DEVICE FOR BRIDGE SPAN STRUCTURE PROTRUSION Russian patent published in 2007 - IPC E01D21/06 

FIELD: artificial structures, particularly bridges, construction and repair.

SUBSTANCE: span structure protrusion device comprises support with leveling member provided with antifriction surface, load-bearing with friction and antifriction surfaces and reciprocating cylinders connected to the support. Span structure protrusion device also has additional bearing members. The support has window. The bearing members are provided with thrust members, which periodically cooperate with reciprocating cylinders and connected with each other by means of hinges so that closed loop is formed. The closed loop is arranged in antifriction surface of the leveling member and in support window. Device has additional cylinders pivotally connected to support. The bearing members are provided with additional thrust members arranged in staggered order below main cylinders. Friction surface has convexities formed on bearing members. The convexities may have pyramidal shapes. The leveling member is made as spherical support.

EFFECT: provision of continuous span structure movement, decreased time and labor inputs for span structure protrusion along with decreased dynamic load applied thereto.

5 cl, 4 dwg