The utility model relates to a bridge telescoping device provides a pivot formula and has been used for the multidirectional broach shape bridge telescoping device that shifts, and the turning power of solving current bridge telescoping device existence is poor, the higher problem of manufacturing cost. The utility model discloses an install the fixed tooth plate on the roof beam body and install the movable gear board on another roof beam body, the other end of movable gear board extends to the liang tishang of installation fixed tooth plate, fixed tooth plate and movable gear board be crisscross the distribution each other, movable gear board below is fixed with the U -shaped crab -bolt, the pivot has been put to U -shaped crab -bolt endotheca, the pivot is connected with L shape dowel and straight dowel, the fixed tooth plate is all fixed in roof beam body top by anchor bolt with the movable gear board, the utility model discloses install antivrbration pad and waterproof system simultaneously.