Cast-in-place rapid building construction method for viaduct penetrating building and combined support structure

The invention discloses a cast-in-place rapid building construction method for a viaduct penetrating a building and a combined support structure, and the method comprises the following steps: after constructing a viaduct pier column or a building supporting structure, pre-burying steel plates in a surrounding building supporting foundation layer by layer, and ensuring that the centers of the pre-buried steel plates at the upper layer and the lower layer are on the same vertical axis; the supporting stand columns are hoisted, the centers of the supporting stand columns are aligned with the centers of the embedded steel plates in the supporting foundation, the lower ends of the supporting stand columns are fixedly connected with the embedded steel plates, height adjusting spaces are reserved at the upper ends, and the supporting stand columns are pre-supported layer by layer on floor slabs in floors along with structural construction; mounting a top transfer beam at the top as an upper structure of the cast-in-