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

FIELD: bridge construction, particularly methods or apparatus specially adapted for erecting or assembling bridges by translational movement of the bridge or bridge sections.

SUBSTANCE: device comprises pushing and braking means, pylon with guy lines fastened to span structure by the first ends thereof, and with flexible ties passing over rollers. The rollers are arranged on head of support, which is the first in span structure protrusion direction and is provided with haulage means. Receiving cantilever is arranged in lower part of the same support. Pylon has shoes arranged in lower part thereof. Guy lines and flexible ties are made as control and haulage block and tackle systems correspondingly. The block and tackle systems have lower blocks secured to pylon shoes by means of hinged clips. Upper blocks of control block and tackle system are secured to span structure bottom. Free cable ends of said block and tackle system are connected to winch installed on span structure. Free ends of cables included in haulage block and tackle system pass through support head rollers and are connected with haulage means made as winch with weight. Pylon is of telescopic type and consists of main and sliding members provided with coaxial orifices and fixers inserted in the orifices. Inclinometer is arranged in area of hinged pylon connection with span structure. Hinged clips are provided with sensors, which determine force in cables of control and haulage block and tackle systems. Device comprises means for span structure end flexure determination and deviation in plane view. Said means is made as target connected to span structure end and sighting device aimed on the target. The sighting device is installed on head of support, which is the first in span structure protrusion direction, and is coaxial to longitudinal bridge axis.

EFFECT: provision of continuous haulage means operation along with convenient pylon length and inclination angle regulation, possibility of continuous guy line and flexible tie tightening force estimation and pylon inclination angle, as well as advancing span structure flexure and deviation in plane view.

4 cl, 2 dwg