Patent ID: 9267286
Filing Date: 2016-02-23
CPC Classification: B28B,E04B,E04C

Claim Text:
1. A hollow-core structure comprising: a plurality of individual inner mold segments that have a hollow cylindrical shell shape; a plurality of individual outer mold segments that have a hollow cylindrical shell shape to correspond to the plurality of individual inner mold segments, and in which the inner mold segments are disposed to be separated; and a filling member that is filled in a separation space between the inner mold and the outer mold, wherein the filling member being layered and a plurality of individual filling members being coupled to each other, the filling member further includes a plurality of non-shrink high-strength mortar layers that are filled between individual filling members, in which stresses on contact surfaces between the individual filling members are evenly distributed, and wherein the filling member further includes shear keys that are interposed at ends of the individual filling members to reinforce a coupling between the individual filling members.