METHOD TO DISMANTLE T-SHAPED FRAME OF BRIDGE SPAN AND TOP-TROLLEY BEAM FOR REALISATION OF THIS METHOD Russian patent published in 2014 - IPC E01D22/00 

FIELD: construction, road engineering.

SUBSTANCE: method for dismantling of a T-shaped frame in a bridge span formed by box-shaped blocks assembled as hanging over and attached to the support head with bundles of prestressed reinforcement, consists in pre-dismantling of the bridge deck, alternate mounting to the crane and cutting of box-shaped blocks of consoles of the T-shaped frame and their removal from the building site. On consoles of the T-shaped frame they mount standalone mounting rails with crossbars, they anchor one end of the standalone installation of beams on spans and rest it by supports on the top plate of the span. After that they attach end box-shaped blocks of consoles to cross beams, and cut them along the axis of joining with the adjacent box-shaped blocks, and then one of the cut blocks is slung to the crane and removed from the construction site. The vacated standalone mounting beam is moved to the new parking lot, the next box-shaped block is attached to its cross beam, the second cut block is slung to the crane and removed from the construction site, and then the vacated standalone mounting beam is moved to the new parking lot, and the next box-shaped block is attached to the cross beam. The process of dismantling the span continues in a similar manner until it reaches the ends of the standalone mounting axis of the support beams, and then the ends of the standalone mounting beams are combined together to form a single mounting rail, and it is anchored to the support, then the process of dismantling of the span continues the same way. Prior to attachment of the box-shaped blocks to cross beams and cutting of segments of span blocks they strengthen the joints of the span blocks by drilling holes in these joints, introduction of adhesive into their cavities and plugging these holes with metal dowels. The mounting beam for carrying out the method includes a mobile scaffold, a cross beam with rods, an anchor attached to the span and supports. The mounting beam made as composite of two standalone mounting beams, each provided with scaffolds, a crossbeam with rods, an anchor attached to the span and supports, besides, self-mounting rails are combined into a single mounting beam during dismantling of the span when the free ends of the standalone mounting beam reach the axis of the bridge supports. Anchors in the single mounting beam are fixed on the bridge support.

EFFECT: improved design.

4 cl, 6 dwg