The utility model provides a supporting plate, , includes vertical H shape component (1), and the outer end is vertical welding in the lower horizontal H of vertical H type component lower extreme and upper end shape component (2) and last horizontal H shape component (3) respectively, and whole frock forms a horizontal u -shaped bayonet, be equipped with otic placode (4) that are used for hoist and mount at last horizontal H shape component (3) top. With the help of the utility model discloses accomplish bridge floor U type rib and assemble in advance, it is not high to the station requirement, only need a workman can accomplish the operation on ordinary frock position. It is controllable to guarantee to add external force in advance with the help of the jack, puies forward high pressure heater working medium volume. The utility model discloses can fall to the intersection between station influence minimumly, can impel or the gradient impels the construction simultaneously, promotes work efficiency by a wide margin.