The invention discloses a strong roof support
pier column and a method for protecting a section
coal pillar, and belongs to an underground
coal mine roof support method. The strong roof support
pier column is of a cylindrical structure and is composed of a
pier column molding structure comprising an inner bag, an outer bag, a base bag, a
cast iron base, circular steel hoops for increasing the pier column strength, construction bag hanging and fixing hooks, heightening hanging belts, square timber on the upper portion of a construction bag and
filling materials in the bag. A filling port is formed in the outer wall of the upper portion of the construction bag. The
filling materials are concrete added with an accelerating agent and an expanding agent. The invention further provides a constructing method of the strong roof support pier column. The strong roof support pier column is pushed forwards along with a working face when used for section
coal pillar protection, and the strong roof support pier column is constructed behind a working face support. The strong roof support pier column has the advantages of being simple in structure, high in support strength, capable of providing
active support force, good in yielding performance, convenient to construct, free of recycle and the like, is particularly suitable for protecting the section
coal pillar on the goaf side, and can also be used for roof support in other areas of a coal mine.