Hollow interlayer steel pipe concrete supporting system and construction method thereof

The invention provides a hollow sandwich steel pipe concrete supporting system and a construction method thereof.The hollow sandwich steel pipe concrete supporting system comprises a hollow sandwich steel pipe concrete supporting assembly, a fixed end and a movable end, and the fixed end is connected to one end of the hollow sandwich steel pipe concrete supporting assembly; the movable end comprises a sand cylinder part, a pushing body part, a sand body and an adjusting bolt, one end of the sand cylinder part is connected with the other end of the hollow interlayer steel pipe concrete supporting assembly, a containing cavity is formed in the sand cylinder part, and the pushing body part is inserted into the containing cavity and slidably arranged in the sand cylinder part; a sand storage space is defined by the body pushing part in the containing cavity, the inner wall of the sand cylinder part and the end, close to the hollow interlayer steel pipe concrete supporting assembly, of the sand cylinder part, a sa