Small tooth block bridge expansion device convenient to install and position

The utility model discloses a small tooth block bridge expansion device convenient to install and position, which comprises small tooth blocks, the small tooth blocks are dispersed and independent rectangular tooth blocks, gaps are reserved between the rectangular tooth blocks, the end parts of the tooth blocks are subjected to inclined surface treatment, and the tooth blocks are anchored at the beam end on one side of a bridge through fixed end anchoring bolts; rectangular comb teeth are arranged at one end of the cross-seam comb plate, gaps are reserved between the rectangular comb teeth, the end parts of the comb teeth are subjected to inclined surface treatment, and the other end of the cross-seam comb plate is anchored at the other side beam end through a cross-seam end anchor bolt; the rectangular comb teeth of the cross-seam comb plate are inserted into the gaps between the rectangular tooth blocks of the small tooth blocks, and the rectangular tooth blocks of the small tooth blocks are inserted into t