesaid embodiment of bridge allows for unification of design, reduction of amount of materials used, shortening installation period with possible use of standard hoisting facilities both in delivery of span structure components and in erection operations. EFFECT: higher efficiency. 2 cl, 1 dwg