Construction method for prefabricating mortar filled polyvinyl chloride (PVC) tube as inner support for beam side dies

The invention discloses a construction method for prefabricating a mortar filled polyvinyl chloride (PVC) tube as an inner support for beam side dies. The construction method comprises the following steps of: 1) arranging a supporting frame below a beam, and arranging a bottom template of the beam; 2) arranging a side die of the beam, and binding a steel bar for fixing; 3) supporting the mortar filled PVC tube on the inner wall of the side die to form the inner support; 4) arranging another side die of the beam, and fixing the side die with the mortar filled PVC tube; and 5) arranging a keel, reinforcing the beam template, and finishing mounting. Due to the mortar filled PVC tube serving as the inner support of the beam side dies, phenomena of necking, expansion and the like of the beam template are avoided; the beam side dies can be jacked and are tensioned by split bolts and the like; during construction, the beam side dies are difficult to deform; and therefore, the globality and the stability of the beam